Little help interpreting compression test results, please

jtexas

Fleet Admiral
Joined
Oct 13, 2003
Messages
8,646
1979 'rude 70<br /><br />Summer 2003, just before giving me his motor my dad had it in the shop, carb rebuild, couple other things including compression test, results <br />125<br />125<br />120<br /><br />Test results yesterday showed<br />183<br />183<br />180<br /><br />Maybe I did something wrong...I had the motor warmed up, plugs out, kill switch thrown. My gauge doesn't go to zero, the needle never points below 60 - I just figured that must be atmospheric pressure or something (what do I know).<br /><br />Any thoughts on how to interpret this discrepancy?<br /><br />thanks,
 

Joe Reeves

Supreme Mariner
Joined
Feb 24, 2002
Messages
13,262
Re: Little help interpreting compression test results, please

Subtract 60 psi, then purchase a new gauge.
 

JB

Honorary Moderator Emeritus
Joined
Mar 25, 2001
Messages
45,907
Re: Little help interpreting compression test results, please

Your compression is fine, JT. You probably didn't do anything wrong. The important thing is the range of measurements you get. It would be a good idea to replace the guage, though.
 
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