Question:
a. the intake valve is closed and the exhaust valve is open
b. the intake valve is open and the exhaust valve is closed
c. both the intakeand the exhaust valves are closed
d. both the intake and exhaust valves are closed
Answers:
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If MOS is reffering to the moment of spark then both valves would be in the closed position in a four stroke motor.HELP! how many cars are there aloud in one driveway?
Both closed - otherwise, there would be no significant compression, and the energy (the pressure increase) from the burning fuel would be pushed straight out past the open valve and not exerted onto the piston crown.More Questions & Answers ...
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