TLDR: The BMW M44 is a type of engine that was used in BMW cars from 1996 to 2000. It's a four-cylinder engine that was known for its performance and efficiency.

The BMW M44 engine is a type of internal combustion engine that was used in BMW cars from 1996 to 2000. It replaced the previous BMW M42 engine and was known for its performance and efficiency. The M44 engine was produced alongside the BMW M43 engine, but it was considered to be the higher performance option.

Compared to its predecessor, the M44 engine had some notable improvements. It had roller rocker arms, which helped reduce friction and improve efficiency. The engine displacement was increased from 1.8 to 1.9 liters, which provided more power. The M44 engine also had a dual length intake manifold, which helped improve mid-range power and torque.

The M44 engine had a cast iron block and an aluminum cylinder head, just like its predecessor. This combination of materials helped balance strength and weight, making the engine both durable and lightweight.

The M44 engine was available in different versions, with the main one being the M44B19. This version had a displacement of 1,895 cc and produced 103 kW (138 bhp) of power and 180 N⋅m (133 lb⋅ft) of torque. It was used in various BMW models, including the E36 318i, 318is, and 318ti, as well as the Z3 1.9.

In 2000, the M44 engine was replaced by the BMW N42 engine, which offered further improvements in performance and efficiency.

Overall, the BMW M44 engine was a popular choice for BMW enthusiasts due to its combination of performance, efficiency, and reliability.