A scaled-down version of the N63B44, the 8-cylinder V-engine N63B40 was sold in China. The volume is lowered to 3982 cc (243.0 cu in) due to the shorter stroke of 80 mm (3.15 in).
Other modifications of N63: N63B44.
The engine was installed on:
- BMW F12/F13 650i in 2012-2015;
- BMW F01/F02 750i/750Li in 2012-2015.
Specifications
| Production years | 2012-2015 |
| Displacement, cc | 3982 |
| Fuel system | direct injection |
| Power output, hp | 408 – 449 |
| Torque output, Nm | 600 – 650 |
| Cylinder block | aluminum V8 |
| Block head | aluminum 32v |
| Cylinder bore, mm | 89 |
| Piston stroke, mm | 80 |
| Compression ratio | 10.0 |
| Features | Valvetronic III |
| Hydraulic lifters | yes |
| Timing drive | chain |
| Phase regulator | dual-VANOS |
| Turbocharging | yes |
| Recommended engine oil | 5W-30 |
| Engine oil capacity, liter | 8.5 |
| Fuel type | petrol |
| Euro standards | EURO 5 |
| Engine lifespan, km | ~250 000 |
Disadvantages of the N63B40 engine
First of all, the wear of the valve stem seals and the presence of rings indicate that this is an oil burner;
The head may rise due to the weak threads in the soft aluminum cylinder block;
Here, regular candles quickly burn out and start misfires;
The overflow of piezo injectors can result in a water hammer after a prolonged stay;
The turbine’s oil supply pipes eventually coke, shortening their lifespan;
The dual-VANOS and Valvetronic timing mechanism is unreliable.