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The BMW S68 is a twin-turbocharged V8 engine produced by BMW. It will be used for the first time 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 the BMW 760i for the US market.[4]

BMW S68 engine
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)
Block material	Aluminium
Head material	Aluminium
Valvetrain	DOHC w/ VVT
Combustion
Fuel type	Petrol
Chronology
Predecessor	BMW N63

Design

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.[5] 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 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.[5][6] the battery required for this has a capacity of 90 Ah.[6] The variable camshaft control (VANOS) is now electrical and no longer hydraulic.[6] The S68 currently meets the Euro 6d emissions standard,[1][5] but should also be able to achieve the stricter Euro 7 standard, which is planned for 2025.[7][6]

The electric motor in the S68 has a torque of 450 N⋅m (330 lbf⋅ft).[2][3] A maximum speed of 7200 rpm is reported for the combustion engine.[8]

It seems to date that the S68 is an evolution of the S63 with common issues being rectified, and being paired to a mild hybrid transmission.

See also

• List of BMW engines

References

На других языках

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[de] BMW S68

Der BMW S68 ist ein V8-Ottomotor von BMW. Er wird erstmals im 2022 überarbeiteten BMW X7 als M60i eingesetzt.[1] Wenige Wochen nach deren Vorstellung zeigte BMW eine Studie des XM mit einer stärkeren Variante des Motors.[2][3] Darüber hinaus wird die Basisversion auch im BMW 760i für den US-Markt eingesetzt.[4]

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- [en] BMW S68

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