Engine BMW M70B50

The 5.0-liter 12-cylinder BMW M70 or M70B50 engine was produced from 1987 to 1994 and was installed on the top models of the concern of its time: the 7-Series sedan and 8-Series coupe. In addition to the usual 300 hp version, there were 350 hp D1/1 motors for Alpina models.

The engine was installed on:

  • BMW 7-Series E32 in 1987 – 1994;
  • BMW 8-Series E31 in 1989 – 1994.

Specifications

Production years 1987-1994
Displacement, cc 4998
Fuel system distributed injection
Power output, hp 300
350 (Alpina D1/1)
Torque output, Nm 450
470 (Alpina D1/1)
Cylinder block aluminum V12
Block head aluminum 24v
Cylinder bore, mm 84
Piston stroke, mm 75
Compression ratio 8.8
9.5 (Alpina D1/1)
Features no
Hydraulic lifters yes
Timing drive chain
Phase regulator no
Turbocharging no
Recommended engine oil 5W-40
Engine oil capacity, liter 7.5
Fuel type 95
Euro standards EURO 2
Fuel consumption, L/100 km (for BMW 750iL 1990)
— city
— highway
— combined
20.8
8.9
13.6
Engine lifespan, km ~340 000

Disadvantages of the M70B50 engine

  • First of all, you should know that the BMW 750 usually consumes about 25 liters per hundred;
  • The main problems here are delivered by electronic throttle control units EML;
  • Quite often, the cause of a malfunction in the engine ECU is a simple break in the wiring;
  • Many owners have experienced severe valve guide wear;
  • The weak points of the engine also include ignition coils, crankshaft position sensor.

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