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Compression numbers...what's good?

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Old 12-11-05, 02:43 PM
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Compression numbers...what's good?

Looking to buy an FD. What numbers should I look for when checking compression?
Old 12-11-05, 03:00 PM
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Search or look in the FAQ....takes like 2 seconds...anything over 100psi is a healthy engine. Look here for more info: http://robrobinette.com/compression.htm
Old 12-12-05, 05:39 AM
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3 even bounces of 100 PSI or above is GOOD. Readings of 125PSI is GREAT!
3 even bounces of less than 100 PSI indicates that motor is getting tired, and 85PSi or below indicates the engine needs a rebuild very shortly

Last edited by BlueTII; 12-12-05 at 05:42 AM.
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