BMW M40
Reciprocating internal combustion engine
From Wikipedia, the free encyclopedia
The BMW M40 is an SOHC straight-four petrol engine which was produced from 1987–1994.[1][2] It served as BMW's base model four-cylinder engine and was produced alongside the higher performance BMW M42 DOHC four-cylinder engine from 1989 onwards.
- 1.6 L (1,596 cc)
- 1.8 L (1,796 cc)
| BMW M40 engine | |
|---|---|
| |
| Overview | |
| Manufacturer | BMW |
| Production | 1987–1994 |
| Layout | |
| Configuration | Naturally aspirated straight-4 |
| Displacement |
|
| Cylinder bore | 84 mm (3.31 in) |
| Piston stroke | 72 mm (2.83 in) 81 mm (3.19 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC |
| Combustion | |
| Fuel system | Fuel injection |
| Management | Bosch Motronic 1.3 or 1.7 |
| Fuel type | Petrol |
| Cooling system | Water cooled |
| Chronology | |
| Predecessor | BMW M10 |
| Successor | BMW M43 |
Compared with its M10 predecessor, the M40 uses a belt-driven camshaft,[3] 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,[4] and the E36 versions use Bosch Motronic 1.7.[5][6]
Following the introduction of the BMW M43 engine in 1991, the M40 began to be phased out.
Versions
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| M40B16- E30 version | 1,596 cc (97.4 cu in) | 73 kW (99 PS; 98 hp) at 5,500 rpm | 141 N⋅m (104 lb⋅ft) at 4,250 rpm | 1987 |
| M40B16- E36 version | 75 kW (102 PS; 101 hp) at 5,500 rpm | 143 N⋅m (105 lb⋅ft) at 4,250 rpm | 1991 | |
| M40B18- E30 version | 1,796 cc (109.6 cu in) | 83 kW (113 PS; 111 hp) at 5,500 rpm | 162 N⋅m (119 lb⋅ft) at 4,250 rpm | 1987 |
| M40B18- E36 version | 85 kW (116 PS; 114 hp) at 5,500 rpm | 165 N⋅m (122 lb⋅ft) at 4,250 rpm | 1991 |
M40B16
The M40B16 is a 1,596 cc (97.4 cu in) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 72 mm (2.8 in).[7] It produces 73 kW (98 hp) and 142 N⋅m (105 lb⋅ft).[8]
Applications:
- 1988–1994 316i (E30)
- 1990–1994 316i (E36)
- 1992–1993 Bertone Freeclimber 2
M40B18
The M40B18 is a 1,796 cc (109.6 cu in) version of the M40, which has a bore of 84 mm (3.3 in) and a stroke of 81 mm (3.2 in).[7] It produces 83 kW (113 PS) and 163 N⋅m (120 lb⋅ft).[6]
Applications:
- 1987–1994 318i (E30)
- 1992–1993 318i (E36)
- 1989-1994 518i (E34)