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If the valve timing is correct and there are no damaged engine parts (or weak/faulty valve springs) that should not happen, yet however if the engine is "over-revved" the valves could "float" which is not normal operation. (If the engine is an interference engine there may possibly be engine damage.)

That is normal and it is called valve overlap.

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14y ago

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In four-stroke engine the time period when both valves slightly open?

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Explain the advantages of four-stroke engine over two-stroke engine


What is meant by the term valve overlap?

There is a short time between the exhaust and intake stroke where all the valves are slightly open at the same time. This period of time is called valve overlap. This is because the intake valves are just starting to open as the exhaust valves are just finishing closing. This is done so flow through the engine can be maintained at engine operating speeds.


When an engine has a cylinder bore that is larger than its stroke what is this called?

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