Similar Conditions
Valve loft is intentionally using a controlled valve float to increase lift and duration of the valve open cycle. In some motorsports there are rules that limit camshaft lift; therefore, provoking this type of exploitation. Properly optimizing the system avoids undue stresses to the camshaft lobes and tappets.
Valve bounce is a related condition where the valve does not stay seated, due to the combined effects of the valve's inertia and resonance of metallic valve springs that reduce the closing force, and allow the valve to re-open partially.
Read more about this topic: Valve Float
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