What is the primary purpose of an engine's flywheel?

The primary purpose of an engine's flywheel is to smooth out the power delivery from the engine and store rotational energy. The flywheel functions as a mechanical device that helps maintain a steady rotating motion during the engine's power strokes. As the engine operates, it produces power in bursts; the flywheel stores energy during these peaks and releases it during the troughs, which leads to smoother overall engine operation.

This smoothing effect is crucial because it helps reduce vibrations and prevents the engine from experiencing abrupt changes in speed, which can lead to instability in driving feel or performance. Additionally, by storing rotational energy, the flywheel contributes to a more consistent torque output, which is particularly beneficial during acceleration and deceleration. The stored energy also aids in keeping the engine running smoothly when the power strokes occur, resulting in more efficient and balanced engine performance.