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词条 BMW N74
释义

  1. Design

  2. Versions

      N74B60    N74B66    N74B66TU    N74B68  

  3. References

{{Infobox automobile engine
|name=BMW N74 engine
|image=2017-09-12 IAA 2017 BMW by Olaf Kosinsky-59.jpg
|production=2008–present
|configuration=60° V12
|predecessor=BMW N73
|valvetrain=DOHC w/ VVT
|displacement={{convert|6.0|-|6.7|L|cuin|abbr=on|0}}
|block = Aluminium
|head = Aluminium
|fueltype=Petrol
|turbocharger=Twin-turbo
}}

The BMW N74 is a twin-turbo V12 petrol engine which replaced the N73 and has been produced from 2008 to present, production will end in 2023. [1]It is BMW's first turbocharged V12 engine and is also used in several Rolls-Royce models.

Design

Compared with its naturally aspirated BMW N73 predecessor, the N74 features twin-turbochargers. The turbochargers are located on the outside of the engine and use a boost pressure of {{convert|11.6|psi|bar|1|abbr=on}}.[2] In its base configuration, the engine has a compression of and a specific fuel consumption of 245 g·kW−1·h−1[3]

As per its predecessor, the N74 has direct injection, DOHC and variable valve timing (called double-VANOS by BMW).[2][3] However, the N74 does not have variable valve lift (called Valvetronic by BMW).[4]

The N74 marked BMW's first use of an 8-speed automatic transmission, in the form of the ZF 8HP90.[5]

Versions

EngineDisplacementPowerTorqueYear
N74B60[6]5972|cc|cuin|abbr=on|1}}400|kW|hp|0|abbr=on}}
at 5,250 rpm		750|Nm|lbft|0|abbr=on}}
at 1,500–5,000 rpm		 2009–present
N74B66{{convert|6592|cc|cuin|abbr=on|1}}420|kW|hp|0|abbr=on}}
at 5,250 rpm		780|Nm|lbft|0|abbr=on}}
at 1,500–5,000 rpm		 2009–present
465|kW|hp|0|abbr=on}}
at 5,600 rpm		800|Nm|lbft|0|abbr=on}}
at 1,500–5,500 rpm		2013–present
442|kW|hp|0|abbr=on}}
at 5,250 rpm		840|Nm|lbft|0|abbr=on}}
at 1,500 rpm		2016–present
N74B66TU 449|kW|hp|0|abbr=on}}
at 5,500 rpm		800|Nm|lbft|0|abbr=on}}
at 1,500 rpm		2016–present
N74B68 6749|cc|cuin|abbr=on|1}}420|kW|hp|0|abbr=on}}
at 5,250 rpm		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.[7]

Applications:

  • 2008–2015 F01/F02/F03 760i/760Li[8]

N74B66

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.[5]

Applications:

  • 2010–present Rolls-Royce Ghost {{convert|563|hp|kW|0|abbr=on|order=flip}} / {{convert|575|lbft|Nm|0|abbr=on|order=flip}}
  • 2014–present Rolls-Royce Ghost V-Specification {{convert|593|hp|kW|0|abbr=on|order=flip}} / {{convert|575|lbft|Nm|0|abbr=on}}
  • 2014–present Rolls-Royce Wraith, {{convert|624|hp|kW|0|abbr=on|order=flip}} / {{convert|590|lbft|Nm|0|abbr=on|order=flip}}
  • 2015–present Rolls-Royce Dawn {{convert|563|hp|kW|0|abbr=on|order=flip}} / {{convert|605|lbft|Nm|0|abbr=on|order=flip}}

N74B66TU

Applications:

  • 2016-present G12 M760Li xDrive[9][10][11]

N74B68

The 6.8 litre version was introduced in the 2018 Rolls-Royce Phantom. It is also used in the Rolls-Royce Cullinan SUV, built on the same platform as new Phantom.[12]

Applications:

  • 2017-present Rolls-Royce Phantom VIII
  • 2018-present Rolls-Royce Cullinan

References

1. ^{{cite web|url=https://www.topgear.com/car-news/future-tech/bmws-biggest-engine-v12-safe-until-2023 |title=BMW’s biggest engine - the V12 - is safe until 2023 |website=www.topgear.com |accessdate=4 April 2019}}
2. ^{{cite web|title=Information on N74 engines|url=http://www.bmwheaven.com/database/engine.php?type=N74|website=www.bmwheaven.com|accessdate=11 August 2017}}
3. ^{{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|accessdate=11 August 2017}}
4. ^{{cite web|url=http://australiancar.reviews/bmw_N74.php |title=BMW N74 engine |website=www.australiancar.reviews |accessdate=12 March 2017}}
5. ^1 2 {{cite web|url=http://www.caranddriver.com/reviews/2010-bmw-760li-second-drive |title=2010 BMW 760Li – Second Drive – Car Reviews |website=www.caranddriver |accessdate=12 March 2017}}
6. ^1 Hans-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], in MTZ - Motortechnische Zeitschrift, November 2009, Volume 70, Issue 11, pp. 848
7. ^{{cite web|title=BMW N73 and N74 V12 Engines|url=http://www.unixnerd.demon.co.uk/n73.html|website=www.unixnerd.demon.co.uk|accessdate=11 August 2017}}
8. ^{{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|accessdate=11 August 2017}}
9. ^{{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|accessdate=11 August 2017}}
10. ^{{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|accessdate=11 August 2017}}
11. ^{{cite web|title=BMW N74B66TU / M760li xDrive|url=https://www.drive2.ru/o/b/2920120|website=www.drive2.ru|accessdate=11 August 2017|language=Russian}}
12. ^{{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|accessdate=20 November 2017}}
{{BMW automotive petrol engines: 2000s to 2010s}}{{DEFAULTSORT:Bmw N74}}

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