The timing belt is the belt that controls the camshafts in the engine, opening and closing valves at just the right time for smooth operation. The timing belt has teeth that turn the camshaft in time with the crankshaft.

Some cars and trucks use timing chains or gears, which are more durable. Precision registration and timing with no loss of high torque carrying capability. Minimal vibration and chordal effect. Positive slip-proof engagement. Wide speed range, is especially important when the entire speed range is developed from a single source.