Manual

The 2.5-liter M20B25 engine does not have a catalytic converter. When it was first introduced, it had a carburetor; later, Bosch added a fuel injection system. Bosch Motronic 1.1/1.3 was the engine management system. The capacity was raised after the B25 was upgraded in 1987. A catalyzed model with Motronic 1.3 engine management debuted in […]

Produced between 1983 and 1991, the 2.4-liter BMW M21 or M21D24 diesel engine was fitted to the company’s well-known models, the 3-Series in the rear of the E30 and the 5-Series in the rear of the E28 and E34. Both an atmospheric and a turbocharged version of this unit were available. The engine was installed […]

The 3.0-liter (2986 cc) M30 engine is known as the M30B30. The Bosch D-Jetronic mechanical fuel injection system was the first fuel-injected version of the 2,986 cc (182.2 cu in) M30, which made its debut in the E9 3.0 CSi in 1971. Bosch L-Jetronic electronic fuel injection replaced the previous fuel injection system in 1976. […]

The M30B34 engines with a 10.0:1 compression ratio and 160 kW (218 horsepower) were sold in Europe and the majority of other markets. The M30B34 produced 136 kW (185 hp) and had an 8.0:1 compression ratio in North America and Japan. The Bosch Motronic digital fuel injection system was used in every market. The stroke […]

The M30B35LE is a SOHC, two-valve, lower efficiency variant of the M88/1 engine, commonly referred to as the M90. The cylinder head is taken from the BMW M30 engine family, but it shares the same block, bore, and stroke as the M88. This engine has used both Bosch Motronic and Bosch L-Jetronic engine management systems […]

The 1988 release of the BMW M40B16 engine, a low-volume in-line 4-cylinder engine of the BMW M40 series, was based on the M40B18. It had a smaller-stroke crankshaft and additional pistons, but the connecting rods stayed the same. The intake manifold, throttle valve, spark plugs, and ECU are different in M40 1.6 compared to 1.8. […]

Developed in 1987 to replace the obsolete M10 series, the M40B18 is the older brother of the M40B16 and the first inline 4-cylinder engine in the M40 family. The engine is built around a cast-iron cylinder block with an 8-valve head, a single camshaft, and hydraulic lifters (the M40 does not require valve adjustment). The […]

Produced between 1994 and 2000, the 1.7-liter BMW M41 or M41D17 diesel engine was found in all of its various bodies but only on the 3-Series E36. The popular 6-cylinder M51 diesel engine shares 86% of its parts with this power unit. The engine was installed on: BMW 3-Series E36 in 1994 – 2000; BMW […]

Developed from the M40B18, the M42B18 is an inline four-cylinder engine. The new, more effective aluminum 16-valve cylinder head with two camshafts and an optimized combustion chamber is the primary difference between it and its predecessor. The M42 still uses hydraulic valve clearance compensators. The intake and exhaust valves have diameters of 33 mm and […]

The M43B16 engine, a 1.6-liter BMW engine of the M43 family (which also included the M43B18 and M43B19) that took the place of the M40B16, was developed based on the 1.8-liter M43B18, which introduced a crankshaft with a reduced piston stroke to 72 mm (was 81 mm). The new power unit had a lighter crankshaft, […]