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.

N43B16
The N43B16 has a displacement of 1599 cc and produces 90 kW and 160 Nm. 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 1995 cc and produces up to 125 kW and 210 Nm.

In 2009, the 1995 cc N43B20 replaced the 1599 cc N43B16 in the 116i. Power remained at 90 kW, however torque was increased.

Applications: 90 kW version
 * 2007-2011 E81/E87 116i

105 kW version
 * 2007-2011 E90/E91/E92/E93 318i
 * 2008-2011 E81/E87/E88 118i

125 kW version
 * 2007-2011 E81/E82/E87/E88 120i
 * 2007-2011 E90/E91/E92/E93 320i
 * 2007-2009 E60/E61 520i