Thread: compression test ?

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when you do a compression test , do you pull one plug at a time and the put it back in or can you leave the plug out and go to the next cylinder ,cause i left each plug out and went to the next cyl. and of course the motor turns over faster so i got a higher reading than the first time example pulled number one all other plugs still in 135lbs went through all other cylinders left all 8 plugs out and tested number 1 again 160lbs should i do one cylinder at a time one plug at a time?

well, professionally you take all plugs out then test and that's how we do them at school but at my house, I take 1 out individually and put it back after each cyl test.

now there all out let me go out here and test all cyl. again

i have
1-155
3-160
5-160
7-160
2-160
4-155
6-160
8-155
ill try tomarrow one by one

I realy don't see anything wrong with those readings

sounds good to me ,i put this motor together last spring and even the pugs look brand new

those readings are perfect. the SBC book my dad has says within 6 PSI is perfect for SBC's, in general within 10% is ok.

Pull all the plugs and wire the throttle blades wide open.

ill do that tomarrow