BMW S14

BMW S14
Overview
Production	1986-1991
Layout
Configuration	Inline-4
Displacement	2.0 L (1,990 cc) 2.3 L (2,302 cc) 2.5 L (2,467 cc)
Cylinder bore	93.4 mm (3.68 in) 95 mm (3.74 in)
Piston stroke	72.6 mm (2.86 in) 84 mm (3.31 in) 87 mm (3.43 in)
Cylinder block material	Cast iron
Cylinder head material	Aluminium
Valvetrain	DOHC
Combustion
Fuel type	Petrol
Chronology
Predecessor	None
Successor	None

The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3, E30 320iS, and E36 318i Super Touring. It is based on the BMW M10 block and what is essentially a shortened BMW S38 cylinder head.^[1] The direct successor to the S14 was the S42 based on the M42 engine. The S42 was a racing engine installed in the E36 320i for the German Super Tourenwagen Cup. There is no direct successor to the S14 for production BMWs, 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.^[2]