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TLDR: The BMW M43 is a type of engine that was used in BMW cars from 1991 to 2002. It is a four-cylinder engine that comes in different sizes and has some special features.

The BMW M43 engine is a type of engine that was used in BMW cars from 1991 to 2002. It is a four-cylinder engine, which means it has four cylinders where the fuel is burned to create power. The M43 engine comes in different sizes, ranging from 1.6 liters to 1.9 liters. The size of the engine affects how much power it can produce.

One interesting thing about the M43 engine is that it has a single overhead camshaft (SOHC), which controls the opening and closing of the engine's valves. This helps the engine run more efficiently and produce more power. The M43 engine also has a dual length intake manifold, which helps provide torque (or twisting power) across a wider range of engine speeds.

The M43 engine was used in base-model BMW cars, while higher performance models at the time were powered by different engines. The M43 engine was produced at the Steyr engine plant. There was also a version of the M43 engine that could run on natural gas, which was used in some BMW models.

Compared to its predecessor, the BMW M40 engine, the M43 engine has some improvements. It has a camshaft position sensor and a knock sensor, which help the engine run more smoothly and prevent damage. The M43 engine also has roller rockers and a timing chain, which are more durable than the finger rockers and timing belt used in the M40 engine.

Overall, the BMW M43 engine is a reliable and efficient engine that was used in BMW cars for over a decade. It has different sizes and features that help it produce power and run smoothly.

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