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My car has about 60,000 miles on it and before i spend another $1000 on my nitrous setup i want to do a compression test to see how healthy my engine is. I was just wondering if anyone had an idea on about how much the compression should be around when the motor was new and about how much compression a 3.8 with a hard 60,000 miles should have on it to still be considered healthy.
I tried a search did not find much, thanks.
With only 60,000 miles, the compression should be identical or slightly higher (due to carbon buildup) than when it was new.
I will try to lookup the value for our engines in a minute. Stock CR is of course 9.4:1, and total displacement per cyl is 631.88cc when brand new.
A rule of thumb is that there should be no more than 10% to 15% variance from the cylinder with the highest compression reading to the cylinder with the lowest reading.
Since our CR is 9.4:1, and atmospheric is 14.7psi, you should register readings ~138psi per cyl.
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