up-rated valve springs

When changing the cam and its lift characteristics up-rated valve springs should be fitted, thereby matching the valve springs to the up-rated cam. If the original springs are used then the greater cam lift could cause the spring to become coil bound. With a more aggressive cam and high reving of the engine there comes a point were the inertia of the valve and its components are to great for the valve spring to counter act. This in effect changes the timing of the engine, and is known as valve float. Up-rated springs counteract this greater inertia. However if the valve springs are too stiff this will generate increased frictional losses and as a result more bhp will be lost.

For more information on up-rated valve springs talk to Amac Engineering