Valve Float

Valve float refers to a condition that occurs in internal combustion engines when the valves do not fully close or open at the correct time due to excessive engine speed. This can happen when the engine's valvetrain components, such as the valve springs, are unable to keep up with the high RPM (revolutions per minute) of the engine.

When valve float occurs, the valves may not fully close, which can lead to a loss of compression and power. Additionally, the valves may not fully open, resulting in reduced airflow into the combustion chamber. This can cause a decrease in engine performance and potentially lead to engine damage.

Valve float is more commonly experienced in high-performance engines that are revved to high RPMs, such as those found in racing cars or motorcycles. To prevent valve float, engine builders often use stiffer valve springs, upgrade the valvetrain components, or limit the engine's maximum RPM.

It is important to note that valve float can have negative effects on engine performance and longevity. If you suspect valve float in your engine, it is recommended to consult with a qualified mechanic or engine builder to diagnose and address the issue.