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.
Specifications
| 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.
