BMW M40

BMW M40
BMW M40
Overview
Manufacturer	BMW
Production	1987–1995
Layout
Configuration	SOHC Straight-4
Displacement	1.6 L (1596 cc; 97.4 cu in); 1.8 L (1796 cc; 109.6 cu in);
Chronology
Predecessor	BMW M10
Successor	BMW M43

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,^[1] 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,^[2] and the E36 versions use Motronic 1.7.^[3]

Models

Engine	Displacement	Power	Torque	Redline	Year
M40B16 E36 version	1.6 L	75 kW (101 hp) @ 5,500 rpm	143 N⋅m (105 lb⋅ft) @ 4,250 rpm	6200	1987
M40B16 E30 version	1.6 L	73 kW (98 hp) @ 5,500 rpm	141 N⋅m (104 lb⋅ft) @ 4,250 rpm	6200	1991
M40B18 E36 version	1.8 L	85 kW (114 hp) @ 5,500 rpm	165 N⋅m (122 lb⋅ft) @ 4,250 rpm	6200	1987
M40B18 E30 version	1.8 L	83 kW (111 hp) @ 5,500 rpm	162 N⋅m (119 lb⋅ft) @ 4,250 rpm	6200	1991

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).^[4] It produces 102 hp (76 kW) and 105 lb⋅ft (142 N⋅m) of torque.^[5] The E30 version uses Bosch Motronic 1.3 fuel injection, while the E36 version uses Motronic 1.7.^[6]

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).^[4] It produces 113 hp (84 kW) and 120 lb⋅ft (160 N⋅m) of torque.^[6] Like the M40B16, the fuel injection system is Bosch Motronic 1.3 for the E30 versions and Motronic 1.7 for the E36.