BMW M43
| BMW M43 engine | |
|---|---|
 | |
| Overview | |
| Production | 1991–2002 |
| Layout | |
| Configuration | Inline-4 |
| Displacement | 1.6 L (1,596 cc) 1.8 L (1,796 cc) 1.9 L (1,895 cc) |
| Cylinder bore | 84 mm (3.31 in) 85 mm (3.35 in) |
| Piston stroke | 72 mm (2.83 in) 81 mm (3.19 in) 83.5 mm (3.29 in) |
| Cylinder block material | Cast iron |
| Cylinder head material | Aluminium |
| Valvetrain | SOHC |
| Combustion | |
| Fuel type | Petrol, CNG |
| Chronology | |
| Predecessor | BMW M40 |
| Successor | BMW N42 |
The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991-2002.[1] The M43 powered base-model cars, while higher performance models at the time were powered by the BMW M42 and BMW M44 DOHC engines. The M43 was produced at the Steyr engine plant.[2]
A version using natural-gas was produced for the E36 318i and the E34 518i.
Following the introduction of the BMW N42 engine in 2001, the M43 began to be phased out.
Design
[edit]Compared with its BMW M40 predecessor, the M43 features both a camshaft position sensor and a knock sensor[3] as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt).[4][5] It also features a dual length intake manifold[6] ("DISA"), to provide torque across a wider rev range.[7]
In 1998 the displacement was increased to 1,895 cc (115.6 cu in), increasing torque to 180 N⋅m (133 lb⋅ft) at 3900 rpm.[1]
Versions
[edit]| Version | Displacement | Power | Torque | Year | Note |
|---|---|---|---|---|---|
| M43B16 | 1,596 cc (97.4 cu in) | 75 kW (101 hp) at 5500 rpm |
150 N⋅m (111 lb⋅ft) at 3900 rpm |
1991-1999 | |
| 60 kW (80 hp) at 5500 rpm |
127 N⋅m (94 lb⋅ft) at 3900 rpm |
1995-2000 | CNG | ||
| M43B18 | 1,796 cc (109.6 cu in) | 85 kW (114 hp) at 5500 rpm |
168 N⋅m (124 lb⋅ft) at 3900 rpm |
1993 | |
| 74 kW (99 hp) at 5500 rpm |
142 N⋅m (105 lb⋅ft) at 3900 rpm |
1995-1996 | CNG | ||
| M43B19 | 1,895 cc (115.6 cu in) | 87 kW (117 hp) at 5500 rpm |
180 N⋅m (133 lb⋅ft) at 3900 rpm |
1998 | |
| 77 kW (103 hp) at 5300 rpm |
165 N⋅m (122 lb⋅ft) at 2500 rpm |
1999 |
M43B16
[edit]The 1,596 cc (97.4 cu in) M43B16 produces 75 kW (101 hp) and 150 N⋅m (111 lb⋅ft) of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system.[8] There was also a natural gas-powered version of this car (also able to run on petrol) for the 1995 BMW 316g Compact.
Applications:
Engine Management Systems:
- 1993-09/1995 Bosch Motronic 1.7.2
- 1995-09/1997 Bosch Motronic 1.7.3
- 1997-2000 BMS43
M43B18
[edit]The M43B18 has a 1,796 cc (109.6 cu in) displacement. It produces 85 kW (114 hp) and 124 lb⋅ft (168 N⋅m) and uses the Bosch Motronic 1.7.1 fuel injection system.[8] There was also a less powerful natural gas-powered version of this car (also able to run on petrol) for the BMW 518g Touring (E34). This model was only available for two years.
Applications:
M43B19
[edit]The M43B19 (also known as the "M43TÜ") is the largest M43 engine, with a displacement of 1,895 cc (115.6 cu in). It produces up to 87 kW (117 hp) and 180 N⋅m (133 lb⋅ft), and uses BMW's BMS 46 engine management system.[8] The 77 kW (105 PS) versions do not have the DISA intake manifold and also have a smaller camshaft compared to the 118 PS versions. Note the M43B16, M43B18 and the M43B19 (118 PS version) all have the same camshaft.
Applications— 77 kW (103 hp) and 165 N⋅m (122 lb⋅ft):
Applications— 87 kW (117 hp) and 180 N⋅m (133 lb⋅ft):
References
[edit]- ^ a b "Engine specifications for M43 engines". www.bmwheaven.com. Retrieved 3 March 2017.
- ^ "BMW M43 engine". www.australiancar.reviews. Retrieved 2 March 2017.
- ^ "Motorenkunde über BMW Motoren". www.bmw-syndikat.de (in German). Retrieved 2 March 2017.
- ^ "Timing and valve train-timing chain". www.bmwfans.info. Retrieved 3 March 2017.
- ^ "Timing and valve train-tooth belt". www.bmwfans.info. Retrieved 3 March 2017.
- ^ "BMW M40 and M43 Four Cylinder Engines". www.unixnerd.demon.co.uk. Archived from the original on 28 September 2015. Retrieved 3 March 2017.
- ^ "What is a DISA valve?". www.bimmerforums.com. Retrieved 24 February 2017.
- ^ a b c "BMW World - 4-Cylinder Engines". www.usautoparts.net. Archived from the original on 2 March 2014.