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Air flow thru cylinder-2000 z28

This is a discussion on Air flow thru cylinder-2000 z28 within the Internal Engine forums, part of the LSx Technical Help Section category; In my cam swap process I am at the point of changing valve springs. I intend to pressurize each cylinder ...

  1. #1
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    maroon
    2000 Z28

    Question Air flow thru cylinder-2000 z28

    In my cam swap process I am at the point of changing valve springs. I intend to pressurize each cylinder to keep the valves up when the spring is off. When I pressurize the cylinder by way of the spark plug hole, should the cylinder hold pressure? It does not seem to as I can hear air flowing, not sure from where. Even at very low pressure, like 20 psi, I can hear air flowing. Is this normal?

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    Member RARON455's Avatar
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    white
    98 Ram air T/A Ls1/T-56

    What you are hearing is probably the air bleeding by the rings,, and going into the crankcase, You could pull the dipstick and see if you can hear/feel it coming out. I would expect some leakdown but I am not sure of how much is too much to be honest.

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    Member c5z28's Avatar
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    On your ass flashing
    my highbeams

    Did you make sure the cylinder you are doing it on has the piston at top dead center?

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