Compression psi/ratio
Postmaster
Joined: Jun 2005
Posts: 2,656
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it's hard to say...the cam will effect the pressure...what you want is a good even number on all 8... if you get one thats way out say 50psi low then you have a problem....just keep track and do them all,
Make sure you open the throttle all the way and remove the power from the coil....make sure you spin it enough, I like to hit the guage 5 times.
Make sure you open the throttle all the way and remove the power from the coil....make sure you spin it enough, I like to hit the guage 5 times.
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Senior User
Joined: Jun 2006
Posts: 135
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Gotcha Hemi. Do you think that Cam Research would be able to tell me the pressure since they built my cam? I didn't realize ya had to hold the throttle wide open. Good info as always.
Thanks Hemi!
Thanks Hemi!
Senior User
Joined: Jun 2007
Posts: 103
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You should also remove ALL the spark plugs when doing a compression test. As long as the compression is relatively even, Ford says something like within 20# of each other, then the compression is good. I would think that a good comp reading would be somewhere around 120 PSI or more.
Hope that helps some,
Dan Harriman 84 F150 lwb
Orange, Texas
Hope that helps some,
Dan Harriman 84 F150 lwb
Orange, Texas
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