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The BMW M40 is an SOHC four-cylinder 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
M40B16.JPG
Overview
Production1987–1994
Layout
ConfigurationInline-4
Displacement1.6–1.8 L (98–110 cu in)
Block materialCast iron
Head materialAluminium
ValvetrainSOHC
Combustion
Fuel typePetrol
Chronology
PredecessorBMW M10
SuccessorBMW 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.

VersionsEdit

Version Displacement Power Torque Year
M40B16
E36 version
1,596 cc (97.4 cu in) 75 kW (101 bhp)
at 5,500 rpm
143 N⋅m (105 lb⋅ft)
at 4,250 rpm
1987
M40B16
E30 version
73 kW (98 bhp)
at 5,500 rpm
141 N⋅m (104 lb⋅ft)
at 4,250 rpm
1991
M40B18
E36 version
1,796 cc (109.6 cu in) 85 kW (114 bhp)
at 5,500 rpm
165 N⋅m (122 lb⋅ft)
at 4,250 rpm
1987
M40B18
E30 version
83 kW (111 bhp)
at 5,500 rpm
162 N⋅m (119 lb⋅ft)
at 4,250 rpm
1991

M40B16Edit

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 76 kW (102 bhp) and 142 N⋅m (105 lb⋅ft).[8]

Applications:

M40B18Edit

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 84 kW (113 bhp) and 163 N⋅m (120 lb⋅ft).[6]

Applications:

  • 1987–1994 E30 318i
  • 1988–1994 E34 518i
  • 1992–1993 E36 318i

ReferencesEdit

  1. ^ "BMW M40B18 automotive engine". bmw-grouparchiv.de. Retrieved 15 August 2019.
  2. ^ "BMW M40B16 automotive engine". bmw-grouparchiv.de. Retrieved 15 August 2019.
  3. ^ "M40 - E30 Zone Wiki". www.e30zone.net. Retrieved 27 January 2017.
  4. ^ "3' E30 318i Uncoded DME control unit". www.realoem.com. Retrieved 1 February 2017.
  5. ^ "3' E36 318i Uncoded DME control unit". www.realoem.com. 27 October 1975. Retrieved 1 February 2017.
  6. ^ 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.
  7. ^ a b "BMW M40 and M43 Four Cylinder Engines". www.unixnerd.demon.co.uk. Retrieved 10 February 2017.
  8. ^ "BMW Heaven Specification Database | Engine specifications for M40 engines". www.bmwheaven.com. Retrieved 2012-05-29.

See alsoEdit