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The flywheel is a crucial component in the operation of a vehicle's engine, especially in heavy-duty applications like trucks. Essentially, it's a mechanical device that stores rotational energy. Its primary function is to smooth out fluctuations in engine speed, providing inertia to keep the engine running smoothly between power strokes.

In trucks, the flywheel serves multiple purposes, including aiding in smooth engine startup, providing momentum for rotational machinery like the transmission and auxiliary systems, and helping to balance the engine's operation. Additionally, the flywheel plays a vital role in the vehicle's drivetrain, connecting the engine to the transmission and ultimately to the wheels, ensuring power delivery is consistent and efficient.