How Does a Camshaft Work?

The camshaft is the core component of the engines valve train, enabling precise control of intake and exhaust by driving the valves. It is typically driven by the engines crankshaft via a timing belt or chain and rotates synchronously with the crankshaft at a specific phase.

The camshaft has multiple cams, each corresponding to a valve. As the camshaft rotates, the cams push on tappets, rocker arms, and other transmission mechanisms, causing the valves to open or close at set times, thereby completing the intake of air and fuel and the exhaust of waste gases.

The design of the camshaft directly affects the engines performance and efficiency. Cams of different shapes and phases can change the timing and duration of valve opening, thereby optimizing power output, fuel economy, and emission levels.