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Good Compression test numbers?

40177 Views 5 Replies 4 Participants Last post by  DieselDeaf
I did a compression test on my 01 with 157k miles the other day.
There was only a or 2% split between all the cylinders, very happy with that. Trying to find some poop on good compression numbers.
I got 380 psi low 385 psi high, I think they are good for a truck with this kind of mileage. Can some one confirm this? Also is there a good article or old post about this subject. I can't figure our search engine on this sight to save my life. Thanks
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did you take these as cold compression readings?

for a true indication of compression we take firing readings with our big shipboard diesels. remember that your cylinder sealing is a function of the firing pressure forcing the rings against the oil film on the cylinder walls. firing readings can also indicate stuck rings, weak injectors, burned valve seats.

its very useful and gives a wealth of information.

just for a quick example. we have a 4-53 detroit diesel in the lab here that we do firing compression with. these engines have been beat on and tooled on by kids that have never turned a wrench before. they all run around 600# firing compression.

and a 4-53 detroit is very similar in bore/stroke to a 444e
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