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BMW M42The BMW M42 is a DOHC 16-valve I4 piston engine first built for the E30 318is 1989 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.
Displacement for the M42B18 was 1.8 L (1796 cc). 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.
The M42 is a great engine swap for 2002's and E21's. It makes for a relatively inexpensive swap, and produces quite a bit more useable more power than the M10's while still being lighter, plus utilizing modern EFI and direct-ignition and a much improved valvetrain.
Further, the long-stroke forged crankshaft from the M47 motor (See BMW M47) coupled with an overbore of +2mm will make for a 2.1L Stroker M42. The 86mm pistons from a European 3.0L S50 will produce a high compression, stroker M42 when coupled with the M47 crank. The addition of a MAF conversion from an M50 engine and properly setup cams, valvetrain, and tuning will yield potent output from the "lowly" M42.
Models 1898Engine M42B18
Year 1989
Displacement 1.8 L (1796 cc/109 in³)
Power100 kW (136 PS) @ 6000
Torque 172 N·m (127 ft·lbf) @ 4600
Redline 6500 rpm
Year 1992 Displacement 1.8 L (1796 cc/109 in³)
Power 103 kW (140 PS) @ 6000
Torque 175 N·m (129 ft·lbf) @ 4500
Redline 6300 rpm
BMW M44 The BMW M44 is a DOHC 16-valve I4 piston engine. It replaced BMW's previous multi-valve four-cylinder, the BMW M42 and was related to the lesser 8-valve BMW M43.
Models 1996Engine M44B19
Year 1996
Displacement 1.9 L (1895 cc/115 in³)
Power 103 kW (138 hp) @ 6000
Torque 180 N·m (133 ft·lbf) @ 4300
Redline 6500 rpm
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