| BMW S68 engine | |
|---|---|
S68 in BMW XM (G09)
| |
| Overview | |
| Manufacturer | BMW |
| Production | 2022–present |
| Layout | |
| Configuration | 90° V8 |
| Displacement | 4.4 L (4,395 cc) |
| Cylinder bore | 89 mm (3.50 in) |
| Piston stroke | 88.3 mm (3.48 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC w/ VVT |
| Combustion | |
| Fuel type | Petrol |
| Chronology | |
| Predecessor | BMW S63 |
The BMW S68 is a twin-turbocharged V8 engine produced by BMW. Its first use was in the 2022 revised BMW X7 as the M60i.[1] A few weeks after its presentation, BMW showed a study of the XM with a more powerful version of the engine.[2][3] In addition, the basic version is also used in BMW 760i,[4] BMW X5 M60i, and BMW X6 M60i.[5]
The S68 has a stroke of 88.3 mm (3.48 in) and the same displacement as its predecessor, but the compression ratio of 10.5:1 corresponds to the higher compressed predecessor variants.[6] It has one turbocharger per cylinder bank and both chargers are placed in the middle of the cylinder banks in a hot-vee design taken from the previous S63 variant; there is only one exhaust manifold. The S68 is the only current production V8 engine offered with a cross-pattern exhaust manifold for improved turbo charger pressure by combining exhaust pulses which comes at an expense of sound alternation, making the sound closer to a 180 degree configuration V8. The engine oil is cooled by an external cooler, and a newly developed oil pump is used for the oil circuit. The engine is now only offered as a 48-volt mild hybrid powerplant mild hybrid system, it has a 9 kW (12 hp) electric motor with a torque of 200 N⋅m (150 lbf⋅ft); unlike the previous mild hybrid systems from BMW, this is installed within the transmission.[1] The electric motor is also used for hot starts, while cold starts are performed by a standard 12 volt starter similar to most other engines. The 48-volt battery found in the X7 M60i, XM, and the 760i models has a capacity of 20 Ah.[6][7] the battery required for this has a capacity of 90 Ah.[7] The variable camshaft control (VANOS) is now electrical and no longer hydraulic.[7] The S68 currently meets the Euro 6d emissions standard,[1][6] but should also be able to achieve the stricter Euro 7 standard, which is planned for 2025.[8][7]
The electric motor in the S68 has a torque of 200 N⋅m (150 lbf⋅ft).[2][3] A maximum speed of 7200 rpm is reported for the combustion engine.[9]
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