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all strokes are the same intake, compression, power, exhaust but it all happens in 2 revolutions of the crank instead of four revolutions like 4 stroke. Also 2 stroke has no valves and four stroke has intake and exhaust valves. hope this helps
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Closed.
They are closed during the power stage.
Both the intake and the exhaust valve are closed.
intake, compression, power, and exhaust.
A four stroke engine requires the piston to travel up and down a total of 4 times to complete one full combustion process. The 4 strokes are: intake, compression, power (ignition), exhaust. And the intake and exhaust valves are timed accordingly. A two stroke engine fires ever other stroke and uses ports for intake and exhaust (no valve train)
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Intake, Combustion, Power, Exhaust
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.
Intake, Combustion, Power, Exhaust