Engine BMW N74B66

BMW N74B66 is a V-shaped 12-cylinder engine with a volume of 6.6 liters. Installed since 2010 on the Rolls-Royce Ghost and since 2013 on the Rolls-Royce Wraith. Received development in the form of N74B66TU. This more powerful version of the 6.6-liter engine has been installed since 2016 on the BMW M760Li xDrive.

Other modifications of N74: N74B60, N74B68.

The engine was installed on:

  • BMW 7-Series G11 since 2016 (N74B66TU);
  • Rolls-Royce Ghost 1 (RR4) since 2010;
  • Rolls-Royce Wraith 1 (RR5) since 2013;
  • Rolls-Royce Dawn 1 (RR6) since 2016.


Production years since 2010
Displacement, cc 6592
Fuel system direct injection
Power output, hp 570 – 632 (N74B66)
585 – 610 (N74B66TU)
Torque output, Nm 780 – 870 (N74B66)
800 – 850 (N74B66TU)
Cylinder block aluminum V12
Block head aluminum 48v
Cylinder bore, mm 89
Piston stroke, mm 88.3
Compression ratio 10.0
Features no
Hydraulic lifters yes
Timing drive chain
Phase regulator double VANOS
Turbocharging Twin-Turbo
Recommended engine oil 5W-30
Engine oil capacity, liter 10.5
Fuel type petrol
Euro standards EURO 5/6
Engine lifespan, km ~320 000
Firing order 1-7-5-11-3-9-6-12-2-8-4-10

Disadvantages of the N74B66 engine

  • The main problems of the motor are associated with rapid coking at idle;
  • Turbines can fail up to 100,000 km due to coking in oil lines;
  • By a mileage of 150 thousand km, the Double VANOS system may already require attention here;
  • After 150,000 km, timing chains often stretch, and their replacement will be expensive;
  • Also, valve stem seals quickly tan in the engine and lubricant consumption appears.

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