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.
N74 family: N74B60, N74B66, N74B68.
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 |
| Weight, kg | 235 |
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.
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.
Frequently asked questions about the BMW N74B66
How much power does the BMW N74B66 make?
Power output of the BMW N74B66, hp: 570 - 632 (N74B66); 585 - 610 (N74B66TU). Torque, Nm: 780 - 870 (N74B66); 800 - 850 (N74B66TU).
How much oil does the BMW N74B66 take and which one?
Engine oil capacity: 10.5 liters. Recommended oil: 5W-30.
Does the BMW N74B66 have a timing belt or chain?
The BMW N74B66 uses a timing chain.
Is the BMW N74B66 turbocharged?
Yes, the BMW N74B66 is turbocharged (Twin-Turbo).
Does the BMW N74B66 need valve clearance adjustment?
No, the BMW N74B66 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the BMW N74B66 last?
The typical lifespan of the BMW N74B66 is ~320 000 km with proper maintenance.
What cars was the BMW N74B66 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.
What are the common problems of the BMW N74B66?
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. All known problems.
