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The E30 M3 is the BMW Motorsport-developed version of the E30 3 Series. Its S14 four-cylinder powerplant is a further development of the M10 unit and was chosen by BMW because of its compact dimensions. The S14 engine powered the E30 M3 from 1986 to 1991.

The E30 M3's S14 engine was designed for racing applications and is therefore compact and high-revving. It combines the basic four-cylinder block from the M10 family with a four-valve head derived from the one used on the six-cylinder M88 and S38 motors. Special features of this engine include individual throttle plates for each cylinder, machined intake and exhaust ports, and a crankshaft with eight counterweights. Like the M88 and S38, the S14 does not have hydraulic lifters, and thus requires periodic valve adjustments.

The S14 engine developed 200 bhp, but a tuned variant with 220 bhp was created in 1989 in a small production run with the designation S14 EVO (for Evolution).

In Italy, BMW produced an 2.0-liter S14 version since cars with engines over 2.0 liters were subject to high taxes. To achieve 2.0 liters, the stroke was shortened to 72.6 mm.

In 1990, 600 vehicles were built with the S14 EVO2 engine. With a 95.5 mm bore and 87 mm stroke, the engine produced 238 bhp and competed successfully in the DTM German Touring Car Championships.

BMW E30 M3
Specifications
Engine DOHC 16-valve Inline 4
Displacement 2302 cc
Bore mm 93.4
Stroke mm 84.0
Compression Ratio 10.5:1
Horsepower @ RPM 192 @ 6750
Torque @ RPM 170 @ 4750
Fuel Injection Bosch Motronic
Fuel Tank 14.5 gal
 

links

Links

Performance Parts for your BMW 4-cylinder engine.

Repair Tips to keep your BMW 4-cylinder in top shape.

BMW engine and model codes.

Engine Technology:

Engine Cleaning. Be careful with your BMW 4-cylinder engine.

Wallpaper of BMW engines. More...

S14.net website.

E30M3Performance.com links to tech articles:

S14Performance website in German.



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