BMW S65

The BMW S65 is a naturally aspirated V8 petrol engine which was produced from 2007–2013. Its main use was in the BMW M3 (where it replaced the BMW S54 straight-six engine). There is no direct replacement for the S65, since the following generation of M3 switched to a turbocharged straight-six engine (the BMW S55).

BMW S65 engine
Overview
Production2007–2013
Layout
Configuration90° V8
Block materialAluminium
Head materialAluminium
ValvetrainDOHC w/ VVT
Combustion
Fuel typePetrol
Chronology
PredecessorNone
SuccessorNone

Derived from the BMW S85 V10 engine (as used in the E60 M5), the S65 shares the same basic architecture and aluminium construction. Unlike most other BMW M engines, the S65 and S85 are not related to a regular production BMW engine.[1]

The S65 won the International Engine of the Year award for the 3.0 to 4.0 L category in 2008, 2009, 2010, 2011 and 2012.[2]

Design
S65 engine with the top plastic air plenum removed to reveal the 8 individual throttle bodies.

The S65 shares the same cylinder dimensions with the S85 V10, with a 92 mm (3.6 in) bore and a 75.2 mm (3.0 in) stroke. Other common features include individual throttle bodies,[3] ionic current knock sensing,[4] double-VANOS (variable valve timing) and the 12.0:1 compression ratio.[5] The redline is 8,400 rpm.

To reduce weight, a wet-sump lubrication system with two electrically operated scavenging pumps and a main oil pump replaces the three-pump wet-sump system used on the S85.[6][7][8] The dry weight of the S65 is 202 kg (445 lb).[9]

The alternator disconnects from the engine during acceleration to maximise power, only charging the battery during braking and decelerating whenever possible, in a system BMW calls Brake Energy Regeneration.[6]

The engine control unit (ECU/DME) is a Siemens MSS60,[10][11] which is based on the Siemens MSS65 ECU used in the S85 engine[12] The S65 weighs 202 kg (445 lb), which is 15 kg (33 lb) less than its S54 straight-6 engine predecessor.[13]

The firing order for the S65 engine is 1-5-4-8-7-2-6-3, which is different from the typical BMW V8 firing order of 1-5-4-8-6-3-7-2.[14]

Versions
EngineDisplacementPowerTorqueYear
S65B403,999 cc (244.0 cu in)309 kW (414 hp)
at 8,300 rpm		400 N⋅m (295 lb⋅ft)
at 3,900 rpm		2007
S65B444,361 cc (266.1 cu in)331 kW (444 hp)
at 8,300 rpm		440 N⋅m (325 lb⋅ft)
at 3,750 rpm		2010

S65B40

The S65B40 has a bore of 92 mm (3.6 in) and a stroke of 75.2 mm (3.0 in).

Applications:

S65B44

The S65B44 is an enlarged version of the S65, due to a larger stroke of 82 mm (3.23 in).[15] It also uses a lightweight titanium exhaust.[16]

Applications:

P65B44

The P65 engine is used for motor racing.

Applications:

See also

References
  1. "2006 BMW M5 - First Drive Review". www.caranddriver. Retrieved 23 February 2012.
  2. "Archive". www.ukimediaevents.com. Retrieved 18 August 2017.
  3. The New BMW M3. BMW Media Information. April 2007. Retrieved 18 August 2017.
  4. "2010 BMW M3 GTS". www.supercars.net. Retrieved 18 August 2017.
  5. "Engine specifications for motorsport engines". www.bmwheaven.com. Retrieved 17 August 2017.
  6. "Bmw M3 V8". www.kenrockwell.com. Archived from the original on 6 May 2007. Retrieved 2007-04-29.
  7. "S65 oil pressure values". www.m3post.com. Retrieved 18 August 2017.
  8. "BMW S85 V10 and S65 V8 Engines". www.unixnerd.demon.co.uk. Retrieved 18 August 2017.
  9. "The new BMW M3" (PDF) (Press release). April 2007. p. 7. Archived from the original (PDF) on 6 October 2007.
  10. "3' E92 M3 Basic control unit DME / MSS60". www.realoem.com. Retrieved 18 August 2017.
  11. "BMW S65 engine". www.australiancar.reviews. Retrieved 18 August 2017.
  12. Aftersales Training - Product Information. E92 M3 Complete vehicle (PDF). BMW Service. July 2007. Retrieved 18 August 2017.
  13. "The new BMW M3" (PDF). BMW USA. 2007-04-01. Archived from the original (PDF) on 2007-10-06. Retrieved 2007-04-29.
  14. "Aftersales Training - Product Information. E92 M3 Complete vehicle" (pdf). www.bimmerfest.com. Retrieved 22 February 2018.
  15. "FAQ E90 + E92 + E93 M3". www.bmwmregistry.com. Retrieved 15 August 2017.
  16. "2010 BMW M3 GTS, an AW Flash Drive". www.autoweek.com. Retrieved 15 August 2017.
  17. "New BMW M3 GTS with a larger 4.4L V8". www.paultan.org. Retrieved 18 June 2011.
  18. "2012 BMW M3 CRT". www.topspeed.com. Retrieved 15 August 2017.
  19. "2012 BMW M3 CRT Lightweight Sedan". www.caranddriver.com. Retrieved 15 August 2017.
  20. "BMW M3 ALMS Racer". www.superstreetonline.com. Retrieved 15 August 2017.
  21. "Photos: BMW M3 GTR". www.bmwblog.com. Retrieved 15 August 2017.
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