BMW S68 - Misplaced Pages

Reciprocating internal combustion engine

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
Turbocharger	Twin-turbo
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. A few weeks after its presentation, BMW showed a study of the XM with a more powerful version of the engine. In addition, the basic version is also used in BMW 760i, BMW X5 M60i, and BMW X6 M60i.

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

The electric motor in the S68 has a torque of 200 N⋅m (150 lbf⋅ft). A maximum speed of 7200 rpm is reported for the combustion engine.

Applications:

2022– G70 760i xDrive
2022– G09 XM
2023– G05 X5 M60i
2023– G06 X6 M60i
2024– F96 X6 M Competition
2023– G07 X7 M60i
2024– G90 M5
2024– G99 M5

References

^ Jordan Mulach (2022-04-15). "BMW debuts all-new 4.4-litre twin-turbo S68 V8". whichcar.com.au. Retrieved 2022-06-28.
^ Sven Kötter (2022-05-16). "Neuer BMW XM (2022): Erste Testfahrt". autozeitung.de. Retrieved 2022-06-28.
^ Thomas Hellmanzik (2022-05-19). "BMW XM (2023): 2,7 Tonnen und trotzdem M?". auto-motor-und-sport.de. Retrieved 2022-06-28.
Benny (2022-04-20). "BMW 7er G70: Motoren & Daten von 740d & M760e bis i7 M70". bimmertoday.de. Retrieved 2022-06-28.
"The 2024 BMW X5 and X6". www.press.bmwgroup.com. Retrieved 2023-06-07.
^ "Der neue BMW X7. Seite 3" (PDF). press.bmwgroup.com. Retrieved 2022-06-28.
^ Jeff M (2022-04-15). "BMW S68 Twin-Turbo V8 - An M-Division engine for the masses". technicalripon.com. Retrieved 2022-06-28.
Christiane Köllner (2022-01-10). "Was Euro 7 für die Zukunft der Verbrennungsmotoren bedeutet". Springerprofessional.de. Retrieved 2022-06-29.
"BMW XM 2022 Review – International". carsales.com.au. 2022-05-18. Retrieved 2022-06-28.