BMW S14

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.<ref name="BMW Archive">Template:Cite web</ref> 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.<ref name="bmwmregistry1">Template:Cite web</ref>

Versions

Version	Displacement	Power	Torque	Year
S14B20	Template:Convert	Template:Convert at 6,900 rpm	Template:Convert at 4,900 rpm	1987-1990
S14B23	Template:Convert	Template:Convert at 6,750 rpm	Template:Convert at 4,750 rpm	1986–1989
		Template:Convert at 6,750 rpm	Template:Convert at 4,750 rpm	1986–1989
		Template:Convert at 6,750 rpm	Template:Convert at 4,600 rpm	1989–1991
S14B23 EVO2		Template:Convert at 6,750 rpm	Template:Convert at 4,750 rpm	1988-1990
S14B25 EVO3	Template:Convert	Template:Convert at 7,000 rpm	Template:Convert at 4,750 rpm	1989-1990

<ref>Template:Cite web</ref><ref name="M3 FAQ" />

S14B20

This version was only sold in Portugal and Italy.<ref name="bmwmregistry1"/> It has a displacement reduced to Template:Convert by shortening the stroke to Template:Convert.<ref>Template:Cite web</ref><ref>Template:Cite web</ref>

Applications:

• 1987-1990 E30 320iS (Italy and Portugal only)

S14B23

The E30 M3 was initially released with the Template:Convert S14B23 engine.<ref name="bmwheaven">Template:Cite web</ref> Versions equipped with a catalytic converter produced Template:Convert and 230 Nm.<ref name="bmwheaven" /> In April 1989, the Ravaglia and Cecotto limited edition M3s were released with a Template:Convert S14B23 that would in September, 1989 become the standard motor for the E30 M3.<ref name="M3 FAQ">Template:Cite web</ref>

Applications:

• 1986-1991 E30 M3

S14B23 EVO2

This update of the S14B23 produced Template:Convert, or Template:Convert if equipped with a catalytic converter.<ref name="bmwheaven" />

Applications:

• 1988-1990 E30 M3

S14B25 EVO3

In 1989, the displacement was enlarged to Template:Convert and this engine produced Template:Convert.<ref name="bmwheaven" />

Applications:

• 1989-1990 E30 M3

See also

• BMW
• List of BMW engines