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
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
