Compression test done
 

I had some headstuds put in yesterday for my upcoming turbo setup so I figure I should do a comp test. On a warm motor at wot here are the results:

193 181 188 190

Does it matter if I didn't take out all of the spark plugs? I took one out and tested that cylinder then put it back in and so on.

This is on a stock y7 block with a stock y8 head.

Re: Compression test done (EK k kay)
 

not bad, but i think they are suppose to be within 15% of eachother. I that same motor last fall, after boosting 15 psi, i was like 220 in each cylinder, so i don't know.

Re: Compression test done (coneheadsracing)
 

U have to take out all the plugs and unplug the distributor and test it on a cold motor.

Re: Compression test done (jdmhonda)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by jdmhonda &raquo;</TD></TR><TR><TD CLASS="quote">U have to take out all the plugs and unplug the distributor and test it on a cold motor.</TD></TR></TABLE>

Cold? All the threads I have read have said to test it while it's warm.

Re: Compression test done (EK k kay)
 

warm engine, and you don't have to take out all the plugs at once, your only testing the one cylinder.

Re: Compression test done (coneheadsracing)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by coneheadsracing &raquo;</TD></TR><TR><TD CLASS="quote">not bad, but i think they are suppose to be within 15% of eachother.</TD></TR></TABLE>

Maybe I'm a little confused here not knowing if that 15% is from the lower, the higher or the average of the numbers, but.....

(.15)*181 = 27.15, 181 +/-27.15
or
(.15)*193 = 28.95, 193 +/-28.95
or
(.15)*188 (ave) = 28.2, 188 +/-28.2

So it seems whether you take the higher, the lower number or even average them he is well within 15%. Right? Just curious. https://honda-tech.com/forums/images...s/emsmilep.gif

Re: Compression test done (EK k kay)
 

i have a y7 that i just rebuilt here are my numbers as of last night

195
195
190
195

as long as they are close and above spec they are fine man..

Re: Compression test done (KeyserSoze)
 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KeyserSoze &raquo;</TD></TR><TR><TD CLASS="quote">Maybe I'm a little confused here not knowing if that 15% is from the lower, the higher or the average of the numbers, but.....

(.15)*181 = 27.15, 181 +/-27.15
or
(.15)*193 = 28.95, 193 +/-28.95
or
(.15)*188 (ave) = 28.2, 188 +/-28.2

So it seems whether you take the higher, the lower number or even average them he is well within 15%. Right? Just curious. https://honda-tech.com/forums/images...s/emsmilep.gif </TD></TR></TABLE>

15% from each other. Basically the numbers should not be more then like 20-25 psi from each other.

whats the difference between WOT and not? i mean how much of a difference will we see?