BMW M43

The BMW M43 is an SOHC four-cylinder petrol engine which was produced from 1991 to 2002.<ref name="bmwhaven">Template:Cite web</ref> 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.<ref>Template:Cite web</ref>

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

Compared with its BMW M40 predecessor, the M43 features both a camshaft position sensor and a knock sensor<ref>Template:Cite web</ref> as well as roller rockers and a timing chain (instead of the M40's finger rockers and timing belt).<ref>Template:Cite web</ref><ref>Template:Cite web</ref> It also features a dual length intake manifold<ref>Template:Cite web</ref> ("DISA"), to provide torque across a wider rev range.<ref>Template:Cite web</ref>

In 1998 the displacement was increased to Template:Convert, increasing torque to Template:Convert at 3900 rpm.<ref name="bmwhaven" />

Versions

Version	Displacement	Power	Torque	Year	Note
M43B16	Template:Convert	Template:Convert at 5500 rpm	Template:Convert at 3900 rpm	1991-1999
		Template:Convert at 5500 rpm	Template:Convert at 3900 rpm	1995-2000	CNG
M43B18	Template:Convert	Template:Convert at 5500 rpm	Template:Convert at 3900 rpm	1993
		Template:Convert at 5500 rpm	Template:Convert at 3900 rpm	1995-1996	CNG
M43B19	Template:Convert	Template:Convert at 5500 rpm	Template:Convert at 3900 rpm	1998
		Template:Convert at 5300 rpm	Template:Convert at 2500 rpm	1999

M43B16

The Template:Convert M43B16 produces Template:Convert and Template:Convert of torque. It uses the Bosch Motronic 1.7.x and Bosch BMS43 engine management system.<ref name="usautoparts">Template:Cite web</ref> 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 Template:Convert displacement. It produces Template:Convert and Template:Convert and uses the Bosch Motronic 1.7.1 fuel injection system.<ref name="usautoparts" /> 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 Template:Convert. It produces up to Template:Convert and Template:Convert, and uses BMW's BMS 46 engine management system.<ref name="usautoparts" /> The Template:Convert 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— Template:Convert and Template:Convert:

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

Applications— Template:Convert and Template:Convert:

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

See also

• List of BMW engines