I just got done building my b16a2, I used wiseco 9.1:1 compression pistons and a cometic hp gasket. It only has about 200 miles on it since the build and I decided to run a compression test on it to see how it was doing. I got 125 across the board, this seems low but they are all dead even, is there anything that i should be worried about ? The car runs great and seems very powerful although I have yet to run it hard, until its broken in of course.

 

Are you doing the test while WOT? Numbers are drastically reduced if you don't. It IS a good thing that the numbers are the same across the board though.

 

no the tests were not done at wot i was unaware that was necessary

 

Put the pedal to the floor and do the test again. 125 is definately low for 9.1:1

 

alright will do thanks for the info

 

a compression test should be done with the engine warm and with WOT

 

yeah it was warm but not at wot thanks for the input guys

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dx2dR95 &raquo;</TD></TR><TR><TD CLASS="quote">yeah it was warm but not at wot thanks for the input guys </TD></TR></TABLE>

Based on your numbers, and that they weren't at WOT, it seems that your motor is in good shape. Most important is the variance between the numbers. You got 125 across the board, which is

 

well i had a chance to do the test again and the numbers are exactly the same, 125 across the board, i tested wot and closed throttle, the only difference was that it built the compression faster with the throttle open

 

any thoughts