The E30 M3 used the BMW S14 four-cylinder engine, a high-revving DOHC design with a head closely based on that of the BMW S38 six-cylinder engine and the block from the BMW M10 four-cylinder engine with a 7,250 rpm redline. In countries where the M3 was sold with a catalytic converter, the initial versions were rated at 143 kW (195 PS 192 hp) and had a top speed of 235 km h (146 mph). In countries where a catalytic converter was not fitted, the engine was rated at 147 kW (200 PS 197 hp). The BMW S14 is a DOHC four-cylinder petrol engine which was used in the E30 M3, E30 320iS, and E36 318i Super Touring.

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