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History

BMW M102 Straight-6 engine

 From 1980 to 1982
BMW M102 Straight-6 engine
 

The BMW M102 (also known as "M30B32LAE") is a turbocharged straight-6 SOHC piston engine which was produced from 1980–1982. The engine was used in the E23 BMW 745i and superseded by the M106.

It was based on the M30 engine and has a displacement of 3,210 cc (196 cu in). The KKK turbocharger produces 9 PSI of boost and an air-to-air intercooler is used. The M102 produces 188 kW (252 hp) and was used in the BMW E23 7 Series, where it was designated "745i".

Applications:

  • 1980–1982 E23 745i

BMW M102 Straight-6 engine E23

 

Technical

  • Technical details and specifications BMW M102 Engine (1980-1982)

    BMW 7 Series (E23) 3.2L 745i

    No. of cylinders 6/OHC
    Capacity 3210 cc
    Firing order 1-5-3-6-2-4
    Compression ratio 7.0:1
    Suitable for unleaded petrol No
    Fuel system Make Bosch L-Jetronic
    Ignition system coil Make Bosch 0 221 122 010
    Distributor Make Bosch 0 237 304 017
    Thermostat opens 80 °C
    Starter motor Make Bosch 0 001 314 025
    Minimum starting voltage 10.0V
    Maximum cranking amps 178-218A
    Alternator Make Bosch 0 120 469 539

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Service

  • Service Guide BMW M102 Engine (1980-1982)
     

    BMW 7 Series (E23) 3.2L 745i

    Spark plugs Electrode gap 0.7-0.8 mm
    Spark plugs Tighten 24-28 Nm
    Spark plugs Original equipment Bosch W8DC
    Spark plugs Make Autolite Type 64
    Spark plugs Make Champion N9YCC
    Spark plugs Make NGK BP5ES
    Valve clearance -INLET 0.30 mm Check cold
    Valve clearance -EXHAUST 0.30 mm Check cold
    Drive belt size - alternator 12.5x1055mm
    Engine oil grade - moderate climate 10W/40 SAE
    Engine oil change 5.8 litres
    Manual gearbox oil 1.2 litres
    Automatic transmission 3.0 litres
    Differential oil rear 1.6 litres
    Cooling system 12.0 litres

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