S38 S38B35 MPower 6 Cylinder built from 1986 to 1996
The BMW S38 is a straight-6 DOHC piston engine which replaced the M88 and was produced from 1986-1996. It is based on the M88/3 engine.
Based on the M88/3
The M88/1 engine was the BMW Racing engine of the time. It was modified for street use in the M635CSi and E28 M5, this engine was known as the M88/3 . The Kugelfisher fuel injection was replaced with Bosch Motronic and the engine produced 286 hp (213 kW). It has a compression ratio of 10.5:1.The North American Version was badged the S38.
The S38B35 was based on the M88/3, but with changes including a dual-row timing chain, camshaft, compression ratio lowered to 9.8:1 and fitted with a catalytic converter.
1986-1988 BMW M5 (E28) sedan (North America only)
1988-1989 E24 BMW M6 coupe
1987-1989 E24 M635CSi coupe
For the S38B36 displacement was enlarged from 3453 to 3535 cc, achieved by increasing the stroke from 84mm to 86mm by using a longer forged steel crankshaft. Different camshafts were also used and the compression ratio was increased to 10:1. A variable-length inlet manifold was used claimed to improve torque output, equal length stainless steel exhaust headers remains. The fuel injection system was Bosch Motronic.
1988-1992 E34 M5 sedan