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-   -   Compression test values (http://forums.pelicanparts.com/porsche-911-technical-forum/7054-compression-test-values.html)

rsmith40 08-11-2001 02:42 PM
Compression test values
 
What are typical compression test values for an early turbo? Just checked mine (after a total rebuild) and they are all steady at 90psi.

Jerry S 08-12-2001 07:36 AM
Hello, those values sound not too far from reasonable. You have probably a 3 litre turbo in which case you have 6.5:1 compression ratio. When I purchased my car, the compression ratio which was done by a factory dealer showed values of about 110 lbs across the board. A normal 3 litre (SC) engine with 8.5:1 usually has about 140 lbs. Our engines with the lower static compression values will naturally be closer to the 100 lbs mark.

Jerry S

Jerry S 08-12-2001 07:38 AM
By the way my car is a 3.3 litre turbo (81)


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