BMW M43 was produced from 1991 to 2002. Engine displacement ranges from 1.6 to 2.0 L. It is an usual straight-4 SOHC piston engine. E36 M43 has dual-path intake manifold unlike its predecessor M40. The system called Individual Control E36 Intake Manifold by BMW and used to provide torque across a wider rev range.
M43 was produced till 2002. The reason for such a long use of this engine is the ideal design, low manufacturing cost and high Assembly quality.
SOHC system, which is the basis of e36 M43, has one camshaft with two valves per cylinder. Chain drive causes the camshaft to move, unlike the previous series engine M40 that used a belt.
The gas mechanism consists of leading and driven sprockets, tensioner and damper. Lubrication of the elements of the system is methods to pull the Timing Chain through the crankcase with oil to the bottom edge of the drive sprocket. Oil gets other parts on the chain links. The tension control is performed when carrying out service maintenance.
In the design of the intake manifold bmw e36 m43 introduces the concept of changing its geometry, thus ensuring the stability of torque in different modes of engine operation. At low crankshaft speeds the maximum values are achieved with long intake manifold, if you increase the rpm the system switches the air supply on a short piece. The system, developed by engineers of the company, acquired its own name as an abbreviation for DIVA.
From the beginning this engine was equipped with fuel injection system from German corporations such as Bosch. The injector Motronic 1.7.1 established itself as a reliable and low-maintenance system that provides the optimal parameters of its work. In the digital block have been combined function of control characteristics and direct control of fuel delivery and ignition of the mixture in the cylinders.In the use of cars with engines of BMW E36 m43 were identified and corrected a number of deficiencies that were not critical, but still spoiled the overall picture. So, in the first m43 was a weak pump and the tensioner mechanism. But overall, the company managed to make a very good and reliable power unit.
The M43B16 engine
The 1.6 L (engine size 1596cc) BMW M43B16 produces 102hp (75kW) at 5500rpm and 150Nm torque at 3900rpm. It uses the Bosch Motronic 1.7.1 fuel injection system. The maximum speed of the crankshaft is 6200 rpm
The engine BMW M43B16 Applications:
- 1993-1999 E36 316i
- 1994-1998 E36 316i Compact
- 1998-2002 E46 316i
The M43B18 engine
The 1.8 L (engine size 1796cc) BMW M43B18 produces 115hp (85kW) at 5500rpm and 168Nm torque at 3900rpm.
The engine BMW M43B18 Applications:
- 1992-1998 E36 318i
- 1994-1996 E34 518i
- 1995-2001 E36 Z3 1.8
The M43TU engine
The M43TU (or M43B19) is the largest M43 engine, with a displacement of 1895cc. It produces up to 118 hp and 180 Nm torque and uses BMW BMS 46 fuel injection system.
The engine BMW M43B19 Applications:
- 1998-2001 E46 318i/318Ci
- 2001-2003 BMW E36 Z3 1.9