Formula One engines#2022–2025

Formula One currently uses 1.6 litre four-stroke turbocharged 90 degree V6 double-overhead camshaft (DOHC) reciprocating engines.{{cite web|author=Fédération Internationale de l’Automobile|title=2014 FORMULA ONE TECHNICAL REGULATIONS|url=http://www.fia.com/sites/default/files/regulation/file/1-2014%20TECHNICAL%20REGULATIONS%202014-01-23.pdf|date=23 January 2014|access-date=27 February 2014|archive-date=27 March 2014|archive-url=https://web.archive.org/web/20140327054505/http://www.fia.com/sites/default/files/regulation/file/1-2014%20TECHNICAL%20REGULATIONS%202014-01-23.pdf|url-status=live}} They were introduced in 2014 and have been developed over the subsequent seasons. Mostly from the 2023 season, specifications on Formula One engines, including the software used to control them and the maximum per-engine price to F1 teams of €15,000,000, have been frozen until the end of 2025, when the completely new 2026 spec will come into effect.

The history of F1 engines has always been a quest for more power, and the enormous power a Formula One engine produces had been generated by operating at a very high rotational speed, reaching over 20,000 revolutions per minute (rpm) during the 2004–2005 seasons. This is because an engine, theoretically, produces double the power when operated twice as fast if combustion (thermal) efficiency and energy loss remain the same. High-revving engines won races no matter how much fuel it consumed and how much wasted heat it generated, as long as they produced more power over the competition. However, with the skyrocketing cost of exotic materials and production methods enabling the high-speed operation, and the realisation that such advancements in technology would likely never applied to production vehicles (because the resultant product is very inefficient), it was decided to limit the maximum rotational speed (rev) to 19,000 rpm in 2007. The maximum rev was further limited to 18,000 rpm in 2009, and to 15,000 rpm for the 2014–2021 seasons.[http://www.formula1.com/inside_f1/understanding_the_sport/5280.html Engine / gearbox] {{webarchive |url=https://web.archive.org/web/20140222043956/http://www.formula1.com/inside_f1/understanding_the_sport/5280.html|date=22 February 2014}} Understanding the Sport, Official Formula 1 Website

Still, the high speed operation of F1 engines contrasts with road car engines of a similar size, which typically operate at less than 6,000 rpm.

Until the mid-1980s Formula One engines were limited to around 12,000 rpm due to the traditional metal springs used to close the valves. The speed required to close the valves at a higher rpm called for ever stiffer springs, which increased the power required to drive the camshaft to open the valves, to the point where the loss nearly offset the power gain through the increase in rpm. They were replaced by pneumatic valve springs introduced by Renault in 1986,{{cite web|url=http://www.scarbsf1.com/Media/Renault_atlasf1-2003-dec17-scarborough.pdf|title=Technically Challenged: Renault Innovations in Formula One|author-last=Scarborough|author-first=Craig|work=Atlas F1|publisher=ScarbsF1.com|archive-url=https://web.archive.org/web/20090824140227/http://www.scarbsf1.com/Media/Renault_atlasf1-2003-dec17-scarborough.pdf|archive-date=24 August 2009|url-status=live|access-date=4 June 2012}}{{cite web|url=http://www.grandprixengines.co.uk/Note_89.pdf|title=Note 89 – TurboCharging background|author-last=Taulbut|author-first=Derek|work=Grand Prix Engine Development 1906 – 2000|publisher=Grandprixengines.co.uk|archive-url=https://web.archive.org/web/20120703145257/http://grandprixengines.co.uk/Note_89.pdf|archive-date=3 July 2012|url-status=live|access-date=4 June 2012}} which inherently have a rising rate (progressive rate) that allowed them to have an extremely high spring rate at larger valve strokes without much increasing the driving power requirements at smaller strokes, thus lowering the overall power loss. Since the 1990s, all Formula One engine manufacturers have used pneumatic valve springs with pressurised air.{{cite web|url=https://www.youtube.com/watch?v=_HwHgEWnpfs|title=F1 Hockenheim 2006 Q2 – Mark Webber Onboard Lap|date=7 July 2011|via=YouTube|access-date=4 January 2015|archive-date=18 December 2015|archive-url=https://web.archive.org/web/20151218074054/https://www.youtube.com/watch?v=_HwHgEWnpfs|url-status=live}}{{cite web|url=https://www.youtube.com/watch?v=BPdm51QwZEw|title=Cosworth V8 at 20,000rpm|date=3 July 2007|via=YouTube|access-date=4 January 2015|archive-date=28 November 2014|archive-url=https://web.archive.org/web/20141128054126/https://www.youtube.com/watch?v=BPdm51QwZEw|url-status=live}}{{cite web|url=https://sportscardigest.com/renault-r26/|title=Renault R26|date=30 April 2009|access-date=27 November 2014}}{{cite web|url=https://www.motorsportmagazine.com/archive/article/april-2007/45/profile-renault-r26|title=Profile – Renault R26|access-date=25 January 2015|date=7 July 2014}}

In addition to the use of pneumatic valve springs, a Formula One engine's high rpm output has been made possible due to advances in metallurgy and design, allowing lighter pistons and connecting rods to withstand the accelerations necessary to attain such high speeds. Improved design also allows narrower connecting rod ends and so narrower main bearings. This permits higher rpm with less bearing-damaging heat build-up. For each stroke, the piston goes from a virtual stop to almost twice the mean speed (approximately 40 m/s), then back to zero. This occurs once for each of the four strokes in the cycle: one Intake (down), one Compression (up), one Power (ignition-down), one Exhaust (up). Maximum piston acceleration occurs at top dead center (TDC) and is in the region of 95,000 m/s², about 9,700 times standard gravity (9,700 G).{{efn|group=1|1=95,000 / 9.807(standard gravity) = 9,686 This means if the reciprocating mass is 100 gram, a conrod must withstand 968.6 kg of pulling force at each TDC at the end of Exhaust stroke. The same force at the end of Compression stroke is counteracted by the compression/combustion pressure, and the pushing (compression, as opposed to pulling) force at BDCs is smaller due to secondary imbalance inherent in piston engines. The current 1.6L V6 engines have 300 gram minimum weight restriction on each piston (with piston pin, pin retainers, and piston rings) and each conrod (with big-end bolts and shell metal bearings on each end). Although no 6 cylinder F1 engine has likely ever run at 20,000rpm, 500 g(gram) reciprocating mass at 9,000 G would result in over 4 tons of force generated 4,000 times each second (20,000 x 2 x 6 / 60 = 4,000. Each occurrence about 0.1 millisecond or less in duration). These pulling and pushing forces "need to be" generated by the engine at the expense of lower net power.(WP:CALC)}}

To lower the maximum piston/conrod acceleration, Formula One cars use short-stroke, multi-cylinder engines that result in lower average piston speed for a given displacement.{{cite web|url=http://auto.howstuffworks.com/question381.htm|title=Why do big diesel engines and race car engines have such different horsepower ratings?|date=16 May 2000|publisher=HowStuffWorks|access-date=2 April 2014|archive-date=29 March 2014|archive-url=https://web.archive.org/web/20140329053641/http://auto.howstuffworks.com/question381.htm|url-status=live}} After seeing some 16 cylinder engines,{{efn|group=1|BRM Type 15, Coventry Climax FWMW and BRM P75}} the number of cylinders was limited to twelve in 1989, ten in 2000, eight in 2006 and six in 2014. These regulation changes made higher-speed designs more difficult and less efficient. To operate at high engine speeds under such limits, the stroke must be short to prevent catastrophic failure, usually from the connecting rod, which is under very large stresses. Having a short stroke means a relatively large bore is required to reach a given displacement. This results in less efficient combustion, due mostly to flame-front propagation having to travel the long distance (for a volume) of ever thinner disk (larger diameter with less height) -shaped combustion chamber deviating far away from the ideal sphere shape with the tip of spark plug at its center.{{cite book|chapter-url=https://saemobilus.sae.org/content/2017-01-0580/|chapter=Dilute Combustion Assessment in Large Bore, Low Speed Engines|date=October 2021|doi=10.4271/2017-01-0580|access-date=12 October 2021|archive-date=27 October 2021|archive-url=https://web.archive.org/web/20211027182513/https://saemobilus.sae.org/content/2017-01-0580/|url-status=live|title=SAE Technical Paper Series|author-last1=Abidin|author-first1=Zainal|author-last2=Hoag|author-first2=Kevin|author-last3=Badain|author-first3=Nicholas|volume=1}}

 Notes:{{notelist|group=1}}

Due to the higher speed operation and the tighter restriction on the number of cylinders, efficiency of a naturally aspirated Formula One engine did not improve much since the 1967 Ford Cosworth DFV and the mean effective pressure stayed at around 14 bar (1.4 MPa) for a long time.[http://www.pureluckdesign.com/ferrari/f1engine/ F1 Engine Power Secrets] {{Webarchive|url=https://web.archive.org/web/20051129094238/http://www.pureluckdesign.com/ferrari/f1engine/|date=29 November 2005}}, Ian Bamsey, June 2000 RACER magazine

From the 2014 season, a new concept of limiting the maximum fuel flow rate was introduced, which limits the power if energy loss and air/fuel ratio are constant. While the bore and stroke figures are now fixed by the rules, this regulation promoted the competition to improve powertrain efficiency. As energy loss increases nearly exponentially with engine speed, the rev limit became meaningless, so it was lifted in 2022. Currently, F1 engines rev up to about 13,000rpm, while the combustion efficiency has risen to about 40 bar BMEP and beyond, using lean and rapid burn techniques enabling λ>1 (average air/fuel ratio much leaner than 14.7:1 by mass){{cite web|title=F1 Powertrain Combustion Efficiency|url=https://global.honda/en/tech/motorsports/Formula-1/Powertrain_Combustion_Efficiency/|author=Honda Motor Co.|access-date=1 October 2024}} and very high mechanical and effective compression ratios.{{efn|group=2|Compression ratio is a primary determinant of internal-combustion engine efficiency. Current regulation limits mechanical compression ratio to 18:1, but effective compression ratio after turbocharging is not limited. Honda stated the 18:1 ratio was a target far beyond the imagination in 2014, but is "now starting to feel like a real limitation." in 2023. Intake runner-length tuning contributes to raising the effective compression ratio on production vehicles, but Honda says their F1 engines are using the same resonance effect instead to lower the peaks in intake manifold pressure, leaving the work to raise the pressure to the turbocharger. They say this improves anti-knocking properties, enabling a higher boost.}}

In addition, energy recovery systems from exhaust pressure (MGU-Heat) and engine brake (MGU-Kinetic) are allowed to further improve efficiency. MGU-H{{cite web|title=MGU-H|url=https://global.honda/jp/tech/motorsports/Formula-1/Powertrain_MGU-H_MGU-K/images/03.jpg|author=Honda Motor Co.|access-date=10 September 2024}}{{cite web|title=MGU-H|url=https://global.honda/jp/tech/motorsports/Formula-1/Powertrain_MGU-H_MGU-K/images/04.jpg|author=Honda Motor Co.|access-date=10 September 2024}} is an electric motor/generator on the common shaft between the exhaust turbine and intake compressor of the turbocharger, while MGU-K{{cite web|title=MGU-K|url=https://global.honda/jp/tech/motorsports/Formula-1/Powertrain_MGU-H_MGU-K/images/07.jpg|author=Honda Motor Co.|access-date=10 September 2024}} is also an electric motor/generator driven by (or driving) crankshaft at a fixed ratio.

Together with improvements in fuel and these energy recovery systems, F1 engines increased power using the same amount of fuel in recent years. For example, Honda RA621H{{cite web|title=The RA521H|url=https://honda.racing/f1/machines/PU-RA621H|access-date=13 September 2024}} engine of 2021 season generated over {{Convert|100|kW|bhp|lk=out|abbr=on}} more maximum power over RA615H of the 2015 season at the same 100 kg/h fuel flow rate.{{cite web|title=Progression of F1 V6 engines – 2015 to 2022|url=https://global.honda/en/tech/motorsports/Formula-1/Powertrain_V6_power_unit/|author=Honda Motor Co.|access-date=1 October 2024}}

With the hugely improved efficiency of the combustion, mechanicals, software and turbocharger, F1 engines are generating much less heat and noise compared to the levels in 2014,{{efn|group=2|If a turbocharger converts 100% of the energy in engine exhaust into motive power, the exhaust from turbocharger will be at the ambient pressure and temperature, and dead silent. On the same token, if an engine converts 100% of the energy in fuel into power, it must operate silently at the ambient temperature.}} and Stefano Domenicali said the 2026 regulation will impose intentionally louder exhaust sound to please the fans.{{cite web|author-first=Gunaditya|author-last=Tripathi|access-date=22 September 2024|title=F1 boss confirms 2026 engine regulations to bring back much-awaited louder engine noise|date=23 June 2023|url=https://www.sportskeeda.com/f1/f1-boss-confirms-2026-engine-regulations-bring-back-much-awaited-louder-engine-noise}}

 Notes:{{notelist|group=2}}

Formula One engines have come through various regulations, manufacturers, and configurations.{{cite web|title=World Championship Grand Prix engine designations and configurations|author=Leo Breevoort|author2=Dan Moakes|author3=Mattijs Diepraam|date=22 February 2007|publisher=6th Gear|url=http://www.forix.com/8w/6thgear/engines.html|access-date=19 May 2007|archive-date=24 February 2007|archive-url=https://web.archive.org/web/20070224024047/http://www.forix.com/8w/6thgear/engines.html|url-status=live}} It is imperative to understand the distinction among the terms "Grand Prix", "World Championship" and "Formula One" to come to grips with the history.

Car racing in various forms began almost immediately after the invention of the automobile, and many of the first organised car racing events were held in Europe before 1900. There had been the tradition of calling a particular race in an event with the name of the award given to the winner in France and some other countries, as traditional racing events often had multiple races and classes, like Men, Women, 100m, 1500m, breast-stroke, etc. In the case of the car race held in Pau, France in 1900, there were no class divisions, and no prize on record was given to the winner, René de Knyff driving a Panhard et Revassor (2.1L, 4 cylinder engine called the 'Phoenix'{{cite web|title=Daimler "Phoenix" 12 hp racing car, 1899|url=https://mercedes-benz-archive.com/marsClassic/en/instance/ko/Daimler-Phoenix-12-hp-racing-car-1899.xhtml|access-date=26 September 2024}} jointly developed with Gottlieb Daimler in Germany, about 20 hp), who became the commissioner of the CSI later. In 1901, the event was named "Semaine de Pau (Week in Pau)" held at Circuit du Sud-Ouest, and the prizes awarded to the winners were "Grand Prix de Pau (Grand Prize of Pau)" for the "650 kg or heavier" class, "Grand Prix du Palais d'Hiver (Grand Prize of the Winter Palace)" for "400 – 650 kg" class, and "Second Grand Prix du Palais d'Hiver" for the "under 400 kg" class. This event is significant not only because it called the prizes Grand Prix, but also because it was one of the very first automobile race events, including the fastest class of cars, held on a closed circuit (the 1900 race was on an open road).

File:Ferrari 125 F1 engine.jpg of 1950]]

File:Alfetta 159 engine.jpg 1.5L supercharged straight-8 engine of 1951 could produce up to {{cvt|425|bhp}}.]]

During and after World War I (1914–1918), it became obvious that the size of engines (and if they were supercharged), not the size and weight of cars, primarily determined how fast they could run. Also, wealthy people started enjoying racing the smaller and more evenly-matched Voiturette cars more than the no-limits "Voiture" 5-11L (mostly 4-cylinder) behemoths that contested the fastest class. In 1926, then-current Voiturette regulation of "up to 1,500 cc, supercharged" was adopted to the formerly-unlimited Voiture class of Grand Prix races in France, and Voiturette class was re-defined as "up to 1,100 cc, no supercharger".

Formula One was born as the first internationally unified regulation to define a class of racing cars in 1946 to be effective 1947. It was defined by Commission Sportive Internationale (CSI), the sporting branch of Fédération Internationale de l'Automobile (FIA), reflecting the Voiture regulation of "up to 1,500 cc supercharged, or 4,500 cc without supercharger". After Formula One was more or less 'ratified' or accepted by other countries, Formula Two was defined in 1947 as "up to 500 cc supercharged, or 2,000 cc without".{{cite web|title=When Formula 2 ruled the world|url=https://formulascout.com/when-formula-2-ruled-the-world/111208|website=Formula Scout|author-last=Gascoigne|author-first=Roger|date=13 September 2023|access-date=26 September 2024}}

In contrast to the pre-existed European Drivers' Championship,{{notetag|Organized and run by Association Internationale des Automobile Clubs Reconnus (AIACR), the forerunner to the FIA, from 1931 to 1939.}} Formula One events were meant to be competition among the countries. Each car, or team, represented a country in this 'international' race, with the cars painted in the "national colours", like red for Italy, green for the UK, silver for Germany, and blue for France. The World Championship for Drivers was defined by the CSI in 1949 for 1950 and onwards to honour the drivers, instead of the countries they represented.{{cite web|title=The beginner's guide to the F1 Drivers' Championship|url=https://www.formula1.com/en/latest/article/the-beginners-guide-to-the-f1-drivers-championship.53MjXJzTDxQnfxfoCLnxNZ|access-date=26 September 2024}} The World Championship for Constructors started in 1958,{{cite web|title=The beginner's guide to the F1 Constructors' Championship|url=https://www.formula1.com/en/latest/article/the-beginners-guide-to-the-f1-constructors-championship.66nTfWSqrUYv3bnbosPkHV|access-date=26 September 2024}} created partly to resolve the then-common dispute between a winning driver and his team on the ownership of the Grand Prix trophy. These championships had a longer-term effect of downplaying the country representation.

Over the years, Formula One added more and more regulations, not only on engines but chassis, tyres, fuel, inspections, championship points, penalties, safety measures, cost control, licensing, distribution of profits, how the qualifying and races must be governed and run, etc., etc. Today, the vast regulations on Power Unit are a very small part of what defines Formula One, which regulates even the number of Summer vacation days the constructor factories must observe.

This era used pre-war voiturette engine regulations, with 4.5 L atmospheric and 1.5 L supercharged engines. The Indianapolis 500 (which was a round of the World Drivers' Championship from 1950 onwards) used pre-war Grand Prix regulations, with 4.5 L atmospheric and 3.0 L supercharged engines. The power range was up to {{Convert|425|hp|kW|0|abbr=on}}, though the BRM Type 15 of 1953 reportedly achieved {{Convert|600|hp|kW|0|abbr=on}} with a 1.5 L supercharged engine.

In 1952 and 1953, the World Drivers' Championship was run to Formula Two regulations, but the existing Formula One regulations remained in force and a number of Formula One races were still held in those years.

File:Lancia - Ferrari D50 engine.JPG

Naturally-aspirated engine size was reduced to 2.5 L and supercharged cars were limited to 750 cc. No constructor built a supercharged engine for the World Championship. The Indianapolis 500 continued to use old pre-war regulations. The power range was up to {{Convert|290|hp|kW|0|abbr=on}}.

File:Porsche 804 cooling-fan.jpg had a fan to cool the air-cooled flat-8 engine]]

Introduced in 1961 amidst some criticism, the new reduced engine 1.5 L formula took control of F1 just as every team and manufacturer switched from front to mid-engined cars. Although these were initially underpowered, by 1965 average power had increased by nearly 50% and lap times were faster than in 1960. The old 2.5 L formula had been retained for International Formula racing, but this did not achieve much success until the introduction of the Tasman Series in Australia and New Zealand during the winter season, leaving the 1.5 L cars as the fastest single seaters in Europe during this time. The power range was between {{Convert|150|hp|kW|0|abbr=on}} and {{Convert|225|hp|kW|0|abbr=on}}.

File:BRM H16 engine.jpg H16, 64-valve, Formula One engine]]

File:Circa 1980 Cosworth DFV at Rahmi M. Koç Müzesi.jpg 3-litre V8 Formula One engine]]

File:Renault F1 turbo engine in a Lotus 95T John Player Special.jpg

In 1966, with sports cars capable of outrunning Formula One cars thanks to much larger and more powerful engines, the FIA increased engine capacity to 3.0 L atmospheric and 1.5 L compressed engines.{{Cite web|url=http://8w.forix.com/gurney-weslake-grandprix-engine.html|title=8W – What? – Eagle Gurney-Weslake|website=8w.forix.com|access-date=15 November 2021|archive-date=26 October 2021|archive-url=https://web.archive.org/web/20211026042415/http://8w.forix.com/gurney-weslake-grandprix-engine.html|url-status=live}} Although a few manufacturers had been aiming for larger engines, the transition was not smooth and 1966 was a transitional year, with 2.0 L versions of the BRM and Coventry-Climax V8 engines being used by several entrants. The appearance of the standard-produced Cosworth DFV in 1967 made it possible for small manufacturers to join the series with a chassis designed in-house. Compression devices were allowed for the first time since 1960, but it was not until 1977 that a company actually had the finance and interest of building one, when Renault debuted their new Gordini V6 turbocharged engine at that year's British Grand Prix at Silverstone. This engine had a considerable power advantage over the naturally-aspirated Cosworth DFV, Ferrari and Alfa Romeo engines.

By the start of the 1980s, Renault had proved that turbocharging was the way to go in order to stay competitive in Formula One, particularly at high-altitude circuits like Kyalami in South Africa and Interlagos in Brazil. Ferrari introduced their all-new V6 turbocharged engine in 1981, before Brabham owner Bernie Ecclestone managed to persuade BMW to manufacture straight-4 turbos for his team from 1982 onwards. In 1983, Alfa Romeo introduced a V8 turbo, and by the end of that year Honda and Porsche had introduced their own V6 turbos (the latter badged as TAG in deference to the company that provided the funding). Cosworth and the Italian Motori Moderni concern also manufactured V6 turbos during the 1980s, while Hart Racing Engines manufactured their own straight-4 turbo.

By mid-1985, every Formula One car was running with a turbocharged engine. In 1986, power figures were reaching unprecedented levels, with all engines reaching over {{cvt|1000|hp}} during qualifying with unrestricted turbo boost pressures. This was especially seen with the BMW straight-4 turbo, the M12/13, which produced around {{Convert|1,400-1,500|hp|kW|-1|abbr=on}} at 5.5 bar of boost in qualifying trim, but was detuned to produce between {{Convert|850-900|hp|kW|-1|abbr=on}} in race spec. However, these engines and gearboxes were very unreliable because of the engine's immense power, and would only last about four laps. For the race, the turbocharger's boost was restricted to ensure engine reliability; but the engines still produced {{cvt|850|-|1000|hp}} during the race.

The power range from 1966 to 1986 was between {{Convert|285|hp|kW|-1|abbr=on}} to {{Convert|500|hp|kW|-1|abbr=on}}, turbos {{Convert|500|hp|kW|-1|abbr=on}} to {{Convert|900|hp|kW|-1|abbr=on}} in race trim, and in qualifying, up to {{Convert|1400|hp|kW|-1|abbr=on}}. Following their experiences at Indianapolis, in 1971 Lotus made a few unsuccessful experiments with a Pratt & Whitney turbine fitted to chassis which also had four-wheel-drive.{{cite web|url=https://f1chronicle.com/how-a-formula-1-internal-combustion-engine-works/|title=How A Formula 1 Internal Combustion Engine Works|website=f1chronicle.com|date=26 August 2019|access-date=21 September 2020|archive-date=22 September 2020|archive-url=https://web.archive.org/web/20200922205140/https://f1chronicle.com/how-a-formula-1-internal-combustion-engine-works/|url-status=live}}

Following the turbo domination, forced induction was allowed for two seasons before its eventual ban in 1989. The FIA regulations limited boost pressure, to 4 bar in qualifying in 1987 for 1.5 L turbo; and allowed a larger 3.5 L formula. Fuel tank sizes were further reduced in size to 150 litres for turbo cars to limit the amount of boost used in a race. These seasons were still dominated by turbocharged engines, the Honda RA167E V6 supplying Nelson Piquet winning the 1987 Formula One season on a Williams also winning the constructors championship, followed by TAG-Porsche P01 V6 in McLaren then Honda again with the previous RA166E for Lotus then Ferrari's own 033D V6.

File:Honda RA168E engine rear Honda Collection Hall.jpg RA168E turbocharged V6 engine]]

The rest of the grid was powered by the Ford GBA V6 turbo in Benetton, with the only naturally-aspirated engine, the DFV-derived Ford-Cosworth DFZ 3.5 L V8 outputting {{Convert|575|hp|kW|0|abbr=on}} in Tyrrell, Lola, AGS, March and Coloni.{{cite web|url=http://www.statsf1.com/en/moteurs.aspx|title=STATS F1 Engines|publisher=StatsF1|access-date=9 September 2010|archive-date=31 August 2010|archive-url=https://web.archive.org/web/20100831234750/http://www.statsf1.com/en/moteurs.aspx|url-status=live}} The massively powerful BMW M12/13 inline-four found in the Brabham BT55 tilted almost horizontally, and in upright position under the Megatron brand in Arrows and Ligier, producing {{convert|900|bhp|kW|-1|abbr=on}} at 3.8 bar in race trim, and an incredible {{convert|1,400-1,500|bhp|kW|-1|abbr=on}} at 5.5 bar of boost in qualifying spec.{{cite web|url=http://www.gurneyflap.com/engine.html|title=BMW Turbo F1 Engine|author=Remi Humbert|publisher=Gurneyflap|access-date=19 May 2007|archive-date=8 June 2007|archive-url=https://web.archive.org/web/20070608033014/http://gurneyflap.com/engine.html|url-status=live}} Zakspeed was building its own turbo inline-four, Alfa Romeo was to power the Ligiers with an inline-four but the deal fell through after initial testing had been carried out. Alfa was still represented by its old 890T V8 used by Osella, and Minardi was powered by a Motori Moderni V6.

In {{F1|1988}}, six teams – McLaren, Ferrari, Lotus, Arrows, Osella and Zakspeed – continued with turbocharged engines, now limited to 2.5 bar. Honda's V6 turbo, the RA168E, which produced {{Convert|685|hp|kW|0|abbr=on}} at 12,300 rpm in qualifying,{{cite web|title=Honda Racing Gallery F1 第二期 McLaren Honda MP4/4|url=http://www.honda.co.jp/Racing/gallery/1988/01/|website=Honda公式ホームページ|language=ja|access-date=22 June 2021|archive-date=27 June 2021|archive-url=https://web.archive.org/web/20210627235510/https://www.honda.co.jp/Racing/gallery/1988/01/|url-status=live}} powered the McLaren MP4/4 with which Ayrton Senna and Alain Prost won fifteen of the sixteen races between them. The Italian Grand Prix was won by Gerhard Berger in the Ferrari F1/87/88C, powered by the team's own V6 turbo, the 033E, with about {{Convert|720|hp|kW|0|abbr=on}} at 12,000 rpm in qualifying and {{Convert|620|hp|kW|0|abbr=on}} at 12,000 rpm in races.{{cite web|title=Ferrari F1-8788C (1988)|url=https://www.ferrari.com/en-EN/formula1/f1-8788c|website=ferrari.com|language=en|access-date=22 June 2021|archive-date=24 June 2021|archive-url=https://web.archive.org/web/20210624203236/https://www.ferrari.com/en-EN/formula1/f1-8788c|url-status=live}} The Honda turbo also powered Lotus's 100T, while Arrows continued with the Megatron-badged BMW turbo, Osella continued with the Alfa Romeo V8 (now badged as an Osella) and Zakspeed continued with their own straight-4 turbo. All the other teams used naturally aspirated 3.5 L V8 engines: Benetton used the Cosworth DFR, which produced {{Convert|585|hp|kW|0|abbr=on}} at 11,000 rpm;{{cite web|title=Engine Ford Cosworth • STATS F1|url=https://www.statsf1.com/en/moteur-ford-cosworth.aspx|website=statsf1.com|access-date=22 June 2021|archive-date=28 June 2021|archive-url=https://web.archive.org/web/20210628011055/https://www.statsf1.com/en/moteur-ford-cosworth.aspx|url-status=live}} Williams, March and Ligier used the Judd CV, producing {{Convert|600|hp|kW|0|abbr=on}};{{cite web|title=Engine Judd • STATS F1|url=https://www.statsf1.com/en/moteur-judd.aspx|website=statsf1.com|access-date=22 June 2021|archive-date=27 June 2021|archive-url=https://web.archive.org/web/20210627220201/https://www.statsf1.com/en/moteur-judd.aspx|url-status=live}} and the rest of the grid used the previous year's {{Convert|575|hp|kW|0|abbr=on}} Cosworth DFZ.

File:Paris - Retromobile 2012 - Renault moteur F1 V10 - 001.jpg RS2 V10 engine]]

Turbochargers were banned from the 1989 Formula One season, leaving only a naturally aspirated 3.5 L formula. Honda was still dominant with their RA109E 72° V10 giving {{Convert|685|hp|kW|0|abbr=on}} @ 13,500 rpm on McLaren cars, enabling Prost to win the championship in front of his teammate Senna. Behind were the Renault RS1-powered Williams, a 67° V10 giving {{Convert|650|hp|kW|0|abbr=on}} @ 12,500 rpm and the Ferrari with its 035/5 65° V12 giving {{Convert|660|hp|kW|0|abbr=on}} at 13,000 rpm. Behind, the grid was powered mainly by Ford Cosworth DFR V8 giving {{Convert|620|hp|kW|0|abbr=on}} @ 10,750 rpm except for a few Judd CV V8 in Lotus, Brabham and EuroBrun cars, and two oddballs: the {{Convert|620|hp|kW|-1|abbr=on}} Lamborghini 3512 80° V12 powering Lola, and the {{Convert|560|hp|kW|-1|abbr=on}} Yamaha OX88 75° V8 in Zakspeed cars. Ford started to try its new design, the 75° V8 HBA1 with Benetton.

File:W12 Engine.jpg car]]

The 1990 Formula One season was again dominated by Honda in McLarens with the {{Convert|690|hp|kW|0|abbr=on}} @ 13,500 rpm RA100E powering Ayrton Senna and Gerhard Berger ahead of the {{Convert|680|hp|kW|0|abbr=on}} @ 12,750 rpm Ferrari Tipo 036 of Alain Prost and Nigel Mansell. Behind them the Ford HBA4 for Benetton and Renault RS2 for Williams with {{Convert|660|hp|kW|0|abbr=on}} @ 12,800 rpm were leading the pack powered by Ford DFR and Judd CV engines. The exceptions were the Lamborghini 3512 in Lola and Lotus, and the new Judd EV 76° V8 giving {{Convert|640|hp|kW|0|abbr=on}} @ 12,500 rpm in Leyton House and Brabham cars. The two new contenders were the Life which built for themselves an F35 W12 with three four cylinders banks @ 60°, and Subaru giving Coloni a 1235 flat-12 from Motori Moderni

File:Honda RA121E engine Honda Collection Hall.jpg RA121E V12 engine]]

Honda was still leading the 1991 Formula One season in Senna's McLaren with the {{Convert|725-780|hp|kW|0|abbr=on}} @ 13,500–14,500 rpm 60° V12 RA121E, just ahead of the Renault RS3 powered Williams benefiting from {{Convert|700-750|hp|kW|-1|abbr=on}} @ 12,500–13,000 rpm. Ferrari was behind with its Tipo 037, a new 65° V12 giving {{Convert|710|hp|kW|0|abbr=on}} @ 13,800 rpm also powering Minardi, just ahead the Ford HBA4/5/6 in Benetton and Jordan cars. Behind, Tyrrell was using the previous Honda RA109E, Judd introduced its new GV with Dallara leaving the previous EV to Lotus, Yamaha were giving its {{Convert|660|hp|kW|0|abbr=on}} OX99 70° V12 to Brabham, Lamborghini engines were used by Modena and Ligier. Ilmor introduced its LH10, a {{Convert|680|hp|kW|0|abbr=on}} @ 13,000 rpm V10 which eventually became the Mercedes with Leyton House and Porsche sourced a little successful 3512 V12 to Footwork Arrows; the rest of the field was Ford DFR powered.{{cite web|title=Natural Aspirations|url=https://www.racecar-engineering.com/news/natural-aspirations/|author-first=Racecar|author-last=Engineering|date=25 June 2020|access-date=14 November 2021|archive-date=14 November 2021|archive-url=https://web.archive.org/web/20211114080021/https://www.racecar-engineering.com/news/natural-aspirations/|url-status=live}}

In 1992, the Renault engines became dominant, even more so following the departure from the sport of Honda at the end of 1992. The 3.5 L Renault V10 engines powering the Williams F1 team produced a power output between {{Convert|750-820|bhp|kW PS|0|abbr=on}} @ 13,000–14,300 rpm toward the end of the 3.5 L naturally-aspirated era, between 1992 and 1994. Renault-engined cars won the last three consecutive world constructors' championships of the 3.5 L formula era with Williams (1992–1994).{{cite web|url=https://www.grandprixengines.co.uk/3rd_Naturally-Aspirated_Era_(3NA)_Part_1.pdf|title=3rd Naturally Aspirated Era|access-date=15 November 2021|archive-date=15 November 2021|archive-url=https://web.archive.org/web/20211115235526/https://www.grandprixengines.co.uk/3rd_Naturally-Aspirated_Era_(3NA)_Part_1.pdf|url-status=live}}

The Peugeot A4 V10, used by the McLaren Formula One team in 1994, initially developed {{Convert|700|bhp|kW PS|0|abbr=on}} @ 14,250 rpm. It was later further developed into the A6, which produced even more power, developing {{Convert|760|bhp|kW PS|0|abbr=on}} @ 14,500 rpm.

The EC Zetec-R V8, which powered the championship-winning Benetton team and Michael Schumacher in 1994, produced between {{Convert|730-750|bhp|kW PS|0|abbr=on}} @ 14,500 rpm.{{cite web|url=https://www.statsf1.com/en/moteur-ford-cosworth.aspx|title=Engine Ford Cosworth • STATS F1|access-date=30 April 2021|archive-date=15 April 2021|archive-url=https://web.archive.org/web/20210415053015/https://www.statsf1.com/en/moteur-ford-cosworth.aspx|url-status=live}}

File:Ferrari 412 T1 engine.jpg Tipo 043 3.5 V12 engine; the most powerful 3.5-litre engine in F1 history]]

By the end of the 1994 season, Ferrari's Tipo 043 V12 was putting out around {{Convert|850|hp|kW|0|abbr=on}}{{cite web|url=http://www.scuderia.com/2017/06/01/ferraris-f1-engines-pursuit-power/|title=Ferrari's Most Alluring F1 Engines|date=June 2017|access-date=30 May 2021|archive-date=15 May 2021|archive-url=https://web.archive.org/web/20210515085321/http://www.scuderia.com/2017/06/01/ferraris-f1-engines-pursuit-power/|url-status=live}} @ 15,800 rpm, which is to date the most-powerful naturally-aspirated V12 engine ever used in Formula One. This was also the most powerful engine of 3.5-litre engine regulation era, before a reduction in engine capacity to 3 litres in 1995.{{cite web|url=http://atlasf1.autosport.com/98/preseason/raman.html|title=A Genius Named Todt|publisher=Atlasf1.autosport.com|access-date=13 February 2011|archive-date=30 March 2012|archive-url=https://web.archive.org/web/20120330023718/http://atlasf1.autosport.com/98/preseason/raman.html|url-status=live}}

File:Ferrari V12 Formula One racing engine.jpg

File:Ferrari 054 V10 engine.jpg model 053 V10 engine of the Ferrari F2004]]

This era used a 3.0 L formula, with the power range varying (depending on engine tuning) between {{Convert|600|hp|kW|0|abbr=on}} and {{Convert|1,000|hp|kW|0|abbr=on}}, between 13,000 rpm and 20,000 rpm, and from eight to twelve cylinders. Despite engine displacement being reduced from 3.5 L, power figures and RPMs still managed to climb. Renault was the initial dominant engine supplier from 1995 until 1997, winning the first three world championships with Williams and Benetton in this era. The championship-winning 1995 Benetton B195 produced a power output of {{convert|675|hp|kW|1|abbr=on}} @ 15,200 rpm, and the 1996 championship-winning Williams FW18 produced {{convert|700|hp|kW|1|abbr=on}} @ 16,000 rpm; both from a shared Renault RS8 3.0 L V10 engine.{{cite web|url=https://grandprixengines.co.uk/3rd_Naturally-Aspirated_Era_(3NA)_Part_2.pdf|title=3rd Naturally Aspirated Era Part 2|access-date=31 August 2021|archive-date=31 July 2021|archive-url=https://web.archive.org/web/20210731073800/https://www.grandprixengines.co.uk/3rd_Naturally-Aspirated_Era_(3NA)_Part_2.pdf|url-status=live}}{{cite web|url=https://www.statsf1.com/en/moteur-renault.aspx|title=Engine Renault • STATS F1|website=statsf1.com|access-date=24 February 2021|archive-date=13 February 2021|archive-url=https://web.archive.org/web/20210213195319/https://www.statsf1.com/en/moteur-renault.aspx|url-status=live}} The 1997 championship-winning FW19 produced between {{convert|730-760|hp|kW|1|abbr=on}} @ 16,000 rpm, from its Renault RS9B 3.0 L V10. Ferrari's last V12 engine, the Tipo 044/1, was used in {{F1|1995}}. The engine's design was largely influenced by major regulation changes imposed by the FIA after the dreadful events during the year before: the V12 engine was reduced from 3.5 to 3.0 litres. The 3.0-litre engine produced around 700 hp (522 kW) 17,000 rpm in race trim; but was reportedly capable of producing up to 760 hp (567 kW) in its highest state of tune for qualification mode.{{cite web|url=https://silodrome.com/ferrari-3000-044-1-v12-formula-1-engine/|title=For Sale: A Ferrari 3000 (044/1) V12 Formula 1 Engine|date=16 January 2021|access-date=3 March 2022|archive-date=15 June 2021|archive-url=https://web.archive.org/web/20210615091321/https://silodrome.com/ferrari-3000-044-1-v12-formula-1-engine/|url-status=live}} Between 1995 and 2000, cars using this 3.0 L engine formula, imposed by the FIA, produced a constant power range (depending on engine type and tuning), varying between 600 hp and 815 hp. Most Formula One cars during the {{F1|1997}} season comfortably produced a consistent power output of between {{convert|665-760|hp|kW|1|abbr=on}}, depending on whether a V8 or V10 engine configuration was used.{{cite web|url=https://www.mclaren.com/racing/heritage/cars/1997-formula-1-mclaren-mp4-12/|title=McLaren Racing – Heritage – MP4-12|website=mclaren.com|access-date=19 November 2020|archive-date=29 November 2020|archive-url=https://web.archive.org/web/20201129024015/https://www.mclaren.com/racing/heritage/cars/1997-formula-1-mclaren-mp4-12/|url-status=live}} From 1998 to 2000 it was Mercedes' power that ruled, giving Mika Häkkinen two world championships. The 1999 McLaren MP4/14 produced between 785 and 810 hp @ 17,000 rpm. Ferrari gradually improved their engine. In {{F1|1996}}, they changed from their traditional V12 engine to a smaller and lighter V10 engine. They preferred reliability to power, losing out to Mercedes in terms of outright power initially. Ferrari's first V10 engine, in 1996, produced {{Convert|715|hp|kW|0|abbr=on}} @ 15,550 rpm,{{cite web|url=https://www.ferrari.com/en-EN/history/garage/1996/f310|title=Ferrari F310: Ferrari History|website=ferrari.com|access-date=12 December 2021|archive-date=14 November 2021|archive-url=https://web.archive.org/web/20211114191853/https://www.ferrari.com/en-EN/history/garage/1996/f310|url-status=live}} down on power from their most powerful 3.5 L V12 (in 1994), which produced over {{Convert|830|hp|kW|0|abbr=on}} @ 15,800 rpm, but up on power from their last 3.0 L V12 (in 1995), which produced {{Convert|700|hp|kW|0|abbr=on}} @ 17,000 rpm. At the 1998 Japanese GP, Ferrari's 047D engine spec was said to produce over {{convert|800|bhp|kW|-1|abbr=on}}, and from 2000 onward, they were never short of power or reliability. To keep costs down, the 3.0 L V10 engine configuration was made fully mandatory for all teams in 2000 so that engine builders would not develop and experiment with other configurations.{{cite news|title=WORLD MOTOR SPORT COUNCIL MEETING – JANUARY 15, 2000|publisher=fia.com|date=15 January 2000|url=http://www.fia.com/resources/documents/1661500937__15_01_2000_WMSC.pdf|url-status=dead|archive-url=https://web.archive.org/web/20110603232117/http://www.fia.com/resources/documents/1661500937__15_01_2000_WMSC.pdf|archive-date=3 June 2011|access-date=24 January 2016}} The V10 configuration had been the most popular since the banning of turbocharged engines in 1989, and no other configuration had been used since 1998.

BMW started supplying its engines to Williams from 2000. The engine was very reliable in the first season though slightly short of power compared to Ferrari and Mercedes units. The BMW E41-powered Williams FW22 produced around 810 hp @ 17,500 rpm, during the 2000 season.{{cite web|url=https://www.f1technical.net/f1db/cars/840/williams-fw22|title=Williams FW22|website=f1technical.net|access-date=19 November 2020|archive-date=16 November 2020|archive-url=https://web.archive.org/web/20201116125025/https://www.f1technical.net/f1db/cars/840/williams-fw22|url-status=live}} BMW went straight forward with its engine development. The P81, used during the 2001 season, was able to hit 17,810 rpm. Unfortunately, reliability was a large issue with several blowups during the season.

The BMW P82, the engine used by the BMW WilliamsF1 Team in 2002, had hit a peak speed of 19,050 rpm in its final evolutionary stage. It was also the first engine in the 3.0 litre V10-era to break through the 19,000 rpm wall, during the 2002 Italian Grand Prix's qualifying.{{cite web|url=http://www.f1network.net/main/s107/st66401.htm|title=Williams F1 – BMW P84/85 Engine|publisher=F1network.net|access-date=13 February 2011|archive-date=22 November 2010|archive-url=https://web.archive.org/web/20101122095758/http://www.f1network.net/main/s107/st66401.htm|url-status=live}} BMW's P83 engine used in 2003 season managed an impressive 19,200 rpm and cleared the {{convert|900|bhp|kW|-1|abbr=on}} mark, at around 940 bhp, and weighs less than {{convert|200|lb|kg|0|abbr=on}}.{{cite web|author=Roy McNeill|url=http://www.usautoparts.net/bmw/engines/p83.htm|title=BMW World – Picture of the Week|publisher=Usautoparts.net|date=22 September 2003|access-date=17 October 2007|archive-date=19 December 2007|archive-url=https://web.archive.org/web/20071219232744/http://www.usautoparts.net/bmw/engines/p83.htm|url-status=live}}{{cite web|url=https://www.bmwblog.com/2015/07/25/one-of-the-greatest-engines-in-history-of-formula-1-bmw-v10/|title=One of the greatest engines in history of Formula 1: BMW V10|date=25 July 2015|access-date=9 November 2020}} Honda's RA003E V10 also cleared the {{convert|900|bhp|kW|-1|abbr=on}} mark at the 2003 Canadian Grand Prix.{{cite news|author-last=Jaynes|author-first=Nick|date=2015-07-16|title=BMW Engines in Formula 1's V10 Era|url=https://www.roadandtrack.com/motorsports/a26106/bmw-engines-in-the-v10-era/|access-date=2 April 2021|website=Road & Track|language=en-US|archive-date=11 November 2020|archive-url=https://web.archive.org/web/20201111235844/https://www.roadandtrack.com/motorsports/a26106/bmw-engines-in-the-v10-era/|url-status=live}}

In 2005, the 3.0 L V10 engine permitted no more than 5 valves per cylinder.[http://www.fia.com/resources/documents/1368441606__2005F1TechnicalRegulations.pdf 2005 Formula One technical regulations] {{Webarchive|url=https://web.archive.org/web/20060621040900/http://www.fia.com/resources/documents/1368441606__2005F1TechnicalRegulations.pdf|date=21 June 2006}}. FIA Also, the FIA introduced new regulations limiting each car to one engine per two Grand Prix weekends, putting the emphasis on increased reliability. In spite of this, power outputs continued to rise. Mercedes engines had about {{convert|930|bhp|kW|-1|abbr=on}} in this season. Cosworth, Mercedes, Renault, and Ferrari engines all produced around {{convert|900|bhp|kW|-1|abbr=on}} to {{convert|940|bhp|kW|-1|abbr=on}} @ 19,000 rpm.{{cite web|url=https://www.f1technical.net/forum/viewtopic.php?t=28171|title=Bore and stroke on early 2000,s V10 engines – F1technical.net|website=f1technical.net|access-date=10 October 2021|archive-date=10 October 2021|archive-url=https://web.archive.org/web/20211010003217/https://www.f1technical.net/forum/viewtopic.php?t=28171|url-status=live}} Honda had over {{convert|965|bhp|kW|-1|abbr=on}}.{{cite web|url=https://www.hondarandd.jp/summary.php?sid=23&lang=en|title=Honda R&D Technical Review F1 Special (The Third Era Activities)|website=Honda R&D Research Paper website|access-date=10 November 2020|archive-date=12 November 2020|archive-url=https://web.archive.org/web/20201112015541/https://www.hondarandd.jp/summary.php?sid=23&lang=en|url-status=live}}{{cite web|url=http://www.formula1-dictionary.net/engine_cosworth_story.html|title=Cosworth story|website=formula1-dictionary.net|access-date=16 November 2020|archive-date=18 November 2020|archive-url=https://web.archive.org/web/20201118152743/http://www.formula1-dictionary.net/engine_cosworth_story.html|url-status=live}} The BMW engine made over {{convert|950|bhp|kW|-1|abbr=on}}.{{cite web|url=https://8000vueltas.com/wp-content/uploads/2015/12/Theissen-10-years-of-BMW-F1-engines.pdf|title=10 Years of BMW F1 Engines|access-date=15 April 2016|archive-url=https://web.archive.org/web/20160414001953/https://8000vueltas.com/wp-content/uploads/2015/12/Theissen-10-years-of-BMW-F1-engines.pdf|archive-date=14 April 2016|url-status=live}}{{cite web|url=https://sportlightpro.com/2021/02/26/formula-1-most-iconic-engines-ever-powertrain-ford-cosworth-renault-turbo-bmw-mercedes-amg-hybrid-motor-motors-engine-power-unit-car-cars-motorsport/|title=Formula 1's 5 Most Iconic Engines ever|date=26 February 2021|access-date=28 February 2022|archive-date=4 July 2022|archive-url=https://web.archive.org/web/20220704204849/https://sportlightpro.com/2021/02/26/formula-1-most-iconic-engines-ever-powertrain-ford-cosworth-renault-turbo-bmw-mercedes-amg-hybrid-motor-motors-engine-power-unit-car-cars-motorsport/|url-status=dead}} Toyota engines had over {{convert|1,000|bhp|kW|-1|abbr=on}}, according to Toyota Motorsport's executive Vice President, Yoshiaki Kinoshita.{{cite web|url=https://www.racecar-engineering.com/articles/toyota-rvx-v10-f1-engine/|title=Toyota RVX-V10 F1 Engine|date=13 July 2009|access-date=30 May 2021|archive-date=24 April 2021|archive-url=https://web.archive.org/web/20210424062227/https://www.racecar-engineering.com/articles/toyota-rvx-v10-f1-engine/|url-status=live}} However, for reliability and longevity purposes, this power figure may have been detuned to around {{convert|960|bhp|kW|-1|abbr=on}} for races.{{cite web|url=https://www.f1technical.net/f1db/cars/896/toyota-tf105b|title=Toyota TF105B – F1technical.net|website=f1technical.net|access-date=30 May 2021|archive-date=2 June 2021|archive-url=https://web.archive.org/web/20210602213237/https://www.f1technical.net/f1db/cars/896/toyota-tf105b|url-status=live}}

File:Renault_RS26_engine_2006.jpg RS26 2.4 V8 engine (2006)]]

For 2006, the engines had to be 90° V8 of 2.4 litres maximum capacity with a circular bore of {{convert|98|mm|in|abbr=on}} maximum, which implies a {{convert|39.75|mm|in|abbr=on}} stroke at maximum bore. The engines must have two inlet and two exhaust valves per cylinder, be naturally aspirated and have a {{convert|95|kg|lb|0|abbr=on}} minimum weight. The previous year's engines with a rev-limiter were permitted for 2006 and 2007 for teams who were unable to acquire a V8 engine, with Scuderia Toro Rosso using a Cosworth V10, after Red Bull's takeover of the former Minardi team did not include the new engines.{{cite book|editor-last=Henry|editor-first=Alan|editor-link=Alan Henry|title=AUTOCOURSE 2006–2007|publisher=Crash Media Group|year=2006|pages=82–83|isbn=1-905334-15-X}} The 2006 season saw the highest rev limits in the history of Formula One, at well over 20,000 rpm; before a 19,000 rpm mandatory rev limiter was implemented for all competitors in 2007. Cosworth was able to achieve just over 20,000 rpm with their V8,{{cite web|url=https://www.f1technical.net/features/18858|title=King of Speed: Cosworth's CA 2.4l V8|website=f1technical.net|date=15 October 2013|access-date=1 April 2021|archive-date=28 January 2021|archive-url=https://web.archive.org/web/20210128014715/https://www.f1technical.net/features/18858|url-status=live}} and Renault around 20,500 rpm. Honda did the same; albeit only on the dynamometer.

Pre-cooling air before it enters the cylinders, injection of any substance other than air and fuel into the cylinders, variable-geometry intake and exhaust systems, and variable valve timing were forbidden. Each cylinder could have only one fuel injector and a single plug spark ignition. Separate starting devices were used to start engines in the pits and on the grid. The crankcase and cylinder block had to be made of cast or wrought aluminium alloys. The crankshaft and camshafts had to be made from an iron alloy, pistons from an aluminium alloy, and valves from alloys based on iron, nickel, cobalt or titanium. These restrictions were in place to reduce development costs on the engines.[http://www.fia.com/resources/documents/1603301296__2006_F1_TECHNICAL_REGULATIONS.pdf 2006 Formula One technical regulations] {{webarchive |url=https://web.archive.org/web/20060901003154/http://www.fia.com/resources/documents/1603301296__2006_F1_TECHNICAL_REGULATIONS.pdf |date=1 September 2006 }}, chapter five, 15 December 2005

File:Ferrari_056_engine_(2007)_rear_Museo_Ferrari.jpg 2.4 L V8 engine]]

The reduction in capacity was designed to give a power reduction of around 20% from the three-litre engines, to reduce the increasing speeds of Formula One cars. Despite this, in many cases the performance of the car improved. In 2006 Toyota F1 announced an approximate {{Convert|740|hp|kW|0|abbr=on}} output at 18,000 rpm for its new RVX-06 engine,F1 technical, [http://www.f1technical.net/f1db/cars/897 Toyota TF106 Specification] {{Webarchive|url=https://web.archive.org/web/20090130063047/http://www.f1technical.net/f1db/cars/897 |date=30 January 2009 }}, 14 January 2006 but real figures are of course difficult to obtain. Most cars from this period (2006–2008) produced a regular power output of approximately between 720 and 800 hp @ 19,000 rpm (over 20,000 rpm for the {{F1|2006}} season).{{cite web|url=https://forums.autosport.com/topic/89958-current-engine-ranking/|title=Current Engine Ranking??? – Racing Comments Archive|website=The Autosport Forums|access-date=19 November 2020|archive-date=18 January 2021|archive-url=https://web.archive.org/web/20210118112602/https://forums.autosport.com/topic/89958-current-engine-ranking/|url-status=live}}

The engine specification was frozen in 2007 to keep development costs down. The engines which were used in the 2006 Japanese Grand Prix were used for the 2007 and 2008 seasons and they were limited to 19,000 rpm. In 2009 the limit was reduced to 18,000 rpm with each driver allowed to use a maximum of 8 engines over the season. Any driver needing an additional engine is penalised 10 places on the starting grid for the first race the engine is used. This increases the importance of reliability, although the effect is only seen towards the end of the season. Certain design changes intended to improve engine reliability may be carried out with permission from the FIA. This has led to some engine manufacturers, notably Ferrari and Mercedes, exploiting this ability by making design changes which not only improve reliability but also boost engine power output as a side effect. As the Mercedes engine was proven to be the strongest, re-equalisations of engines were allowed by the FIA to allow other manufacturers to match the power.{{cite web|url=http://www.autosport.com/news/report.php/id/78776|title=F1 News: FIA agrees to engine re-equalisation|work=Autosport.com|publisher=Haymarket Publications|date=22 September 2009|access-date=22 September 2009|archive-date=24 September 2009|archive-url=https://web.archive.org/web/20090924234140/http://www.autosport.com/news/report.php/id/78776|url-status=live}}

2009 saw the exit of Honda from Formula One. The team was acquired by Ross Brawn, creating Brawn GP and the BGP 001. With the absence of the Honda engine, Brawn GP retrofitted the Mercedes engine to the BGP 001 chassis. The newly branded team won both the Constructors' Championship and the Drivers' Championship from better-known and better-established contenders Ferrari, McLaren-Mercedes, and Renault.

Cosworth, absent since the 2006 season, returned in 2010. New teams Lotus Racing, HRT, and Virgin Racing, along with the established Williams, used this engine. The season also saw the withdrawal of the BMW and Toyota engines, as the car companies withdrew from Formula One due to the Great Recession.{{cite web|title=Are there enough engines in F1 in 2010?|url=http://www.grandprix.com/ns/ns21833.html|work=Grandprix.com|publisher=Inside F1|access-date=2 June 2011|archive-date=15 October 2012|archive-url=https://web.archive.org/web/20121015180647/http://www.grandprix.com/ns/ns21833.html|url-status=live}}

In 2009, constructors were allowed to use kinetic energy recovery systems (KERS), also called regenerative brakes. Energy can either be stored as mechanical energy (as in a flywheel) or as electrical energy (as in a battery or supercapacitor), with a maximum power of 81 hp (60 kW; 82 PS) deployed by an electric motor, for a little over 6 seconds per lap. Four teams used it at some point in the season: Ferrari, Renault, BMW, and McLaren.{{cite web|url=https://www.racecar-engineering.com/articles/the-basics-of-f1-kers/|title=The basics of F1 KERS|date=14 April 2009|access-date=14 April 2010}}

Although KERS was still legal in F1 in the 2010 season, all the teams agreed not to use it. KERS returned for the 2011 season, when only three teams elected not to use it. For the 2012 season, only Marussia and HRT raced without KERS, and in 2013 all teams on the grid had KERS. From 2010 to 2013 cars have a regular power of 700–800 hp, averaging around 750 hp @ 18,000 rpm.{{cite web|url=https://www.racecar-engineering.com/articles/f1/f1-2013-the-last-of-the-v8s/|title=F1 2013: The last of the V8's|date=11 October 2013|access-date=24 February 2021|archive-date=11 November 2020|archive-url=https://web.archive.org/web/20201111193143/https://www.racecar-engineering.com/articles/f1/f1-2013-the-last-of-the-v8s/|url-status=live}}{{cite web|url=https://www.auto123.com/en/news/f1-take-a-look-at-whats-inside-a-formula-1-engine/33688/|title=F1: Take a look at what's inside a Formula 1 engine|publisher=Car News, Auto123|date=12 March 2010|access-date=28 March 2010}}

The FIA announced a change from the 2.4-litre V8, introducing 1.6-litre V6 hybrid engines (more than one power source) for the {{f1|2014}} season. The new regulations allow kinetic and heat energy recovery systems.{{cite web|url=http://www.fia.com/en-GB/mediacentre/pressreleases/f1releases/2011/Pages/f1-2014-engine1.aspx|title=FIA Formula One World Championship Power Unit Regulations|date=29 June 2011|publisher=FIA|access-date=30 November 2011|archive-date=8 December 2011|archive-url=https://web.archive.org/web/20111208064506/http://www.fia.com/en-GB/mediacentre/pressreleases/f1releases/2011/Pages/f1-2014-engine1.aspx|url-status=live}} Forced induction was now allowed{{snd}}either turbochargers, which last appeared in {{f1|1988}}, or superchargers{{snd}}with all constructors opting to use a turbocharger. Instead of limiting the boost level, the regulations introduced a fuel flow restriction at 100 kg of petrol per hour maximum. The engines sounded very different from the previous formula, due to the lower rev limit (15,000 rpm) and the turbocharger.

The new formula for turbocharged engines have their efficiency improved through turbo-compounding by recovering energy from exhaust gases.{{cite web|author-last=Allen|author-first=James|title=F1 set for electric only in the pit lane?|url=http://www.jamesallenonf1.com/2011/04/f1-set-for-electric-only-in-the-pit-lane/|work=JamesallenonF1.com|date=20 April 2011|access-date=2 June 2011|archive-date=23 June 2011|archive-url=https://web.archive.org/web/20110623150039/http://www.jamesallenonf1.com/2011/04/f1-set-for-electric-only-in-the-pit-lane/|url-status=live}} The original proposal for four-cylinder turbocharged engines was not welcomed by the racing teams, in particular Ferrari. Adrian Newey stated during the 2011 European Grand Prix that the change to a V6 enables teams to carry the engine as a stressed member, whereas an inline-4 would have required a space frame. A compromise was reached, allowing V6 forced induction engines instead. The engines rarely exceed 12,000 rpm during qualifying and race, due to the new fuel flow restrictions.{{cite web|title=Teams are keeping revs under 12000 rpm|url=http://blog.axisofoversteer.com/2014/03/teams-are-keeping-revs-under-12000-rpm.html|access-date=11 October 2014|archive-date=16 October 2014|archive-url=https://web.archive.org/web/20141016192650/http://blog.axisofoversteer.com/2014/03/teams-are-keeping-revs-under-12000-rpm.html|url-status=live}}

Energy recovery systems such as KERS had a boost of {{cvt|160|hp}} and 2 megajoules per lap. KERS was renamed Motor Generator Unit–Kinetic ({{nowrap|MGU-K}}). Heat energy recovery systems were also allowed, under the name Motor Generator Unit–Heat ({{nowrap|MGU-H}})

The 2015 season was an improvement on 2014, adding about 30–50 hp (20–40 kW) to most engines, the Mercedes engine being the most powerful with 870 hp (649 kW). In 2019, Renault's engine was claimed to have hit 1,000 hp in qualifying trim.{{cite web|url=https://www.auto-motor-und-sport.de/formel-1/motorleistung-f1-2019-renault-1000-ps/|title=Motorleistung der Formel 1 (2019): Renault erreicht die 1.000 PS|author-first=Andreas|author-last=Haupt|date=30 July 2019|website=auto motor und sport|access-date=11 December 2020|archive-date=28 January 2021|archive-url=https://web.archive.org/web/20210128161348/https://www.auto-motor-und-sport.de/formel-1/motorleistung-f1-2019-renault-1000-ps/|url-status=live}}

Of the previous manufacturers, only Mercedes, Ferrari and Renault produced engines to the new formula in 2014, whereas Cosworth stopped supplying engines. Honda returned as an engine manufacturer in 2015, with McLaren switching to Honda power after using the Mercedes engine in 2014. In 2019, Red Bull switched from using a Renault engine to Honda power. Honda supplied both Red Bull and AlphaTauri. Honda withdrew as a power unit supplier at the end of {{f1|2021}}, with Red Bull taking over the project and producing the engine in-house.{{cite web|url=https://www.redbull.com/int-en/redbullracing/red-bull-take-on-honda-f1-pu|title=Red Bull To Take On Honda F1 Power Unit Technology From 2022|website=Red Bull|access-date=16 March 2021|archive-date=1 March 2021|archive-url=https://web.archive.org/web/20210301003515/https://www.redbull.com/int-en/redbullracing/red-bull-take-on-honda-f1-pu|url-status=live}}

In 2017, the FIA began negotiations with existing constructors and potential new manufacturers over the next generation of engines with a projected introduction date of {{F1|2021}} but delayed to {{F1|2022}} due to the effects of the COVID-19 pandemic.{{cite web|url=https://www.autosport.com/f1/news/formula-1s-2021-regulations-whats-new-for-2021-5115288/5115288/|title=Formula 1's 2021 regulations: What's new for 2021?|date=15 January 2021|website=Autosport.com|access-date=13 September 2021|archive-date=13 September 2021|archive-url=https://web.archive.org/web/20210913104046/https://www.autosport.com/f1/news/formula-1s-2021-regulations-whats-new-for-2021-5115288/5115288/|url-status=live}} The initial proposal was designed to simplify engine designs, cut costs, promote new entries and address criticisms directed at the 2014 generation of engines. It called for the 1.6 L V6 configuration to be retained, but abandoned the complex Motor Generator Unit–Heat ({{nowrap|MGU-H}}) system.{{cite web|url=https://www.speedcafe.com/2017/11/01/formula-1-unveils-2021-engine-plans/|title=Formula 1 unveils 2021 engine plans|website=speedcafe.com|date=1 November 2017|access-date=8 September 2020|archive-date=7 November 2017|archive-url=https://web.archive.org/web/20171107131517/https://www.speedcafe.com/2017/11/01/formula-1-unveils-2021-engine-plans/|url-status=live}} The Motor Generator Unit–Kinetic ({{nowrap|MGU-K}}) would be more powerful, with a greater emphasis on driver deployment and a more flexible introduction to allow for tactical use. The proposal also called for the introduction of standardised components and design parameters to make components produced by all manufacturers compatible with one another in a system dubbed "plug in and play". A further proposal to allow four-wheel drive cars was also made, with the front axle driven by an {{nowrap|MGU-K}} unit—as opposed to the traditional driveshaft—that functioned independently of the {{nowrap|MGU-K}} providing power to the rear axle, mirroring the system developed by Porsche for the 919 Hybrid race car.{{cite web|url=https://thejudge13.com/2018/05/08/f1-2021-libertys-4wd-porsche-spec-pus/|title=F1 2021: Liberty's 4WD, Porsche & Spec PU's|date=8 May 2018|website=thejudge13.com|access-date=8 September 2020|archive-date=27 September 2020|archive-url=https://web.archive.org/web/20200927041808/https://thejudge13.com/2018/05/08/f1-2021-libertys-4wd-porsche-spec-pus/|url-status=live}}{{cite web|url=https://www.motorsport.com/f1/news/analysis-why-4wd-is-on-formula-1-s-agenda-970296/1372054/|title=Analysis: Why 4WD is on Formula 1's agenda|website=motorsport.com|date=26 October 2017|author-first=Jonathan|author-last=Noble|access-date=8 September 2020|archive-date=11 November 2020|archive-url=https://web.archive.org/web/20201111210504/https://www.motorsport.com/f1/news/analysis-why-4wd-is-on-formula-1-s-agenda-970296/1372054/|url-status=live}}

However, mostly due to no new engine supplier applying for F1 entry in 2021 and 2022, the abolishment of MGU-H, a more powerful MGU-K and a four-wheel drive system were all shelved with the possibility of their re-introduction for 2026. Instead, the teams and FIA agreed to a radical change in body/chassis aerodynamics to promote more battles on the course at closer distances to each other. They further agreed to an increase in alcohol content from 5.75% to 10% of fuel, and to implement a freeze on power unit design for 2022–2025, with the internal combustion engine (ICE), turbocharger and MGU-H being frozen on 1 March and the energy store, MGU-K and control electronics being frozen on 1 September during the 2022 season.{{cite web|url=https://www.planetf1.com/features/major-changes-f1-2022-season/|title=All the major changes for the F1 2022 season|author=Jamie Woodhouse|date=28 February 2022|access-date=28 February 2023}} Honda, the outgoing engine supplier in 2021, was keen to keep the MGU-H, and Red Bull, who took over the engine production project, backed that opinion.{{cite web|url=https://www.autosport.com/f1/news/f1-manufacturers-push-back-on-2021-engine-proposals-5297298/5297298/|title=F1 manufacturers push back on 2021 engine proposals|date=10 July 2018|author-first=Adam|author-last=Cooper|access-date=10 July 2019}} The 4WD system was planned to be based on Porsche 919 Hybrid system, but Porsche ended up not becoming an F1 engine supplier for 2021–2022.

New engine regulations will be introduced from the 2026 season. These engine regulations will see the turbocharged 1.6 V6 internal combustion engine configuration used since 2014 retained. The new power units will produce over {{Convert|1000|bhp|lk=in|abbr=on}}, although the power will come from different places. The MGU-H (Motor Generator Unit – Heat) will be banned, while the MGU-K's (Motor Generator Unit – Kinetic) output will increase to {{Convert|350|kW|bhp|lk=out|abbr=on|order=flip}} – previously the MGU-K had a maximum power output of {{Convert|120|kW|bhp|lk=out|abbr=on|order=flip}}. The power output of the internal combustion part of the power unit will decrease to {{Convert|400|kW|bhp|lk=out|abbr=on|order=flip}} from {{Convert|850|bhp|lk=in|abbr=on}}. In addition, fuel flow rates will be limited based on theoretical energy available from rule-specified unified composition, rather than mass of the various fuel from different sources. There is also intended to be further restrictions on components such as MGU-Ks and exhausts imposed from 2027. The new power units are due to be run on a fully sustainable fuel, being developed by Formula One.{{cite web|url=https://www.racefans.net/2022/08/16/f1s-2026-power-unit-regulations-approved-by-fias-world-motor-sport-council/|title=F1's 2026 power unit regulations approved by FIA's World Motor Sport Council · RaceFans|date=16 August 2022|access-date=16 August 2023}}{{cite web|date=16 August 2022|title=7 things you need to know about the 2026 F1 engine regulations|url=https://www.formula1.com/en/latest/article/more-efficient-less-fuel-and-carbon-net-zero-7-things-you-need-to-know-about.ZhtzvU3cPCv8QO7jtFxQR|access-date=4 April 2024|website=formula1.com|language=en}}

Audi are due to become an engine provider from 2026 onwards.{{cite web|title=Audi to join Formula 1 from 2026|url=https://www.formula1.com/en/latest/article.breaking-audi-to-join-formula-1-from-2026.yr9pFVd5nSQBbZ7EZZDLJ.html|access-date=26 August 2022|website=formula1.com}} Ford are due to partner with Red Bull Powertrains as Red Bull Ford Powertrains from 2026 after a 20-year absence.{{cite web|date=3 February 2023|title=Ford announce plans to return to F1 from the 2026 season|website=Formula 1.Com|url=https://www.formula1.com/en/latest/article.breaking-ford-announce-plans-to-return-to-f1-from-the-2026-season.4X1AqB0KMIp8iXka9ngPJ8.html|access-date=3 February 2024}}{{cite web|date=3 February 2023|title=Ford announce new technical partnership with Red Bull for 2026 and beyond|website=Formula 1.Com|url=https://www.formula1.com/en/latest/article.breaking-ford-announce-new-technical-partnership-with-red-bull-for-2026-and.177bB2z0b7Iw6C79l1YQ9b.html|access-date=20 February 2023}}{{cite web|title=BREAKING: Ford to partner with Red Bull for the 2026 season and beyond|url=https://twitter.com/F1/status/1621527091425742849|website=Formula 1 Twitter|access-date=20 April 2023}} Honda, under its subsidiary Honda Racing Corporation, has also entered as a manufacturer for 2026 according to the FIA after officially leaving the sport in 2021.{{cite web|author-last=Cooper|author-first=Sam|date=3 February 2023|title=FIA confirm six engine suppliers, including Honda and Ford, signed up for F1 2026|url=https://www.planetf1.com/news/fia-eningw-suppliers-honda-ford-f1-2026/|access-date=3 February 2023|website=PlanetF1}} The FIA also confirmed that Ferrari, Mercedes-AMG and Alpine (Renault) were registered as power unit suppliers for 2026.{{cite web|date=3 February 2023|title=FIA Confirms 2026 Formula 1 Power Unit Supplier Registrations|access-date=20 April 2023|url=https://www.fia.com/news/fia-confirms-2026-formula-1-power-unit-supplier-registrations|website=Federation Internationale de l'Automobile}} However, on 30 September 2024, owing to lack of strong results with its power unit during the V6 turbo-hybrid era since it began in 2014, Renault announced it would be ending its engine programme following the conclusion of the 2025 championship and would not be making engines for the new 2026 regulations after all.{{cite web|url=https://www.the-race.com/formula-1/renault-to-stop-f1-engine-programme-after-2025-mercedes-switch/|title=Renault to end F1 engine programme ahead of Mercedes switch|date=30 September 2024}} A 2025 FIA proposal to end the 2026 engine formula for 2028 and switch to sustainably fuelled naturally aspirated V10 engines was rejected by teams.https://www.skysports.com/f1/news/12040/13346289/bahrain-gp-no-return-of-v10-engines-in-f1-before-2029-after-productive-meeting-between-formula-1-teams-and-fia#:~:text=Formula%201%20will%20not%20return,were%20last%20used%20in%202005.

 Notes:{{notelist|group=era}}

• Manufacturers: Mercedes-Benz, Renault (including TAG Heuer rebadging until 2018), Ferrari and Red Bull Powertrains (Honda)
• Type: Hybrid-powered 4-stroke piston. '4-stroke' may imply Otto-cycle, but it is not required. Atkinson/Miller cycle allowed.
• Configuration: V6 single hybrid turbocharger engine
• V-angle: 90° cylinder angle
• Displacement: {{convert|1.6|L|cuin|0|lk=on|abbr=off}}
• Bore: {{convert|80|mm|in|3|lk=on|abbr=on}}
• Stroke: {{convert|53|mm|in|3|lk=on|abbr=on}}
• Compression ratio: Max 18:1
• Valvetrain: DOHC, 24-valve (four valves per cylinder)
• Fuel: Minimum 87 (RON+MON)/2 unleaded petroleum + at least 10% "advanced sustainable" Ethanol{{efn|group=spec|There are finer composition and property limitations, but improvements within the limits are allowed, provided a sample is submitted and approved by FIA. Honda, for example, requested and Mobil agreed to provide, special formulations with carbon-neutral components suited for lean/rapid-burn techniques.{{cite web|title=Formula 1 Carbon Neutral Fuel|url=https://global.honda/en/tech/motorsports/Formula-1/Powertrain_e-fuel/|author=Honda Motor Co.|access-date=1 October 2024}}}}
• Fuel delivery: Petrol direct injection
• Maximum fuel injection pressure: {{convert|500|bar|MPa|1|lk=on|abbr=on}}
• Number of fuel injectors: Max 1 per cylinder.{{efn|group=spec|This is a severe limitation on stratified charge and sub-chamber{{efn|group=spec|A small chamber around the tip of spark plug within the 15.7 cc{{efn|group=spec|1=1,600 cc / 6 / (18–1) = 15.7 cc}} minimum combustion chamber volume, with holes facing the main chamber.}} ignition used for lean and rapid burn, as separate injectors cannot be used for sub- and main chambers to provide rich and lean gas. The number of injections per cycle is not limited.}}
• Fuel flow rate limit: (0.009 x rpm) + 5.5 up to 100 kg/h {{efn|group=spec|There are further limits under partial-throttle conditions.}}
• Fuel use limit: 110 kg / race
• Aspiration: Single-Turbocharger with in-line electric motor/generator (MGU-H)
• Power output: About {{convert|850|+|161|hp|kW|0|lk=on|abbr=on}} @ 10,500 rpm and higher
• Torque: Approx. {{convert|600|-|815|Nm|lbft|0|lk=on|abbr=on}}{{cite web|url=https://spicerparts.com/calculators/horsepower-torque-calculator|title=Spicer Horsepower and Torque Calculator|access-date=1 August 2024}}
• Lubrication: Dry sump{{efn|group=spec|Oil may not contain fuel octane boosting additives. Oil consumption is limited to Max 0.30L / 100 km. (Fluid level in oil tank is monitored by telemetry)}}
• Maximum revs: Unlimited (in practice, no engine goes much above 12,000 rpm as efficiency declines) {{efn|group=spec|1=This is also a function of MGU-K drive ratio. If a team decides to drive MGU-K at 1:4 (one crank rotation to 4 MGU-K rotations overdrive. Ratio must be fixed.), then the max engine rev becomes 50,000rpm(max speed of MGU-K) / 4 = 12,500rpm. This ratio is normally dictated by the engine supplier.}}
• Engine management: FIA Standard ECU {{efn|group=spec|ECU (Electronic Control Unit) controls energy recovery and other chassis control / telemetry functions as well. Power unit control part of the ECU evolved from McLaren TAG-320B of 2019. Most parts of the program to operate the ECU were free to be improved as long as their copies (versions) submitted, registered and approved by FIA (there were limitations on the number of versions in a season), but Power Unit control part of the program is frozen mostly from 2022 to 2025 seasons.}}
• Max. speed: Approximately {{convert|370|km/h|mph|0|lk=on|abbr=on}} (Monza, Baku and Mexico); {{convert|340|km/h|mph|0|lk=on|abbr=on}} normal tracks
• Mass: Minimum {{convert|150|kg|lb|2|lk=on|abbr=on}} complete
• Cooling: Single water pump
• Ignition: No more than 5 sparks per cycle
• Exhaust systems: Single exhaust with central exit

• Turbocharger mass: {{Convert|8|kg|lb|1|lk=on|abbr=on}} depending on the turbine housing used
• Turbocharger rev limit: 125,000 rpm
• Pressure charging: Single-stage compressor and exhaust turbine, common-shaft with MGU-H
• Turbo boost pressure: Unlimited but typically {{cvt|400|-|500|kPa|bar|}} absolute
• Wastegate: Maximum of two pop-off and two wastegate valves,{{efn|group=spec|Pop-off valves limit the intake pressure by recirculating the charge. Wastegate valves release excess pressure to the atmosphere.}} electronic- or pneumatic-controlled

• MGU-K RPM: Max 50,000 rpm, fixed driven/drive ratio by/to the crankshaft
• MGU-K power: Max {{convert|120|kW|bhp|lk=out|abbr=on}}
• Energy recovered by MGU-K: Max {{convert|2|MJ|kWh|lk=out|abbr=on}} / lap
• Energy received by MGU-K: Max {{convert|4|MJ|kWh|lk=out|abbr=on}} / lap from Energy Store,{{efn|group=spec|name=ES|A combination of high voltage Lithium-ion battery with a series of Super Capacitors acting as the buffer for high charge/discharge current. Max Voltage: 1000V, Weight limit: Minimum 20 kg. Maximum 25 kg.}} unlimited from MGU-H{{efn|group=spec|name=MGUH|Due to these rules, the turbocharger is often used not to increase intake pressure (i.e. with pop-off valve open), but to drive MGU-H which provides electricity so that MGU-K output is pegged at 120kW for maximum acceleration regardless of the engine speed.}}
• MGU-H RPM: Same as the turbocharger speed. Max 125,000 rpm
• Energy recovered by MGU-H: Unlimited{{efn|group=spec|name=MGUH}}
• Energy released by MGU-H to drive the turbocharger or MGU-K:{{efn|group=spec|MGU-H generates electricity, which is used to charge the battery (Energy Store{{efn|group=spec|name=ES}}) and/or to drive MGU-K; or, it consumes electricity to accelerate the turbocharger.}} Unlimited{{efn|group=spec|name=MGUH}}

 Notes: {{notelist|group=spec}}

Figures correct as of the 2025 Bahrain Grand Prix

Bold indicates engine manufacturers that have competed in Formula One in the 2025 season.

{{portal|Formula One}}

• List of Formula One engine manufacturers

{{notefoot}}

{{notelist}}

{{Reflist}}

{{commons}}

• {{cite web|title=FIA 2024 Formula 1 Technical Regulations – Issue 6 – 2024-04-30|url=https://www.fia.com/sites/default/files/fia_2024_formula_1_technical_regulations_-_2024-04-30.pdf|access-date=11 September 2024}}
• [http://www.f1technical.net/articles/4 Formula One Engines] In-depth article covering facts, evolution and tech specs of F1 engines 2009
• [https://web.archive.org/web/20081106195349/http://www.racecar-engineering.com/articles/f1/273555/inside-an-f1-engine.html Racecar Engineering] F1 Engines

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