Leak Down & Compression test from hell- Updated
05-21-2010, 02:35 AM
#17
Drifting
I'd trust your butt dyno here. The fact that the test results are so atypical, the test procedures highly suspect, AND you have a solid car to compare it to (back to back if you wish, even), makes me think you can purchase with confidence without a retest, so long as your test drive finds no issues.
05-21-2010, 09:16 AM
#18
Noodle Jr.
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05-21-2010, 11:24 AM
#21
Race Director
05-21-2010, 12:46 PM
#22
05-21-2010, 02:09 PM
#23
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https://rennlist.com/forums/993-turb...-business.html
05-21-2010, 02:11 PM
#24
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05-22-2010, 11:25 AM
#26
Racer
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These numbers do not make sense. If they did a leakdown test at let's say...140 psi, some of the percentages are close if calculating after leakdown, but others are not. I've not seen numbers posted like this. Leakdown tests can be done with different pressures, we use 80 psi on aircraft engines and list the pressures held (76 psi, 78 psi, etc) The method used and the skill of the mechanic can make these numbers fluctuate up or down, usually down. I would only have someone I trusted do it if I didn't do it myself.
Whats with the @10 psi # on the original post. If they cannot explain themselves, I would argue with them about payment for some meaningless numbers. You may be in a position to negotiate a lower price and/or write it up to a bad experience.
All the cylinders are all within a few psi, so whatever they stand for, the engine probably runs smooth....
but you probably knew that when you drove it in...
Whats with the @10 psi # on the original post. If they cannot explain themselves, I would argue with them about payment for some meaningless numbers. You may be in a position to negotiate a lower price and/or write it up to a bad experience.
All the cylinders are all within a few psi, so whatever they stand for, the engine probably runs smooth....
but you probably knew that when you drove it in...
05-22-2010, 11:38 AM
#27
Rennlist Member
I did the same thing you did and wondered why they would use 137.5psi (I used the first number: 1/0.88 x 121)...and then some of their psi numbers are different for the same percentage. Whats with that?