| 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 |
The BMW M40 is an SOHC straight-four petrol engine which was produced from 1987–1994. 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.
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 Bosch Motronic 1.7.
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 (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
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). It produces 73 kW (98 hp) and 142 N⋅m (105 lb⋅ft).
Applications:
- 1988–1994 E30 316i
- 1990–1994 E36 316i
- 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). It produces 83 kW (111 hp) and 163 N⋅m (120 lb⋅ft).
Applications:
- 1987–1994 E30 318i.
- 1992–1993 E36 318i
See also
References
- "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.
- ^ 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) - ^ "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.
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