compression
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compression
I just did a compression test on my 1989 2.9 v6 with 257,000 miles on it. I got readings from 158 to 150. What I don't know is what a new motor would read. I understand their shouldn't be more than a 30% difference between cylinders and I believe I am good in that aspect. I guess what I need to know is what have I learned from the test? How should I interpret the readings? 
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Joined: Sep 2003
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From: SoCal
I think your readings indicate that all the cylinders are in pretty much the same condition; none of them is much more worn than any of the others. To get more detailed information, you would need to do a leak-down test. This will tell how worn the rings and valves are. But if you're not burning oil excessively, I wouldn't worry about it.
To properly lubricate the cylinder walls, some oil will be consumed during normal operations. Ford says that up to 1 quart burned every 1500 miles is "normal". That seems kind of high to me, but it's what my 87 Mustang v8 has been doing since new.
To properly lubricate the cylinder walls, some oil will be consumed during normal operations. Ford says that up to 1 quart burned every 1500 miles is "normal". That seems kind of high to me, but it's what my 87 Mustang v8 has been doing since new.
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