The camshaft is the valve control for the engine and therefore determines the flow of intake and exhaust gases. The camshaft(s) is (are) driven by the timing belt or timing chain. Most modern engines have overhead camshafts which are mounted in the cylinder head. Some older and some American engines still work with a single underlying camshaft in which the valve is operated by push rods. The camshaft rotates, with the cams taking care of the valve operation and thus the opening of the valves. When the camshaft rotates further, the valve spring closes the valve. The sharpness and height of the cams determine the character of the engine. For example, so-called 'sharp' camshafts are used in performance engines.
Camshafts wear out or become defective due to lack of lubrication, and other factors. This can cause damage to the engine block, just as with other bearing parts. If there is damage to the contact surfaces of the camshaft, it is advisable to make a proper diagnosis to determine the cause.
When replacing the camshaft(s), the related parts such as tappets and tows must always be replaced as well. This is because these parts wear on each other.
COMP Cams, Edelbrock and Engine Pro are among the camshaft brands we supply. If you have any questions or would like advice, please contact our product specialists. They will be happy to assist you.
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