BMW M43
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| Manufacturer | BMW |
|---|---|
| Production | 1991–2002 |
| Predecessor | BMW M40 |
| Successor | BMW N42 |
| Configuration | SOHC Straight-4 |
The BMW M43 is a straight-4 piston engine. Displacement ranges from 1600 cc to 2000 cc.
The engine was built solely on Assembly Line 2 at Steyr, and was the successor to the M40.
It features ICIM (Individual Control Intake Manifold) and 2-valve technology. The ICIM optimizes the torque curve and is also aided by anti-knock control. Like the 16-valve, 4-cylinder M42 engine and the 6 and 8-cylinder engines, stationary high-voltage distribution is also used on the M43. The M40's timing belt was replaced by a chain as the high engine bay temperatures reduced the lifespan of the belt. Engine ratings were slightly raised while exhaust levels and fuel efficiency were significantly improved.
A further technical revision occurred in 1998. The displacement capacity was increased to 1.9 litres, resulting in improved torque of 180 Nm at 3900 rpm. The intake manifold was also constructed of plastic for added weight savings.
From 1993 to 2001 a total of 1,204,734 units came off the production line, making this the Steyr plant's highest-production engine.
| Engine | Displacement | Power | Torque | Redline | Year |
|---|---|---|---|---|---|
| M43B16 | 1.6 L (1596 cc/97 in³) | 75 kW (101 hp) @ 5500 | 150 N·m (111 lb·ft) @ 3900 | 6200 | 1991 |
| M43B18 | 1.8 L (1796 cc/109 in³) | 85 kW (114 hp) @ 5500 | 168 N·m (124 lb·ft) @ 3900 | 6200 | 1993 |
| M43TUB19 | 1.9 L (1895 cc/115 in³) | 87 kW (118 hp) @ 5500 | 180 N·m (133 lb·ft) @ 3900 | 6200 | 1998 |
| 77 kW (103 hp) @ 5300 | 165 N·m (122 lb·ft) @ 2500 | 6200 | 1999 |
[edit] M43B16
A 1.6 L (1596cc) M43B16 produces 75 kW (102 hp) and 150 N·m (111 lb·ft) with Bosch M1.7.1 fuel injection.
Applications:
- 1993-1999 E36 316i
- 1994-1998 E36 316i Compact
[edit] M43B18
The M43B18 was a 1.8 L (1796cc) version. It produced 85 kW (115 hp) and 168 N·m (124 lb·ft) with Bosch M1.7.1 fuel injection.
Applications:
[edit] M43B19
The 1.9 L (1895cc) M43B19 was the largest M43 engine. It produced 87 kW (118 hp) and 180 N·m (133 lb·ft) or 77 kW (105 hp) and 165 N·m (122 lb·ft). It used BMW BMS 46 fuel injection.
It's also known as M43 TÜ engine. It had twin-balancing shafts.
Applications:
- 87 kW (118 hp) and 180 N·m (133 lb·ft)
- 1998-2001 E46 318i/318Ci
- 2001-2003 BMW E36 Z3 1.9
- 77 kW (105 hp) and 165 N·m (122 lb·ft)
- 1999-2000 E36 316i compact
- 1998-2001 E46 316i
