BMW M40

BMW M40 engine
Overview
ManufacturerBMW
Production1987–1994
Layout
ConfigurationNaturally aspirated straight-4
Displacement
  • 1.6 L (1,596 cc)
  • 1.8 L (1,796 cc)
Cylinder bore84 mm (3.31 in)
Piston stroke72 mm (2.83 in)
81 mm (3.19 in)
Cylinder block materialCast iron
Cylinder head materialAluminium
ValvetrainSOHC
Combustion
Fuel systemFuel injection
ManagementBosch Motronic 1.3 or 1.7
Fuel typePetrol
Cooling systemWater cooled
Chronology
PredecessorBMW M10
SuccessorBMW M43

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.

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 (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).[7] It produces 73 kW (98 hp) and 142 N⋅m (105 lb⋅ft).[8]

Applications:

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 (111 hp) and 163 N⋅m (120 lb⋅ft).[6]

Applications:

  • 1987–1994 E30 318i.
  • 1992–1993 E36 318i

See also

References

  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. Archived from the original on 4 October 2008. 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.{{cite web}}: CS1 maint: numeric names: authors list (link)
  7. ^ 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.
  8. ^ "BMW Heaven Specification Database | Engine specifications for M40 engines". www.bmwheaven.com. Retrieved 2012-05-29.

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