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Differential Compression Testing ... is 80/80 real?

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Daleandee

Daleandee

Well-Known Member
Joined
Sep 11, 2015
Messages
2,530
Location
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I've heard the claim before and currently there is a Tailwind on Barnstormers where the compression test results are claimed to be 80/80 on all cylinders. I'm not the smartest mechanic in the room but with aircooled aircraft engines I'm not really believing this is possible. All cylinders will leak some amount even if it is very small. I can get 78/80 on a few cylinders (I test with the engine cold) but even at that getting 80/80 on all cylinders seems to me to be nearly impossible. Am I wrong here? It wouldn't be the 1st time ...

BTW, that is a very nice Tailwind he has for sale!
 
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