HIGHER PERFORMANCE M40 DOHC FOUR-CYLINDER ENGINE
The BMW M40 is an inline-four SOHC piston engine which replaced the M10 and was produced from 1987–1995. Displacement ranges from 1.6 L to 1.8 L. It began to be replaced by the M43 SOHC engine in 1991, however from 1989 the M40 was produced alongside the higher performance M42 DOHC four-cylinder engine.
Compared with its M10 predecessor, the M40 uses a belt-driven camshaft, and hydraulic tappets. Like the M10, the M40 uses an iron block and an aluminium head.
Fuel injection for the E30 versions is Bosch Motronic 1.3, and the E36 versions use Motronic 1.7
| Engine | Displacement | Power | Torque | Redline | Year |
| M40B16 | 1,596 cc (97.4 cu in) | 75 kW (101 hp) | 143 N·m (105 lb·ft) | 6200 | 1987 |
| E30 version | @ 5,500 rpm | @ 4,250 rpm | |||
| M40B16 | 73 kW (98 hp) | 141 N·m (104 lb·ft) | 6200 | 1991 | |
| E36 version | @ 5,500 rpm | @ 4,250 rpm | |||
| M40B18 | 1,796 cc(109.6 cu in) | 85 kW (114 hp) | 165 N·m (122 lb·ft) | 6200 | 1987 |
| E30 version | @ 5,500 rpm | @ 4,250 rpm | |||
| M40B18 | 83 kW (111 hp) | 162 N·m (119 lb·ft) | 6200 | 1991 | |
| E36 version | @ 5,500 rpm | @ 4,250 rpm |
M40B16
The M40B16 is a 1.6 L (1,596 cc) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 72 mm (2.8 in). It produces 102 hp (76 kW) and 105 lb·ft (142 N·m) of torque. The E30 version uses Bosch Motronic 1.3 fuel injection, while the E36 version uses Motronic 1.7
Applications:
1988–1994 E30 316i
1990–1994 E36 316i
1992–1993 Bertone Freeclimber 2
M40B18
The M40B18 is a 1.8 L (1,796 cc) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 81 mm (3.2 in). It produces 113 hp (84 kW) and 120 lb·ft (160 N·m) of torque. Like the M40B16, the fuel injection system is Bosch Motronic 1.3 for the E30 versions and Motronic 1.7 for the E36.
Applications: