What essential function does the flywheel perform in an engine?

The flywheel primarily functions to stabilize the rotation of the crankshaft in an engine. It does this by storing rotational energy and providing a smooth, continuous power delivery as the engine operates. When the engine's pistons move up and down, they cause fluctuations in the crankshaft's speed; the flywheel counters these fluctuations by maintaining momentum, which helps to ensure the crankshaft rotates smoothly, minimizing vibrations and enhancing overall engine performance.

This stabilization is crucial for smooth engine operation, particularly at lower speeds, where power delivery can be inconsistent. The flywheel’s mass helps absorb energy from the power strokes of the cylinders and release it during the other strokes, resulting in a more steady output of power. This smooth operation is essential for the proper functioning of the engine and for the comfort of the vehicle's occupants.