BMW N43

The BMW N43 is a naturally aspirated four-cylinder petrol engine which was sold from 2006-2013. It replaced both the BMW N46 and BMW N45 engines.[1] However the N43 was not sold in countries with high sulfur fuel,[2] therefore the N45/N46 engines remained in production alongside the N43.

BMW N43 engine
Overview
Production2007-2011
Layout
ConfigurationInline-4
Displacement1.6–2.0 L (98–122 cu in)
Block materialAluminium
Head materialAluminium
ValvetrainDOHC, with VVT
Combustion
Fuel typePetrol
Chronology
PredecessorBMW N46/N45
SuccessorBMW N13

Compared with its N46 predecessor, the N43 features direct injection.[3]

In 2011, as part of BMW's shift to turbocharging, the N43 was replaced by the BMW N13 turbocharged four-cylinder engine. The N43 suffered various problems in service - breakage of the cam chain plastic guides leading to oil starvation as the debris blocked the oil strainer, and problems with the injectors, coil packs and the NOx sensor.

Versions

VersionDisplacementPowerTorqueYear
N43B161,599 cc (97.6 cu in)90 kW (121 bhp)
at 6,000 rpm
160 N⋅m (118 lb⋅ft)
at 4,250 rpm
2008-2011
N43B201,995 cc (121.7 cu in)185 N⋅m (136 lb⋅ft)
at 3,000 rpm
2007-2011
110 kW (148 bhp)
at 6,000 rpm
200 N⋅m (148 lb⋅ft)
at 4,500 rpm
125 kW (168 bhp)
at 6,700 rpm
210 N⋅m (155 lb⋅ft)
at 4,250 rpm

N43B16

The N43B16 has a displacement of 1,599 cc (97.6 cu in) and produces 90 kW (121 bhp) and 160 N⋅m (118 lb⋅ft).[3] It is the successor to the BMW N45 engine and, as per the N45, does not have Valvetronic.[4]

Applications:

  • 2007-2009 E87 116i
  • 2008 E90 316i

N43B20

The N43B20 has a displacement of 1,995 cc (121.7 cu in) and produces up to 125 kW (168 bhp) and 210 N⋅m (155 lb⋅ft).[3][4]

In 2009, the 1,995 cc (121.7 cu in) N43B20 replaced the 1,599 cc (97.6 cu in) N43B16 in the 116i. Power remained at 90 kW (121 bhp), however torque was increased.

Applications:mariefren 90 kW (121 bhp) version

110 kW (148 bhp) version

125 kW (168 bhp) version

See also

References

  1. "BMW 116i now powered by 2.0L N46 Valvetronic". www.paultan.org. Retrieved 3 June 2012.
  2. "BMW N43, N45 and N46 Four Cylinder Valvetronic Engines". www.unixnerd.demon.co.uk. Retrieved 1 April 2017.
  3. "Engine specifications for N43 engines". www.bmwheaven.com. Retrieved 3 June 2012.
  4. "BMW N43B16 Engine". www.mywikimotors.com. Retrieved 1 April 2017.
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