|Manufacturer||Bayerische Motoren Werke AG (BMW)|
|Displacement||4.0 L (3,999 cc)|
|Cylinder bore||92 mm|
|Piston stroke||75.2 mm|
|Cylinder block alloy||Aluminum–silicon alloy|
|Cylinder head alloy||Aluminum alloy|
|Fuel system||Fuel injection|
|Power output||309 kilowatts (414 hp)|
|Torque output||400 N·m (295 lb·ft)|
Derived from the BMW S85 V10 engine used in the M5/M6, it shares the same basic architecture and aluminium construction. It 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.
|S65B40||3,998 cc (244 cu in)||309 kW (414 hp) @ 8300||400 N·m (300 lb·ft) @ 3900||8400||92 mm||75.2 mm||2007|
|S65B44||4,361 cc (266 cu in)||331 kW (444 hp) @ 8300||440 N·m (320 lb·ft) @ 3750||8400||92 mm||82 mm||2010|
- 2008-2013 BMW M3 E90/92/93 sedan/coupe/convertible
- 2009-2014 Wiesmann MF4-S GT/Roadster
- 2011 BMW Z4 GTE (non-production)
- 2011 BMW Z4 GT3 (non-production)
The S65 engine was developed due to its S54 predecessor having reached the end of its development potential and being unable to meet increasingly stringent Euro V and California Air Resources Board (CARB) emissions regulations.
A wet-sump lubrication system with an oil return pump and a main oil pump replaces the three-pump wet-sump system used on the V10, further decreasing weight. 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.
An updated version of the Siemens MSS65 ECU (used in the S85 V10) is fitted to the V8. Claimed to be capable of more than 200 million calculations per second, the new ECU (known as the MSS60) comfortably exceeds the 25 million calculations of which the S54's ECU was capable. The MSS60 was actually produced before the MSS65 control unit, although it was not put into production vehicles until the M3 in 2007. The newer M3 control units are manufactured by Continental and are no longer labeled Siemens.
The resulting engine weighs 202 kg (445 lb): 15 kg (33 lb) lighter than the straight-6 engine it replaces, while also being shorter.
- Tan, Paul. "New BMW M3 GTS with a larger 4.4L V8". Paultan.org. Retrieved 2011-06-18.
- "Bmw m3 v8". KenRockwell.com. 2007-04-20. Archived from the original on 6 May 2007. Retrieved 2007-04-29.
- "The new BMW M3" (PDF). BMW USA. 2007-04-01. Retrieved 2007-04-29.
- The UnixNerd's BMW S65 engine page with photos, history and common problems.
|Wikimedia Commons has media related to BMW S65 engine.|
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