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The valve spring serves to return the valve to its original position (closing the combustion chamber) after it opens due to pressure from the camshaft. The performance mechanism of the valve springs is an integral part of the valve and camshaft. Performance per valve is seen from its ability to maintain its hardness even at high rotation and high engine temperature. This functions to prevent floating or floating valves when the camshaft is at high rotation which can result in piston compression leaks. Or even the valve / valve closes too late so that it can resulting in a collision between the valve leaf and the piston head.