BMW N74

{{Infobox automobile engine

|name =BMW N74 engine

|image =2017-09-12 IAA 2017 BMW by Olaf Kosinsky-59.jpg

|caption =Model of an N74

|production =2009–present

|configuration=60° V12

|predecessor =BMW N73

|valvetrain =DOHC with VVT

|displacement ={{convert|5972|cc|L|1|order=flip|abbr=on}} (2009–2015)
{{convert|6592|cc|L|1|order=flip|abbr=on}} (2009–2022)
{{convert|6749|cc|L|1|order=flip|abbr=on}}

| bore = {{convert|89|mm|2|abbr=on}}

| stroke = {{convert|80|mm|2|abbr=on}}
{{convert|88.3|mm|2|abbr=on}}
{{convert|90.4|mm|2|abbr=on}}

|block = Aluminium

|head = Aluminium

|fueltype =Petrol

|turbocharger =Twin-turbo

|power ={{convert|536-624|hp|kW|0|order=flip|abbr=on}}

|torque ={{convert|553-664|lbft|Nm|0|order=flip|abbr=on}}

}}

File:2017-09-12 IAA 2017 BMW by Olaf Kosinsky-61.jpg

The BMW N74 is a twin-turbo V12 petrol engine which replaced the N73 and has been produced since 2008. It is BMW's first turbocharged V12 engine and is also used in several Rolls-Royce models.

Design

The N74 features twin turbochargers, which are not present on its naturally aspirated BMW N73 predecessor. The turbochargers are located on the outside of the engine and use a boost pressure of {{convert|11.6|psi|bar|1|abbr=on}}. In its base configuration the engine has a compression ratio of 10:1 and a specific fuel consumption of 245 g·kW⁻¹·h⁻¹.

Like its predecessor, the N74 has direct injection, DOHC and variable valve timing (called double-VANOS by BMW).{{cite web|title=Information on N74 engines|url=http://www.bmwheaven.com/database/engine.php?type=N74|website=www.bmwheaven.com|access-date=11 August 2017|archive-date=6 October 2021|archive-url=https://web.archive.org/web/20211006190446/http://www.bmwheaven.com/database/engine.php?type=N74|url-status=live}}{{cite book|title=25 years of BMW 12-cylinder engines: setting new standards in the luxury class|date=October 2012|publisher=BMW Corporate Communications|location=Munich, Germany|url=https://www.press.bmwgroup.com/global/article/detail/T0133884EN/25-years-of-bmw-12-cylinder-engines-setting-new-standards-in-the-luxury-class|access-date=11 August 2017|archive-date=12 August 2017|archive-url=https://web.archive.org/web/20170812094715/https://www.press.bmwgroup.com/global/article/detail/T0133884EN/25-years-of-bmw-12-cylinder-engines-setting-new-standards-in-the-luxury-class|url-status=live}} However, the N74 does not have variable valve lift (called Valvetronic by BMW).{{cite web |url=http://australiancar.reviews/bmw_N74.php |title=BMW N74 engine |website=www.australiancar.reviews |access-date=12 March 2017 |archive-date=6 January 2017 |archive-url=https://web.archive.org/web/20170106010855/http://australiancar.reviews/bmw_N74.php |url-status=live }}

The N74 marked BMW's first use of an 8-speed automatic transmission, in the form of the ZF 8HP90.{{cite web |url=http://www.caranddriver.com/reviews/2010-bmw-760li-second-drive |title=2010 BMW 760Li – Second Drive – Car Reviews |website=www.caranddriver |access-date=12 March 2017 |archive-date=7 July 2017 |archive-url=https://web.archive.org/web/20170707022845/http://www.caranddriver.com/reviews/2010-bmw-760li-second-drive |url-status=live }}

Versions

Engine	Displacement	Power	Torque	Year
class="wikitable sortable" style="text-align: center;"
N74B60Hans-Stefan Braun, Thomas Brüner, Klaus Hirschfelder, Uwe Hoyer, Horst Kellerer, Johann Schopp, Christian Schwarz: [https://doi.org/10.1007/BF03225526 Der neue Zwölfzylinder-Ottomotor von BMW] {{Webarchive\|url=https://web.archive.org/web/20211006190445/https://link.springer.com/article/10.1007%2FBF03225526 \|date=2021-10-06 }}, in MTZ - Motortechnische Zeitschrift, November 2009, Volume 70, Issue 11, pp. 848	{{convert\|5972\|cc\|cuin\|abbr=on\|1}}	{{convert\|400\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|750\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,000 rpm	2008–2015
rowspan=3\|N74B66	rowspan=5\|{{convert\|6592\|cc\|cuin\|abbr=on\|1}}	{{convert\|420\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|780\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,000 rpm	2009–2020
{{convert\|465\|kW\|hp\|0\|abbr=on}} at 5,600 rpm	{{convert\|800\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,500 rpm	2013–2022
{{convert\|442\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|840\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2016–2020
rowspan=2\|N74B66TU	{{convert\|449\|kW\|hp\|0\|abbr=on}} at 5,500 rpm	{{convert\|800\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2016–2019
{{convert\|447.5\|kW\|hp\|0\|abbr=on}} at 5,500 rpm	{{convert\|850\|Nm\|lbft\|0\|abbr=on}} at 1,550 rpm	2020–2022
N74B68	{{convert\|6750\|cc\|cuin\|abbr=on\|1}}	{{convert\|420\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|900\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2017–present

= N74B60 =

This initial version of the N74 has a bore of {{convert|89|mm|in|1|abbr=on}} and a stroke of {{convert|80|mm|in|1|abbr=on}}. The redline is 7000 rpm and the compression ratio is 10.0:1.{{cite web|title=BMW N73 and N74 V12 Engines|url=http://www.unixnerd.demon.co.uk/n73.html|website=www.unixnerd.demon.co.uk|access-date=11 August 2017|archive-date=1 October 2017|archive-url=https://web.archive.org/web/20171001125256/http://www.unixnerd.demon.co.uk/n73.html|url-status=live}}

Applications:

2009–2015 F01/F02/F03 760i/760Li{{cite web|title=BMWBLOG Road Review: 2013 BMW 760Li – The Power of 12|url=http://www.bmwblog.com/2012/11/09/bmwblog-road-review-2013-bmw-760-li-the-power-of-12/|website=www.bmwblog.com|date=9 November 2012 |access-date=11 August 2017|archive-date=6 October 2021|archive-url=https://web.archive.org/web/20211006190445/https://www.bmwblog.com/2012/11/09/bmwblog-road-review-2013-bmw-760-li-the-power-of-12/|url-status=live}}

= N74B66 =

File:Rolls Royce 200EX 'Ghost' - Flickr - The Car Spy (1).jpg

The N74B66 is an enlarged version of the N74B60, due to a stroke of {{convert|88|mm|in|1|abbr=on}}. The redline is 7000 rpm and the compression ratio is 10.0:1. It produces up to {{convert|624|hp|kW|0|abbr=on|order=flip}} and is used in the Rolls-Royce Ghost.

Year	Application	Power output	Torque
class="wikitable sortable"
2010–2020	Rolls-Royce Ghost	{{convert\|563\|hp\|kW\|0\|abbr=on\|order=flip}}	{{convert\|575\|lbft\|Nm\|0\|abbr=on\|order=flip}}
2014–2020	Rolls-Royce Ghost V-Specification	rowspan="2" \| {{convert\|593\|hp\|kW\|0\|abbr=on\|order=flip}}	{{convert\|575\|lbft\|Nm\|0\|abbr=on\|order=flip}}
2019 \|Eadon Green Panthean Coupe	{{convert\|619.5\|lbft\|Nm\|0\|abbr=on\|order=flip}}
2014–2023	Rolls-Royce Wraith	{{convert\|624\|hp\|kW\|0\|abbr=on\|order=flip}}	{{convert\|590\|lbft\|Nm\|0\|abbr=on\|order=flip}}
2015–2023	Rolls-Royce Dawn	{{convert\|563\|hp\|kW\|0\|abbr=on\|order=flip}}	{{convert\|605\|lbft\|Nm\|0\|abbr=on\|order=flip}}

= N74B66TU =

2016 saw the introduction of the 6.6 liter N74 V12 variant to the BMW 7-series along with some Technical Updates (TU) for reliability. The facelifted 2020 models saw power reduced in the EU market to 430kW (577 bhp) due to emission regulations. This was partially compensated with an increase in torque to 850Nm (627 lb-ft). US models enjoyed the bump in torque with horsepower remaining close to the previous level at 600 bhp. Although the flagship 7-series was marked m760i in the USA and m760Li is some markets, all N74B66TU V12 powered 7-series were long wheelbase (G12); there was no short wheelbase (G11) variant offered world wide.

Applications:

2016–2022 G12 M760Li xDrive{{cite web|title=The new BMW M760Li xDrive|url=https://www.press.bmwgroup.com/global/article/detail/T0253462EN/the-new-bmw-m760li-xdrive|website=www.bmwgroup.com|access-date=11 August 2017|archive-date=12 August 2017|archive-url=https://web.archive.org/web/20170812064015/https://www.press.bmwgroup.com/global/article/detail/T0253462EN/the-new-bmw-m760li-xdrive|url-status=live}}{{cite web|title=Watch BMW's twin turbo all wheel drive V12 G11 M760li hustle to 162 miles per hour|url=http://www.bimmerboost.com/content.php?8373-Watch-BMW-s-twin-turbo-all-wheel-drive-V12-G11-M760li-hustle-to-162-miles-per-hour|website=www.bimmerboost.com|access-date=11 August 2017|archive-date=12 August 2017|archive-url=https://web.archive.org/web/20170812062221/http://www.bimmerboost.com/content.php?8373-Watch-BMW-s-twin-turbo-all-wheel-drive-V12-G11-M760li-hustle-to-162-miles-per-hour|url-status=live}}{{cite web|title=BMW N74B66TU / M760li xDrive|url=https://www.drive2.ru/o/b/2920120|website=www.drive2.ru|date=29 March 2016 |access-date=11 August 2017|language=Russian|archive-date=6 October 2021|archive-url=https://web.archive.org/web/20211006190444/https://www.drive2.ru/o/b/2920120|url-status=live}}

=N74B68=

The 6.75 litre version was introduced in the 2018 Rolls-Royce Phantom. It is also used in the Rolls-Royce Cullinan and Rolls-Royce Ghost, both of which are built on the same platform as the new Phantom.{{cite web|title=RealOEM.com - Online BMW Parts Catalog|url=http://www.realoem.com/bmw/enUS/showparts?id=TT61-EUR-07-2017-RR11-Rolls_Royce-Phantom&diagId=11_7005|website=www.realoem.com|access-date=20 November 2017|archive-date=20 November 2017|archive-url=https://web.archive.org/web/20171120100251/http://www.realoem.com/bmw/enUS/showparts?id=TT61-EUR-07-2017-RR11-Rolls_Royce-Phantom&diagId=11_7005|url-status=live}}

Applications:

2017–present Rolls-Royce Phantom VIII
2018–present Rolls-Royce Cullinan
2021–present Rolls-Royce Ghost

References

N74

Category:V12 engines

Category:Gasoline engines by model

Engine	Displacement	Power	Torque	Year
class="wikitable sortable" style="text-align: center;"
N74B60Hans-Stefan Braun, Thomas Brüner, Klaus Hirschfelder, Uwe Hoyer, Horst Kellerer, Johann Schopp, Christian Schwarz: [https://doi.org/10.1007/BF03225526 Der neue Zwölfzylinder-Ottomotor von BMW] {{Webarchive\|url=https://web.archive.org/web/20211006190445/https://link.springer.com/article/10.1007%2FBF03225526 \|date=2021-10-06 }}, in MTZ - Motortechnische Zeitschrift, November 2009, Volume 70, Issue 11, pp. 848	{{convert\|5972\|cc\|cuin\|abbr=on\|1}}	{{convert\|400\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|750\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,000 rpm	2008–2015
rowspan=3\|N74B66	rowspan=5\|{{convert\|6592\|cc\|cuin\|abbr=on\|1}}	{{convert\|420\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|780\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,000 rpm	2009–2020
{{convert\|465\|kW\|hp\|0\|abbr=on}} at 5,600 rpm	{{convert\|800\|Nm\|lbft\|0\|abbr=on}} at 1,500–5,500 rpm	2013–2022
{{convert\|442\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|840\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2016–2020
rowspan=2\|N74B66TU	{{convert\|449\|kW\|hp\|0\|abbr=on}} at 5,500 rpm	{{convert\|800\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2016–2019
{{convert\|447.5\|kW\|hp\|0\|abbr=on}} at 5,500 rpm	{{convert\|850\|Nm\|lbft\|0\|abbr=on}} at 1,550 rpm	2020–2022
N74B68	{{convert\|6750\|cc\|cuin\|abbr=on\|1}}	{{convert\|420\|kW\|hp\|0\|abbr=on}} at 5,250 rpm	{{convert\|900\|Nm\|lbft\|0\|abbr=on}} at 1,500 rpm	2017–present