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-   -   US Spec 3.2L Compression Ration (http://forums.pelicanparts.com/porsche-911-technical-forum/806424-us-spec-3-2l-compression-ration.html)

PK 77 911 04-15-2014 10:56 AM
US Spec 3.2L Compression Ration
 
Is 130 to 135 across all 6 cylinders on a 1984' US spec 3.2L an okay compression or is that starting to get on the low side.

Thanks

E Sully 04-15-2014 11:04 AM
It is very low, but should run. Fresh after a rebuild mine was closer to 190.
1986 Porsche 3.2 Compression - YouTube

Reiver 04-15-2014 02:54 PM
Quote:
Originally Posted by PK 77 911 (Post 8016358)
Is 130 to 135 across all 6 cylinders on a 1984' US spec 3.2L an okay compression or is that starting to get on the low side.

Thanks
Hot/cold? A leak down will tell you more than a comp test.

PK 77 911 04-15-2014 03:07 PM
Cold.

JAR0023 04-15-2014 04:08 PM
As a reference point my 150k mile 86 is in the mid 170s. -J

Reiver 04-15-2014 04:08 PM
numbers will be less when cold but imo that's still on the low side...I'd have it done warm/hot and have a leak down done if you are doing a PPI

PK 77 911 04-15-2014 06:14 PM
Yes I think I will do a leak down test on it. Thanks for all the replies.


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