PPI show compression of 210!!!

[axl911]

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]

Well, with a compression ratio of 11.3:1 ... I wouldn't expect anything less than 200 psi!

[Wayne 962]

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]

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?

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anthony

[jabb]

Is the Throttle in the open postion when doing the test ?
It needs to be open.

[axl911]

Redid the test on cyl #4 and compression is 201. So all is ok.

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anthony