stock engine. hci to go on soon.
maybe his gauge reads high. Either way, good numbers because they are relatively close together in reading. Slap on the HCI
Those are very good numbers, I have seen them that high before, in fact, mine were in the 180s-190s and my car runs like a champ and doesn't burn a drop of oil.
So if you use your starter to crank the motor and you get high numbers, then you turn it over by hand and you get 90's and 80's... that's good because they're close together?
But this test does not know whether it's rings or valvetrain, so in that respect I agree with you... install the heads, cam and intake and do it again, correctly to see where you are at.
Honeslty, I don't know why anyone would turn the engine over by hand to check for compression results. You don't run the engine that slow, it idles approximately how fast the starter can turn it. Plus the starter is consistent, doing it by hand is not.
No compression test ever can say if rings or valvetrain are bad, only that there is a loss of compression. You need to do a leakdown test to find what the problem is. The psi being close between all the cylinders means that either all your cylinders have a problem, or none of them do. With numbers that high, basically it means none of them do.
As far as the psi, I think race engines have well over 200 if they are naturally aspirated. It also does depend on the cam as previously mentioned. My dad owned a comet when he was young that had a 260 with 220psi because of his pop up pistons. Total street car though. My 1985 5.0 had 110psi stock, and the book said that is normal. WHen I upped the compression, I am only getting 130 now, but I know there are no problems with my engine and that is normal psi for it.
The "correct" way to test compression is as strtrcr50 said, turn the starter with the gas pedal all the way down. Make sure you remove the coil wire first!!!!
See... this is one example of someone who "assembles" and engine and another who "builds" an engine.
It is ignorant to say my example is of someone who "assembles" an engine. I have "built" my own and "assembled" my own before. I have checked all the things you listed before myself as well as other things. I just think it is overkill to check compression before the engine is in the car because if you REALLY ARE meticulous about checking things, knowing that the rings, valves, and gaskets, etc are in good shape, means you know your compression will be fine. I don't even check compression on an engine that I built or assembled unless there is a problem with the way it runs or I just want to know how many psi I have.
I still do not see the point of testing it by cranking it by hand. You turn it so slow that the compression is bleeding out through the ring gaps while you are turning it.
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