BMW M70

BMW M70 engine
Overview
Manufacturer BMW
Production 19881996
Combustion chamber
Configuration 60° V12
Chronology
Predecessor None
Successor BMW M73

The BMW M70 is a V12 SOHC piston engine which was BMW's first production V12[1] and was produced from 1988 to 1996.

Design

The M70 was essentially derived from two M20 straight-6 engines joined at a 60 degree angle.,[2] however the two engines share very few cross compatible parts. The engine has the same bore and stroke on each bank as the M20,[3] also the M70 has two Motronic ECUs (one for each cylinder bank).[4] This said, the M70 engine does differ from the M20 engine in a number of key ways, including:

Some examples of this engine are fitted with two alternators, such as in the E32 750iL Highline. One alternator is a full sized unit to service the car as on "regular" V12 models (regular to be taken in context of course), while the secondary smaller unit is used to charge an auxiliary battery and power all options in the rear passenger compartment, such as telephones and fax machines, as well as the wine cooler, independent climate control and power sun shields.

The compression ratio is 8.8:1, stroke is 75 mm (3.0 in) and bore is 84 mm (3.3 in).[5]

Models

EngineDisplacementPowerTorqueRedlineYear
M70B504,988 cc (304 cu in)220 kW (300 hp) @ 5200450 N·m (330 lb·ft) @ 410060001988
S70B565,576 cc (340 cu in)280 kW (380 hp) @ 5300 550 N·m (410 lb·ft) @ 4000 1992
S70/26,064 cc (370 cu in)461 kW (618 hp) @ 7400650 N·m (480 lb·ft) @ 670075001992
S70/35,990 cc (366 cu in)448 kW (601 hp) @ 7500651 N·m (480 lb·ft) @ 560075001997

M70B50

Applications:

S70

The S70 was an enlarged version of the M70 fitted to the performance flagship models, as well as dedicated performance cars. There were two production generations

S70B56

This is a 5,576 cc (340 cu in) variant of the M70 engine.[6] With 1,510 units produced, this is the lowest production BMW engine to date.[7]

Applications:

S70/2

Among the improvements over the other M70/S70 engines, the S70/2 features 4 valves per cylinder and variable valve timing (called dual-VANOS by BMW).[8] This engine is based on the European-market S50, and shares little in common with the rest of the M/S70 family.

Applications:

References

External links

Wikimedia Commons has media related to BMW M70 engine.

See also

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