BMW S68

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]

• List of BMW engines