Importance of Cam Gears in Internal Combustion Engines A cam is an important component of an internal combustion engine. Especially in an overhead-camshaft engine, the cam controls the opening and closing of valves. There are separate camshafts for fuel inlet and exhaust valves.
How it works: the engine crankshaft has a gear or sprocket fitted to its one end. A second shaft, called a camshaft, is placed close by which also has a gear or sprocket. Both gears are joined by a chain. Two turns of the crankshaft give one turn of the camshaft. Resting on the camshaft is a pushrod which moves up-and-down or backwards-and-forwards as the camshaft turns. Fitted on the top of the pushrod is a pivoted arm or rocker. One end of the rocker pushes down on the valve as the other is lifted by the pushrod. To return the valve to the closed position a coil spring is fixed to the top. This then gives the opening and closing system for the engine fuel supply. In the whole system explained above, the function of cam gears is to keep the camshaft rotating properly. A faulty cam gear (for example, one with a broken or distorted tooth) will affect the timing of the camshaft which in turn will make the engine misfire or stall completely. Revhead Parts has the wide range of cam gears, including HKS Cam Gear. For more details, visit the relevant products page on website and choose the suitable cam gear for your car.