just about to do a compression test on my 1991 4x4 sapphire cosworth
its done 110k and idea what sort of readings i should be after ???????
many thanks jas

 

at least 140 on ALL 4 pots!

 

thanks lets see what we have got then ?? jas

 

what did you get ?

 

got 150 psi on cylinder 1 and 135/140 on the rest ???

 

mate, that is with in spec , when you crank the engine did you have the throttle wide open ???? would explain mismatching readings ( 8 - 10 bar std, no more than 1 bar ( 14.7 psi - 1 bar ) indifference between cylinders
if you are still worried about the indifference then give a little drop of oil in the cyl just before you do the test again, this will tell you if you have a problem with piston ring / bore wear or if its a head / gasket problem ( it may smoke a bit on restart )