This version of the BMW N74 engine was created specifically for the new 2018 Rolls-Royce Phantom. The N74B68 is also installed on the off-road Rolls-Royce Cullinan. This powerful V12 excels in any kind of workload. But the attention of the owner requires priority, and the service is impeccable.
N74 family: N74B60, N74B66, N74B68.
Specifications
| Production years | since 2018 |
| Displacement, cc | 6749 |
| Fuel system | direct injection |
| Power output, hp | 563 – 571 |
| Torque output, Nm | 850 – 900 |
| Cylinder block | aluminum V12 |
| Block head | aluminum 48v |
| Cylinder bore, mm | 89 |
| Piston stroke, mm | 90.4 |
| 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 6 |
| Engine lifespan, km | ~330 000 |
| Firing order | 1-7-5-11-3-9-6-12-2-8-4-10 |
| Weight, kg | 235 |
The engine was installed on:
- Rolls-Royce Phantom 8 (RR11) since 2018;
- Rolls-Royce Cullinan 1 (RR31) since 2019.
Disadvantages of the N74B68 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 N74B68
How much power does the BMW N74B68 make?
The BMW N74B68 develops 563 - 571 hp and 850 - 900 Nm of torque.
How much oil does the BMW N74B68 take and which one?
Engine oil capacity: 10.5 liters. Recommended oil: 5W-30.
Does the BMW N74B68 have a timing belt or chain?
The BMW N74B68 uses a timing chain.
Is the BMW N74B68 turbocharged?
Yes, the BMW N74B68 is turbocharged (Twin-Turbo).
Does the BMW N74B68 need valve clearance adjustment?
No, the BMW N74B68 has hydraulic lifters, so the valve clearances do not need to be adjusted.
How long does the BMW N74B68 last?
The typical lifespan of the BMW N74B68 is ~330 000 km with proper maintenance.
What cars was the BMW N74B68 installed on?
Rolls-Royce Phantom 8 (RR11) since 2018; Rolls-Royce Cullinan 1 (RR31) since 2019.
What are the common problems of the BMW N74B68?
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.
N73 engine has above mentioned bore and stroke
N74 engine:
bore: 89,0 mm
stroke: 90,4 mm
Thanks, the bug has been fixed!