on a gsr (stroke and length are the same as stock), if je pistons are 9:1 ratio and the bore is 81.5mm with a stock chamber on the gsr head, does 150psi all across sound right to you?

I did some searches on google too but didn't really find anything. thanks.

 

I think 180 would sound better, but in general if all your cylinders are within 5% of each other or so then it's safe to say your good.

How many miles are on the motor? You can also do a leakdown if you want another perspective on cylinder seal.

Also, since your compression testing, is there a problem that is leading you to want to do this, or are you just compression testing out of curiosity?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redlinetuning &raquo;</TD></TR><TR><TD CLASS="quote">on a gsr (stroke and length are the same as stock), if je pistons are 9:1 ratio and the bore is 81.5mm with a stock chamber on the gsr head, does 150psi all across sound right to you?

I did some searches on google too but didn't really find anything. thanks.</TD></TR></TABLE>


Are you doing the compression test after the motor is up to operating temp? Also while cranking have accelerator to the floor as well?

#s seem low BUT the important part is it is consistent across the board.

 

actually a buddy of mine did the compression test. it's a turbocharged car he's interested in getting. he asked me and i wasn't sure why it was a bit low.

thanks for the answers. he did say he did the test before the engine was at operating temp ..

 

have you performed a valve adjustment on this motor

 

how many cranks? do it over

 

Sound about right since it was still cold when he did the compression.

 

throttle open, 4-5 blips on the gauge.

if you are scared, put a drop of oil in the cylinder before and see if and how much it goes up. if it is significant, then the rings are done.