okay a while ago i had blown my jdm B18c. I must have over rev'd and bent a few valves in Cyl.3 and blew the piston in that same cylinder. I rebuilt the motor, bought .020 oversized P73 pistons, Omni dual springs, titanium retainers, and high compression valves. so after the motor was put back together and i broke in the motor i did a compression test this afternoon...
my friend was with me and he has the same motor as me but just stock... we did his motor 1st and he got 220 on all four cylinders...
then when it came time for my motor all cylinders came out to 150 except the cylinder that was damaged that one came out to 148
shouldn't i have a Compression number closer to what he has?
the motor isn't burning any oil.. its running stronger than before...
i thought everything was fine until i did the compression test today...
could anybody please give me some help with this????

 

Perform a leak down test to see where you are loosing compression....

 

yeah thats my next test... But about the Compression Number what should my motor be showing? sinces its a jdm gsr with usdm type r pistons??

 

i thought usually the lower the compression the lower the numbers will be at, least there all equal

 

thats what i thought but why would the numbers be so low all around?

 

what cams do you have?

 

i didn't change the cams... still got the stock b18c cams

 

check the valve lash, ive seen it do this before

 

okay when i do the valve lash, should i go by oem gsr spec?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by spooncivic28 &raquo;</TD></TR><TR><TD CLASS="quote">okay when i do the valve lash, should i go by oem gsr spec?</TD></TR></TABLE>
yes

 

maybe you are not getting a good seating surface for your valves since you replaced it with flat valves. Did you reseat the valves get the head inspected? do a leak down test