BMW S68 engine
S68 in BMW XM (G09)
Overview
ManufacturerBMW
Production2022–present
Layout
Configuration90° V8
Displacement4.4 L (4,395 cc)
Cylinder bore89 mm (3.50 in)
Piston stroke88.3 mm (3.48 in)
Cylinder block materialAluminium
Cylinder head materialAluminium
ValvetrainDOHC w/ VVT
Combustion
Fuel typePetrol
Chronology
PredecessorBMW 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]

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.[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 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]

See also

References

  1. 1 2 3 Jordan Mulach (2022-04-15). "BMW debuts all-new 4.4-litre twin-turbo S68 V8". whichcar.com.au. Retrieved 2022-06-28.
  2. 1 2 Sven Kötter (2022-05-16). "Neuer BMW XM (2022): Erste Testfahrt". autozeitung.de. Retrieved 2022-06-28.
  3. 1 2 Thomas Hellmanzik (2022-05-19). "BMW XM (2023): 2,7 Tonnen und trotzdem M?". auto-motor-und-sport.de. Retrieved 2022-06-28.
  4. ↑ Benny (2022-04-20). "BMW 7er G70: Motoren & Daten von 740d & M760e bis i7 M70". bimmertoday.de. Retrieved 2022-06-28.
  5. ↑ "The 2024 BMW X5 and X6". www.press.bmwgroup.com. Retrieved 2023-06-07.
  6. 1 2 3 "Der neue BMW X7. Seite 3" (PDF). press.bmwgroup.com. Retrieved 2022-06-28.
  7. 1 2 3 4 Jeff M (2022-04-15). "BMW S68 Twin-Turbo V8 - An M-Division engine for the masses". technicalripon.com. Retrieved 2022-06-28.
  8. ↑ Christiane Köllner (2022-01-10). "Was Euro 7 für die Zukunft der Verbrennungsmotoren bedeutet". springerprofessional.de. Retrieved 2022-06-29.
  9. ↑ "BMW XM 2022 Review – International". carsales.com.au. 2022-05-18. Retrieved 2022-06-28.
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