BMW M70

BMW M70 engine

Manufacturer	BMW
Production	1988–1996
Predecessor	None
Successor	BMW M73
Configuration	SOHC V12

The BMW M70 is a V12 piston engine and featured heavily in the 7-Series and 8-Series BMWs of the late 80s and early 1990s. Models included:

• 1988–1994 BMW 750i
• 1988–1994 BMW 750iL
• 1991–1993 BMW 850i
• 1993–1995 BMW 850Ci
• 1994–1996 BMW 850Csi

The M70 was succeeded by the M73.

Models

Engine	Displacement	Power	Torque	Redline	Year
M70B50	4,988 cc (4.988 L; 304.4 cu in)	220 kW (295 hp) @ 5200	450 N·m (330 lb·ft) @ 4100	6000	1988
		220 kW (295 hp) @ 5200	450 N·m (330 lb·ft) @ 4100	6000	1988

Types

M70 engine in 1992 750iL

Euro Specifications

• Displacement: 4,988 cc (4.988 L; 304.4 cu in)
• 12 cylinder V-arrangement 60 degree
• 24 valves
• Compression: 8.8:1
• Stroke/Bore: 75 mm (3.0 in)/84 mm (3.3 in)
• Firing Order: 1-7-5-11-3-9-6-12-2-8-4-10
• Separate twin-ECU engine management (each one for each bank)
• Max power: 220 kW (295 hp) @ 5300 rpm
• Max torque: 450 N·m (330 lb·ft) @ 4000 rpm
• Max rpm: 6000–6400 rpm *Gearing

Applications

• 1986–1994 E32 7-Series
• 1989–1999 E31 8-Series

S70B56

5.6 L version

Applications

• 1992–1996 E31 8-Series
• Developed specifically for the 1992 BMW 850CSi, a BMW Motorsport vehicle
• Lowest production engine in BMW history—1,510 units
• Engine was used in a few supercars of the late 1990s

S70/1

6000 cc (approx.) version.

Applications

• M8 prototype

S70/2

6,064 cc (6.064 L; 370.0 cu in) version developed for the McLaren F1. The S70/2 was a complete redesign from M70 with no common parts, featuring a lighter and smaller engine block. The S70/2 is similar to the S50B30 engine from the E36 M3 in that the S70/2 features dual VANOS with two position adjustable variable intake valve timing.

Applications

• 1993–1998 McLaren F1
• 1998–1999 BMW V12 LM
• 1999–2000 BMW V12 LMR
• 2000 BMW X5 LM Prototype

S70/3

6064 cc version, further refinement of the McLaren F1 engine meant for racing. Later destroked to 5990 cc in 1997.

Applications

• 1995–1996 McLaren F1 GTR (6.1 L)
• 1997 McLaren F1 GTR (6.0 L)

External links

• Johan & Sean's E32 Page - Homepage containing detailed DIY and engine rebuild information for the M70 engine as well as links to official BMW AG engine specs and component descriptions.

See also

• BMW E31