| BMW N43 engine | |
| Production: | 2007-2011 |
| Configuration: | Inline-4 |
| Head: | Aluminium |
| Block: | Aluminium |
| Valvetrain: | DOHC, with VVT |
| Fueltype: | Petrol |
| Displacement: | 1599cc 1995cc |
| Bore: | 822NaN2 842NaN2 |
| Stroke: | 75.72NaN2 902NaN2 |
| Predecessor: | BMW N46/N45 |
| Successor: | BMW N13 |
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.[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.
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.
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| N43B16 | 15991NaN1 | 900NaN0 at 6,000 rpm | 1600NaN0 at 4,250 rpm | 2008-2011 |
| N43B20 | 19951NaN1 | 1850NaN0 at 3,000 rpm | 2007-2011 | |
| 1050NaN0 at 6,000 rpm | 1900NaN0 at 4,500 rpm | |||
| 1250NaN0 at 6,700 rpm | 2100NaN0 at 4,250 rpm |
The N43B16 has a displacement of 15991NaN1 and produces 900NaN0 and 1600NaN0.[3] It is the successor to the BMW N45 engine and, as per the N45, does not have Valvetronic.[4]
Applications:
The N43B20 has a displacement of 19951NaN1 and produces up to 1250NaN0 and 2100NaN0.[3] [4]
In 2009, the 19951NaN1 N43B20 replaced the 15991NaN1 N43B16 in the 116i. Power remained at 900NaN0, however torque was increased.
Applications:900NaN0 version
1050NaN0 version
1250NaN0 version