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-   -   PPI show compression of 210!!! (http://forums.pelicanparts.com/porsche-911-technical-forum/82640-ppi-show-compression-210-a.html)

axl911 10-01-2002 08:49 PM
PPI show compression of 210!!!
 
Just did a PPI on a C2. The results are
#1: 210
#2: 212
#3: 214
#4: 186!!!
#5: 201
#6: 206

I thought they are supposed to be around 180. Why the high values? What do you think of #4 being 186?

thanks,
anthony

Early_S_Man 10-01-2002 08:56 PM
Well, with a compression ratio of 11.3:1 ... I wouldn't expect anything less than 200 psi!

Wayne 962 10-02-2002 01:32 AM
Number 4 = bad sign.

This is not a good result for a compression test. Numbers should be within about 5% of each other...

This one is more than 10% off...

-Wayne

axl911 10-02-2002 06:04 AM
Having the car retested today on cyl #4. At 11.3 to 1, shouldn't the compression of the cylinder be 11.3*14.7=166?

---
anthony

jabb 10-02-2002 09:31 AM
Is the Throttle in the open postion when doing the test ?
It needs to be open.

axl911 10-03-2002 06:08 AM
Redid the test on cyl #4 and compression is 201. So all is ok.

---
anthony


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