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The BMW S14 is a 2.3 L (2302cc) DOHC 16-valve I4 piston engine. It was used in the E30 M3. The S14 is essentially a BMW M10 engine block with a M88/S38 DOHC cylinder head (minus two cylinders). It has four separate throttle bodies. It developed 195 PS (143 kW/192 hp), or 200 PS (147 kW/197 hp) without a catalytic converter. A special tuned model, the S14 EVO producing 20 PS more. The 2.3 L version has a 93.4 mm bore and 84mm stroke.

Variations of this engine included a limited-edition 2.5 L (2467 cc) Sport Evo for motorsport homologation requirements, and a 2.0 L (1990cc) version with stroke reduced to 72.6 mm (often described incorrectly as being "sleeved" or of reduced bore) for the 320is, a sports model made specifically for the Portuguese and Italian markets. The 320is can be quickly distinguished from the E30 M3 by the absence of flared wheel arches.

External links

S14 2.5L Rebuild

BMW E30 320iS Specification