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High Quality Content by WIKIPEDIA articles! The BMW M42 is a DOHC 16-valve I4 piston engine first built for the E30 318is and 318i 1991 year model. The engine block is based on the BMW M40, used on the 318i, but had distinctive features such as double overhead cams driven by a timing chain, hydraulic valve lifters, and an increased 10:1 compression ratio. The USA version of the 1991 318i only came with the M42 engine. Profile gaskets on M42s built before 1993 are known to fail prematurely. Displacement for the M42B18 was 1.8 L (1796 cc); cylinder bore was 84 mm; and stroke was 81 mm. E30 318iS, 318i (in the U.S.; European versions of the 318i were fitted with the M40 engine), and early E36 318iS/318ti (prior to 1992) models were fitted with versions producing 100 kW (134 hp) and 172 N m (127 ft lbf). Later, change in the overhead cam design helped to achieve 103 kW (138 hp) and 175 N m (129 ft lbf) coping with the increased weight of the E36 models. The engine uses Bosch M1.7 fuel injection.