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Valve float
Valve float is an adverse condition which can occur at high engine speeds when the poppet valves in an internal combustion engine valvetrain do not properly follow the closure phase of the cam lobe profile. This reduces engine efficiency and performance and potentially increases engine emissions. There is also a significant risk of severe engine damage due to valve spring damage and/or pistons contacting the valves.〔http://books.google.com/books?id=GUC52-afG5EC&pg=PA111&lpg=PA111&dq=can+valve+float+cause+engine+damage&source=bl&ots=H-ZNGn9L_q&sig=eGgN3AYfXCMN8qYcJfIXIn0WHSc&hl=en&sa=X&ei=gt6MU__3CMeSqgbztYKIAQ&ved=0CHUQ6AEwCQ#v=onepage&q=can%20valve%20float%20cause%20engine%20damage&f=false〕
== 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.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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