BMW N43


The BMW N43 is a naturally aspirated four-cylinder petrol engine which was sold from 2006 to 2013. It replaced both the BMW N46 and BMW N45 engines. However the N43 was not sold in countries with high sulfur fuel, therefore the N45/N46 engines remained in production alongside the N43.
Compared with its N46 predecessor, the N43 features direct injection.
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

N43B16

The N43B16 has a displacement of and produces and. It is the successor to the BMW N45 engine and, as per the N45, does not have Valvetronic.
Applications:
  • 2007-2009 E87 116i
  • 2008 E90 316i

    N43B20

The N43B20 has a displacement of and produces up to and.
In 2009, the N43B20 replaced the N43B16 in the 116i and 316i. Power remained at, however torque was increased.
Applications:
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