BMW S65

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BMW S65 engine
2009 BMW M3 Cabriolet - Flickr - The Car Spy (16).jpg
S65B40 in a E93 M3
Overview
ManufacturerGermany BMW
Production2007–2013
Layout
Configuration90° V8
Displacement4.0 L (3,999 cc)
Cylinder bore92 mm (3.62 in)
Piston stroke75.2 mm (2.96 in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC w/ VVT
Combustion
Fuel typePetrol
Chronology
PredecessorBMW S62
SuccessorBMW S63

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).

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[edit]

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 reduces charging rate during acceleration to maximise power, only fully 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[edit]

Engine Displacement Power Torque Year
S65B40 3,999 cc (244.0 cu in) 309 kW (420 PS; 414 hp)
at 8,300 rpm
400 N⋅m (295 lb⋅ft)
at 3,900 rpm
2007
S65B44 4,361 cc (266.1 cu in) 331 kW (450 PS; 444 hp)
at 8,300 rpm
440 N⋅m (325 lb⋅ft)
at 3,750 rpm
2010

S65B40[edit]

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

Applications:

S65B44[edit]

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[edit]

The P65 engine is used for motor racing.

Applications:


"The turbocharged M-cars certainly represent a transition (for better or worse) for BMW, and in particular BMW M.

Although the N/A engines with their ITBs and melodic symphonies are a thing of the past, we can still honor and appreciate such masterpieces of engineering without drawing negativity to the future.

Looking back, the S65 is truly special in that not only was it "inspired" by motorsport, but it is also a base [engine] from which motorsports continue to borrow from to this day." - 'Law' a global moderator on m3post.com and E9X M3

The S65 saw many uses in motorsports; many of which examples are vaguely documented. An archive of other engine variants of the S65 can be found on various bmw racing forums. [22]

See also[edit]

References[edit]

  1. ^ "2006 BMW M5 - First Drive Review". www.caranddriver. Archived from the original on 6 September 2011. Retrieved 23 February 2012.
  2. ^ "Archive". www.ukimediaevents.com. Archived from the original on 3 December 2017. Retrieved 18 August 2017.
  3. ^ The New BMW M3. BMW Media Information. April 2007. Archived from the original on 18 August 2017. 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. Archived from the original on 13 August 2014. 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.
  7. ^ "S65 oil pressure values". www.m3post.com. Archived from the original on 17 August 2017. Retrieved 18 August 2017.
  8. ^ "BMW S85 V10 and S65 V8 Engines". www.unixnerd.demon.co.uk. Archived from the original on 23 January 2016. 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. Archived from the original on 18 August 2017. Retrieved 18 August 2017.
  11. ^ "BMW S65 engine". www.australiancar.reviews. Archived from the original on 22 September 2016. Retrieved 18 August 2017.
  12. ^ Aftersales Training - Product Information. E92 M3 Complete vehicle (PDF). BMW Service. July 2007. Archived (PDF) from the original on 28 February 2021. 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. Archived from the original (PDF) on 3 March 2016. Retrieved 22 February 2018.
  15. ^ "FAQ E90 + E92 + E93 M3". www.bmwmregistry.com. Archived from the original on 22 October 2016. Retrieved 15 August 2017.
  16. ^ "2010 BMW M3 GTS, an AW Flash Drive". www.autoweek.com. Archived from the original on 15 August 2017. Retrieved 15 August 2017.
  17. ^ "New BMW M3 GTS with a larger 4.4L V8". www.paultan.org. Archived from the original on 24 February 2012. Retrieved 18 June 2011.
  18. ^ "2012 BMW M3 CRT". www.topspeed.com. Archived from the original on 6 October 2021. Retrieved 15 August 2017.
  19. ^ "2012 BMW M3 CRT Lightweight Sedan". www.caranddriver.com. Archived from the original on 15 August 2017. Retrieved 15 August 2017.
  20. ^ "BMW M3 ALMS Racer". www.superstreetonline.com. Archived from the original on 15 August 2017. Retrieved 15 August 2017.
  21. ^ "Photos: BMW M3 GTR". www.bmwblog.com. Retrieved 15 August 2017.
  22. ^ "BMW S65-based Racing Engines You've Probably Never Heard Of". www.m3post.com. Retrieved 2022-07-09.