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.
| 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
edit| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| M40B16- E30 version |
1,596 cc (97.4 cu in) | 73 kW (98 hp) at 5,500 rpm |
141 N⋅m (104 lb⋅ft) at 4,250 rpm |
1987 |
| M40B16- E36 version |
75 kW (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 (111 hp) at 5,500 rpm |
162 N⋅m (119 lb⋅ft) at 4,250 rpm |
1987 |
| M40B18- E36 version |
85 kW (114 hp) at 5,500 rpm |
165 N⋅m (122 lb⋅ft) at 4,250 rpm |
1991 |
M40B16
editThe 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 E30 316i
- 1990–1994 E36 316i
- 1992–1993 Bertone Freeclimber 2
M40B18
editThe 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 (111 hp) and 163 N⋅m (120 lb⋅ft).[6]
Applications:
- 1987–1994 E30 318i.
- 1992–1993 E36 318i
See also
editReferences
edit- ^ "BMW M40B18 automotive engine". bmw-grouparchiv.de. Retrieved 15 August 2019.
- ^ "BMW M40B16 automotive engine". bmw-grouparchiv.de. Retrieved 15 August 2019.
- ^ "M40 - E30 Zone Wiki". www.e30zone.net. Archived from the original on 4 October 2008. Retrieved 27 January 2017.
- ^ "3' E30 318i Uncoded DME control unit". www.realoem.com. Retrieved 1 February 2017.
- ^ "3' E36 318i Uncoded DME control unit". www.realoem.com. 27 October 1975. Retrieved 1 February 2017.
- ^ a b Roy McNeill, Copyright BMW World 1999–2005. "BMW World – 4-Cylinder Engines". Usautoparts.net. Archived from the original on 2014-03-02. Retrieved 2012-05-29.
{{cite web}}: CS1 maint: numeric names: authors list (link) - ^ a b "BMW M40 and M43 Four Cylinder Engines". www.unixnerd.demon.co.uk. Archived from the original on 28 September 2015. Retrieved 10 February 2017.
- ^ "BMW Heaven Specification Database | Engine specifications for M40 engines". www.bmwheaven.com. Retrieved 2012-05-29.