BMW S14


The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3. It is based on the BMW M10 block and the cylinder head from the six-cylinder BMW S38 with two cylinders removed. There is no direct successor to the S14, since the following generation of M3 is powered by the BMW S50 six-cylinder engine.
Two separate throttle bodies are used, each incorporating two throttle butterfly plates.

Versions

S14B20

This version was only sold in Portugal and Italy. It has a displacement reduced to by shortening the stroke to.
Applications:
The E30 M3 was initially released with the S14B23 engine. Versions equipped with a catalytic converter produced and 230 Nm. In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a S14B23 that would in September, 1989 become the standard motor for the E30 M3.
Applications:
This update of the S14B23 produced, or if equipped with a catalytic converter.
Applications:
In 1989, the displacement was enlarged to and this engine produced.
Applications: