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BMW S65

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BMW S65 engine
Overview
ManufacturerBMW
Production2007–2013
Layout
ConfigurationDOHC 90° V8
Chronology
PredecessorBMW S54
SuccessorBMW S55

The BMW S65 is a naturally aspirated V8 petrol engine which replaced the S54 straight-six engine and was produced from 2007–2013. There is no direct replacement for the S65, since the next generation of M3 is powered by the BMW S55 turbocharged straight-six engine.

Derived from the S85 V10 engine first used in the E60 M5, the S65 shares the same basic architecture and aluminium construction. Unlike most other BMW M engines (which use the "S" model code), the S65 is not related to a regular production ("M" or "N") BMW engine.[1]

The S65 was introduced in the E92 M3 and was chosen as International Engine of the Year 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 92 mm (3.6 in) bore and 75.2 mm (3.0 in) stroke cylinder dimensions with the S85 V10. Other common features include individual throttle bodies,[3] ionic current knock sensing,[4] variable valve timing ("double-VANOS") and the 12.0:1 compression ratio.[5] The length of the S65 is 734 mm (28.9 in).[citation needed] The redline is 8400 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 V10.[6][7][8]

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,[9][10] which is based on the Siemens MSS65 ECU used in the S85 engine[11] and is capable of more than 200 million calculations per second.[citation needed]

The S65 weighs 202 kg (445 lb), which is 15 kg (33 lb) less than its S54 straight-6 engine predecessor.[12]

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.[13]

Models

Engine Displacement Power Torque Year
S65B40 3,998 cc (244 cu in) 309 kW (414 hp)
@ 8300 rpm		 400 N⋅m (300 lb⋅ft)
@ 3900 rpm		 2007
S65B44 4,361 cc (266 cu in) 331 kW (444 hp)
@ 8300 rpm		 440 N⋅m (320 lb⋅ft)
@ 3750 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 (3.2 in).[14] It also uses a lightweight titanium exhaust.[15]

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. ^ a b "Bmw M3 V8". www.kenrockwell.com. Archived from the original on 6 May 2007. Retrieved 2007-04-29. {{cite web}}: Unknown parameter |deadurl= ignored (|url-status= suggested) (help)
  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. ^ "3' E92 M3 Basic control unit DME / MSS60". www.realoem.com. Retrieved 18 August 2017.
  10. ^ "BMW S65 engine". www.australiancar.reviews. Retrieved 18 August 2017.
  11. ^ Aftersales Training - Product Information. E92 M3 Complete vehicle (PDF). BMW Service. July 2007. Retrieved 18 August 2017.
  12. ^ "The new BMW M3" (PDF). BMW USA. 2007-04-01. Retrieved 2007-04-29.
  13. ^ "Aftersales Training - Product Information. E92 M3 Complete vehicle" (pdf). www.bimmerfest.com. Retrieved 22 February 2018.
  14. ^ "FAQ E90 + E92 + E93 M3". www.bmwmregistry.com. Retrieved 15 August 2017.
  15. ^ "2010 BMW M3 GTS, an AW Flash Drive". www.autoweek.com. Retrieved 15 August 2017.
  16. ^ "New BMW M3 GTS with a larger 4.4L V8". www.paultan.org. Retrieved 18 June 2011.
  17. ^ "2012 BMW M3 CRT". www.topspeed.com. Retrieved 15 August 2017.
  18. ^ "2012 BMW M3 CRT Lightweight Sedan". www.caranddriver.com. Retrieved 15 August 2017.
  19. ^ "BMW M3 ALMS Racer". www.superstreetonline.com. Retrieved 15 August 2017.
  20. ^ "Photos: BMW M3 GTR". www.bmwblog.com. Retrieved 15 August 2017.
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