| BMW N43 engine | |
|---|---|
| Overview | |
| Production | 2007-2011 |
| Layout | |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,599 cc) 2.0 L (1,995 cc) |
| Cylinder bore | 82 mm (3.23 in) 84 mm (3.31 in) |
| Piston stroke | 75.7 mm (2.98 in) 90 mm (3.54 in) |
| Cylinder block material | Aluminium |
| Cylinder head material | Aluminium |
| Valvetrain | DOHC, with VVT |
| Combustion | |
| Fuel type | Petrol |
| Chronology | |
| 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. [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.
| Version | Displacement | Power | Torque | Year |
|---|---|---|---|---|
| N43B16 | 1,599 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 |
| N43B20 | 1,995 cc (121.7 cu in) | 185 N⋅m (136 lb⋅ft) at 3,000 rpm | 2007-2011 | |
| 105 kW (141 bhp) at 6,000 rpm | 190 N⋅m (140 lb⋅ft) at 4,500 rpm | |||
| 125 kW (168 bhp) at 6,700 rpm | 210 N⋅m (155 lb⋅ft) at 4,250 rpm |
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:
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:90 kW (121 bhp) version
105 kW (141 bhp) version
125 kW (168 bhp) version