What is a rocker arm?

A rocker arm is a component in an internal combustion engine that transfers the motion of the camshaft to the valves. It is typically made of hardened steel and is pivotally mounted on one end while the other end makes contact with the valve stem or pushrod.

The rocker arm has a specific ratio which determines the amount of lift and duration that the valve is open. This ratio is important for optimizing engine performance and efficiency.

Rocker arms can be either stamped or cast, with roller rockers being a popular aftermarket upgrade. Roller rockers reduce friction and wear, allowing for smoother operation and potentially increased horsepower.

Regular maintenance and inspection of rocker arms is important to ensure proper valve operation and prevent premature wear and failure. Symptoms of a worn rocker arm may include noisy valve operation, poor performance, or engine misfires.

Overall, rocker arms play a critical role in the operation of an internal combustion engine and should be carefully maintained to ensure optimal performance and longevity.