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BMW S65 V8 Engine

From 2007 to 2013

 BMW S65 V8 Engine  From 2007 to 2013

The BMW S65 is a V8 DOHC piston engine which replaced the (straight-6) S54 and was produced from 2007–2013.

The S65 is a high speed V8 - aspirated engine with overhead camshafts and 32 valves from BMW . He shares with the S85 V10 from the M5 / M6 the basic architecture and the aluminum construction. He was introduced in the E92 M3 as the successor to the S54 straight-six . The engine won at the International Engine of the Year awardsthe category "3 to 4 liters displacement" for five consecutive years. With a maximum speed of 8,400 revolutions per minute, the S65 is the highest-revving production engine that BMW has ever built.

The S65B40 was developed in response to the ever stricter emission standards Euro V and CARB .  Because the predecessor engine S54 had exhausted the potential for development, it has developed its successor, the S65.

It shares with the S85 the same bore of 92 mm and the same stroke of 75.2 mm, as well as the double VANOS and the compression ratio of 12.0: 1. In contrast to theS85 , the VANOS system in the S65 is powered by engine oil pressure, which eliminates the need for a separate high-pressure hydraulic system as installed in the S85.

The engine block , which consists of a eutectic aluminum - silicon alloy, comes from BMW's Formula 1 Foundry Landshut , while the cylinder heads are made of hydroaluminium in Austria. Other noteworthy features include iron-jacketed aluminum pistons, ion-current knock control , steel-magnesium connecting rods, a steel-forged crankshaft ( cross-plane design), and a single-throttle intake system, where one cylinder bank is always driven in compound by an electromechanical actuator.

For the S65, a newer version MS S65 was developed from the engine control unit of the S85 . It can perform more than 200 million calculations per second compared to 25 million for the predecessor BMW S54 . The resulting engine weighs 202 kg, 15 kg less than its predecessor with only 6 cylinders. 

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.

Models

Engine Displacement Power Torque Redline Bore Stroke Year
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

S65B40

BMW S65 V8 Engine S65B40

Applications:

2008 to 2013 BMW M3 E90/92/93 sedan/coupe/convertible Engine specification

Engine Size 3999cc
Cylinders 8
Valves 32
Fuel Type Petrol
Power 414 bhp
Top Speed 155 mph
0-60 mph 4.6 secs
Torque 400 Nm, 295 ft-lb
CO2 Emissions 295 g/km
Euro Emissions Standard 4
Miles Per Tank 304 miles
  • 2008-2013 BMW M3 E90/92/93 sedan/coupe/convertible
  • 2009-2014 Wiesmann MF4-S GT/Roadster

S65B44

Applications:

  • 2010-2011 E92 M3 GTS coupe
  • 2011 E90 M3 CRT

P65B44

Applications:

  • 2011 BMW Z4 GTE (non-production)
  • 2011 BMW Z4 GT3 (non-production)

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.

 
BMW S65B40
Combustion chamber
Configuration 90° V8
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
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)

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 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.

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 

BMW S65 V8 Engine S65B40 specification

Technical

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