BMW M43

BMW M43 engine
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

Last updated April 28, 2024

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]

Design

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

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
M43B16	1,596 cc (97.4 cu in)	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
M43B18	1,796 cc (109.6 cu in)	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
M43B19	1,895 cc (115.6 cu in)	77 kW (103 hp) at 5300 rpm	165 N⋅m (122 lb⋅ft) at 2500 rpm	1999

M43B16

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:

1994-1998 E36 316i
1995-2000 E36/5 316g Compact
1998-1999 E46 316i

Engine Management Systems:

1993-09/1995 Bosch Motronic 1.7.2
1995-09/1997 Bosch Motronic 1.7.3
1997-2000 BMS43

M43B18

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:

1992-1998 E36 318i
1994-1996 E34 518i
1995-1996 E34 518g Touring
1995-2001 Z3 1.8

M43B19

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):

1999-2001 E36 316i Compact
1999-2002 E46 316i

Applications— 87 kW (117 hp) and 180 N⋅m (133 lb⋅ft):

1998-2001 E46 318i/318Ci
1999 -2002 Z3 1.9

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References

1 2 "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.
1 2 3 "BMW World - 4-Cylinder Engines". www.usautoparts.net. Archived from the original on 2 March 2014.