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During the power or combustion stage of a piston cycle, both valves are necessarily closed, because the expansion of gases is driving the piston down.

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What is the correct position of the intake valve and the exhaust valve during most of the power stage in a four-cycle engine?

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The position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine?

Closed


What position of the intake and exhaust valves during most of the power stage in a four-cycle gas engine?

Closed


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