M30B34 3.4L 6 Cylinder Built from 1982 to 1988

M30B34

This engine has a bore of 92.0 mm, a stroke of 86.0 mm and a displacement of 3428cc. In the E24 635CSi, it uses Bosch Motronic 1.0 fuel injection.[5]

With catalytic converter: 8.0:1 compression ratio, 185 brake horsepower (138 kW) - mostly North America and Japan

Applications:

1982–1987 E24 635CSi

1982-1987 E23 735i (160 kW)

1985-1988 E28 535i (136 kW, North America only)

1985-1987 E23 735i (136 kW, North American and Japan only)

1986-1987 E23 L7 (136 kW, North American and Japan only)

1987 E24 L6 (North America only)

1987-1988 E28 535is (136 kW, North America only)

Without catalytic converter: 10.0:1 compression ratio, 218 metric horsepower (160 kW) - Europe and rest of the world

Applications:

1982-1986 E23 735i

1985-1988 E28 535i/M535i

Note: The following models use a variant of the M30 coined the M90. This engine is actually 3453cc and uses the same block as the BMW M88/S38 . It does, however, use a SOHC head and was regarded as the test horse platform before the production of the M88/S38 in order to determine if the "oversquare" engine setup would work reliably. The differentiation of this engine is coolant water passages on the side of the block (not otherwise seen on an M30B32/B34), and/or a white L stamped on the oil filter side of the block. It used both L-jetronic and Motronic injection systems, depending on the year.

Without catalytic converter: 9.3:1 compression ratio, 218 metric horsepower (160 kW) - Europe and rest of the world

1979-1981 E12 M535i

1978-1982 E24 635CSi

1978-1982 E23 735i