Porsche V4 engine
{{Infobox automobile engine
|image=Rennsport Reunion VI (31269554058).jpg
|name=Porsche V4 engine{{Cite web|url=https://newsroom.porsche.com/en/motorsports/porsche-919-hybrid-evo-top-5-series-technical-check-16834.html|title=Technical check: 919 Hybrid Evo|website=Porsche Newsroom}}{{Cite web|url=https://www.supercars.net/blog/porsche-919-hybrid-evo/|title=Porsche 919 Hybrid Evo: Going Faster Than a Formula 1 Car|first=Terence|last=W|date=May 1, 2018}}{{Cite web|url=https://www.racecar-engineering.com/cars/porsche-919/|title=Porsche 919 (9R9-2014)}}
|manufacturer=Porsche
|production=2014-2017{{Cite web|url=https://www.stuttcars.com/porsche-919-hybrid-evo/|title=Porsche 919 Hybrid Evo (2018)|first=Nick|last=Dellis|date=November 29, 2017}}{{Cite web|url=https://www.stuttcars.com/porsche-919-hybrid-2014/|title=Porsche 919 Hybrid (2014)|first=Nick|last=Dellis|date=April 24, 2016}}
|configuration= 90° V4{{Cite web|url=https://www.motorauthority.com/news/1102448_porsche-shows-off-919-hybrids-v-4-engine-for-first-time|title=Porsche Shows Off 919 Hybrid's V-4 Engine For First Time|website=Motor Authority}}
|displacement = {{convert|1994|cc|L|1|order=flip|abbr=on}}
|bore = {{convert|92|mm|2|abbr=on}}
|stroke = {{convert|75|mm|2|abbr=on}}
|valvetrain=16-valve, DOHC, four-valves per cylinder
|power={{convert|500-720|hp|kW|0|lk=on|abbr=on}}{{Cite web|url=https://stuttgartdna.com/porsche-919-hybrid-4-cylinder-engine/|title=Porsche 919 Hybrid 4-cylinder engine|first=Larry|last=Domasin|date=February 22, 2016}}
|torque=
|lubrication=Dry sump
|fuelsystem=Direct fuel injection
|oilsystem=Dry sump
|fueltype=Gasoline
|compression=
|coolingsystem=Water-cooled
|management=Bosch MS5
}}
The Porsche V4 engine is a two-liter, four-stroke, mono-turbocharged, V-4, racing engine, designed, developed, and built by German manufacturer Porsche, for their 919 Hybrid sports car prototype, between 2014 and 2017.{{Cite web|url=https://www.enginelabs.com/news/porsche-unveils-turbo-v4-from-919-hybrid/|title=Porsche Unveils Turbo V4 From 919 Hybrid|first=Mike|last=Magda|date=February 17, 2016|website=EngineLabs}}{{Cite web|url=https://www.carthrottle.com/post/take-a-look-at-the-naked-details-of-the-porsche-919-hybrid-lmp1-car/|title=Take A Look At The Naked Details Of The Porsche 919 Hybrid LMP1 Car|website=Car Throttle}}{{Cite web|url=https://www.evo.co.uk/news/17375/porsche-919-racing-v4-detailed-in-intricate-new-images|title=Porsche 919 racing V4 detailed in intricate new images|website=evo}}{{Cite web|url=https://www.carscoops.com/2016/02/porsche-shows-off-919s-advanced-v4/|title=Porsche Shows Off The 919's Advanced V4 Engine | Carscoops}}
Background
The compact and lightweight engine was a {{Convert|2|l|cuin|spell=in|adj=on}} 90-degree V4 cylinder bank mid-mounted mono-turbocharged petrol engine.{{cite web|url=https://www.automobilemag.com/news/porsche-919-hybrid-and-911-rsr-2014-geneva-show/|title=Porsche 919 and 911 Racecars Shown at Geneva|last=Weiner|first=Eric|date=3 March 2014|work=Automobile|archive-url=https://web.archive.org/web/20181215112109/https://www.automobilemag.com/news/porsche-919-hybrid-and-911-rsr-2014-geneva-show/|archive-date=15 December 2018|url-status=live|access-date=15 December 2018}}{{Cite web|url=http://www.drivingline.com:80/articles/aiming-for-the-top-with-porsches-919-hybrid|title=Aiming for the Top With Porsche's 919 Hybrid|last=Brooks|first=John|date=10 April 2015|publisher=DrivingLine|archive-url=https://web.archive.org/web/20170421154056/http://www.drivingline.com/articles/aiming-for-the-top-with-porsches-919-hybrid|archive-date=21 April 2017|url-status=live|access-date=17 January 2019}} It ran at 9,000 rpm, with performance coming from a direct fuel-injection system and a single Garrett-designed turbocharger with a dual overhead camshaft. It produced approximately {{Convert|500|hp|kW|abbr=on}} and acted as a chassis load-bearing member. Due to the small size of the engine, the transmission casing was fitted to the rear suspension and was almost a third of the car's length. Engine air ingestion was achieved through a carbon-fiber-and-gold thermal wrapped airbox in its center. Front airflow was enabled by louvers along its flank, and a single curved roll-hoop intake was mounted on its roof to feed the carbon-fiber airbox.