[s-cars] Compression Test Results

[Mark Turczyn]

Oscar

Dave F is correct-the even wear is good -- as Dave F pointed out the numbers
may be on the lower side of spec.  I think this is reflected in the 15%leak
down number.  I do not like to see more then 10%-- but that is me and does
not mean that you have unacceptable leakage.  Did you hear where it was
coming from.  That is the beauty of a leak down --the ability to get a
handle on where you are losing air.

If you hear it out of the CC breather or oil fill then you may have ring
wear.   With the hard cylinder coating and the ring design these days, I
have found that cylinder leakage is not as common.

More often you hear it out of the exhaust or intake.  Have a friend go back
to the exhaust tip if you run it again to take a listen.

If it is the valve  seating (I assume you did this at TDC) you may simply
have carbon build up and a good tankfull of BG44 may improve your readings.

 






On 2/12/08 11:55 PM, "David Giannandrea" <david.giannandrea at sbcglobal.net>
wrote:

> 
> "The compression test ran 123-128 across cylinders."
> 
> These are good numbers, very small variation between cylinders. Don't know
> about leakdown.
> 
>  
> 
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