BMW N74

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BMW N74 engine
2017-09-12 IAA 2017 BMW by Olaf Kosinsky-59.jpg
Overview
Production2008–present
Layout
Configuration60° V12
Displacement6.0–6.7 L (366–409 cu in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC w/ VVT
Combustion
TurbochargerTwin-turbo
Fuel typePetrol
Chronology
PredecessorBMW N73
Cutaway view of N74


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[edit]

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 11.6 psi (0.8 bar).[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).[4][5] However, the N74 does not have variable valve lift (called Valvetronic by BMW).[6]

The N74 marked BMW's first use of an 8-speed automatic transmission, in the form of the ZF 8HP90.[2]

Versions[edit]

Engine Displacement Power Torque Year
N74B60[3] 5,972 cc (364.4 cu in) 400 kW (536 hp)
at 5,250 rpm
750 N⋅m (553 lb⋅ft)
at 1,500–5,000 rpm
2009–present
N74B66 6,592 cc (402.3 cu in) 420 kW (563 hp)
at 5,250 rpm
780 N⋅m (575 lb⋅ft)
at 1,500–5,000 rpm
2009–present
465 kW (624 hp)
at 5,600 rpm
800 N⋅m (590 lb⋅ft)
at 1,500–5,500 rpm
2013–present
442 kW (593 hp)
at 5,250 rpm
840 N⋅m (620 lb⋅ft)
at 1,500 rpm
2016–present
N74B66TU 449 kW (602 hp)
at 5,500 rpm
800 N⋅m (590 lb⋅ft)
at 1,500 rpm
2016–present
N74B68 6,749 cc (411.8 cu in) 420 kW (563 hp)
at 5,250 rpm
900 N⋅m (664 lb⋅ft)
at 1,500 rpm
2017-present

N74B60[edit]

This initial version of the N74 has a bore of 89 mm (3.5 in) and a stroke of 80 mm (3.1 in). The redline is 7000 rpm and the compression ratio is 10.0:1.[7]

Applications:

N74B66[edit]

N74 in Rolls Royce Ghost

The N74B66 is an enlarged version of the N74B60, due to a stroke of 88 mm (3.5 in). The redline is 7000 rpm and the compression ratio is 10.0:1. It produces up to 465 kW (624 hp) and is used in the Rolls-Royce Ghost.[2]

Applications:

N74B66TU[edit]

Applications:

N74B68[edit]

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:

References[edit]

  1. ^ "BMW's biggest engine - the V12 - is safe until 2023". www.topgear.com. Retrieved 4 April 2019.
  2. ^ a b c "2010 BMW 760Li – Second Drive – Car Reviews". www.caranddriver. Retrieved 12 March 2017.
  3. ^ a b Hans-Stefan Braun, Thomas Brüner, Klaus Hirschfelder, Uwe Hoyer, Horst Kellerer, Johann Schopp, Christian Schwarz: Der neue Zwölfzylinder-Ottomotor von BMW, in MTZ - Motortechnische Zeitschrift, November 2009, Volume 70, Issue 11, pp. 848
  4. ^ "Information on N74 engines". www.bmwheaven.com. Retrieved 11 August 2017.
  5. ^ 25 years of BMW 12-cylinder engines: setting new standards in the luxury class. Munich, Germany: BMW Corporate Communications. October 2012. Retrieved 11 August 2017.
  6. ^ "BMW N74 engine". www.australiancar.reviews. Retrieved 12 March 2017.
  7. ^ "BMW N73 and N74 V12 Engines". www.unixnerd.demon.co.uk. Retrieved 11 August 2017.
  8. ^ "BMWBLOG Road Review: 2013 BMW 760Li – The Power of 12". www.bmwblog.com. Retrieved 11 August 2017.
  9. ^ "The new BMW M760Li xDrive". www.bmwgroup.com. Retrieved 11 August 2017.
  10. ^ "Watch BMW's twin turbo all wheel drive V12 G11 M760li hustle to 162 miles per hour". www.bimmerboost.com. Retrieved 11 August 2017.
  11. ^ "BMW N74B66TU / M760li xDrive". www.drive2.ru (in Russian). Retrieved 11 August 2017.
  12. ^ "RealOEM.com - Online BMW Parts Catalog". www.realoem.com. Retrieved 20 November 2017.