BMW S65
| BMW S65B40O0 | |
|---|---|
 | |
| Overview | |
| Manufacturer | Bayerische Motoren Werke AG (BMW) |
| Production | 2007–2013 |
| Layout | |
| Configuration | 90° V8 |
| Displacement | 4.0 L (3,999 cc) |
| Cylinder bore | 92 mm |
| Piston stroke | 75.2 mm |
| Cylinder block material | Aluminum–silicon alloy |
| Cylinder head material | Aluminum alloy |
| Valvetrain | DOHC |
| Compression ratio | 12.0:1 |
| Combustion | |
| Fuel system | Fuel injection |
| Management | MSS60 ECU |
| Fuel type | Gasoline |
| Cooling system | Water-cooled |
| Output | |
| Power output | 309 kilowatts (414 hp) |
| Torque output | 400 N⋅m (295 lb⋅ft) |
| Dimensions | |
| Length | 734 mm |
| Chronology | |
| Predecessor | BMW S54 |
The BMW S65 is a V8 DOHC piston engine which replaced the (straight-6) S54 and was produced from 2007–present (as of September 2013).
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,[1] 2011, and 2012.
Models
| Engine | Displacement | Power | Torque | Redline | Year | Bore | Stroke |
|---|---|---|---|---|---|---|---|
| S65B40 | 3,999 cc (244 cu in) | 309 kW (414 hp) @ 8300 | 400 N⋅m (300 lb⋅ft) @ 3900 | 8400 | 2007 | 92mm | 75.2mm |
| S65B44 | 4,361 cc (266 cu in) | 331 kW (444 hp) @ 8300 | 440 N⋅m (320 lb⋅ft) @ 3750 | 8400 | 2010 | 92mm | 82mm |
S65B40
Applications:
- 2008-2013 BMW M3 E90/92/93 sedan/coupe/convertible
- 2009-Present Wiesmann MF4-S GT/Roadster
S65B44
Applications:
- 2010-2011 E92 M3 GTS coupe[2]
- 2011 E90 M3 CRT sedan
Development
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.[citation needed]
Design
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, along with the Double-VANOS variable valve timing system and 12.0:1 compression ratio.
A conventional wet-sump lubrication system with two oil pumps replaces the three-pump dry sump system used on the V10, further decreasing weight.[3][4] 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.[3]
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.[citation needed] 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.[5]
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 [6]
See also
References
- ^ http://www.ukipme.com/engineoftheyear/winners_10/3_4.html
- ^ Tan, Paul. "New BMW M3 GTS with a larger 4.4L V8". Paultan.org. Retrieved 2011-06-18.
- ^ a b "Bmw m3 v8". KenRockwell.com. 2007-04-20. Archived from the original on 6 May 2007. Retrieved 2007-04-29.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ http://bimmerboost.com/content.php?2070-Gintani-discusses-S65-V8-%28E9X-M3%29-engine-issues-weaknesses-and-defects-Will-BMW-do-a-recall
- ^ "The new BMW M3" (PDF). BMW USA. 2007-04-01. Retrieved 2007-04-29.
- ^ http://www.bimmerfest.com/pdf/BMW-M3-Aftersales-Training--Information.pdf
External links
