okay...i've built my motor and broken it in already....i have 1,300 miles on it
i've did a compression test on it at 300 miles after it was tuned w/ out boost..

150psi all across

at 500 miles 150psi all across

now at 1300 miles it's still 150psi across all 4 cylinders...why is it so low ?

would my piston to wall clearance affect it in any way....

my block was sleeved by GE.....i told them to .35 piston to wall clearance but they had it at .32

what could cause these low numbers ?

i tried it without fuel and with fuel......i dont have a leak down tester...

my block was deck
head has been resurface
cometic HG .30
ARP headstuds
9-1 mahle pistons
eagle rods

and also my car idles when its cold and sometimes when hot...idle stays at 1500rpm all the time...tb is shut all the way....stock tps...stock map


what could be wrong....im installing my turbo 2 weeks from now and i need to know if its okay to do so.....

ive changed my turbo setup becuase my GF gave me $800....


full race t3/t67
full race ramhorn
3 inch dp
44 mm tial wg
hks bov
2.5 aluminum chargepipe
greddy 24v fmic
precision 880cc
avcr
p28 chrome for now......

daily driver.....

need help....



Modified by black_ek at 6:08 AM 1/29/2008

 

I don't see what compression pistons or what thickness hg you used. If your compression is lowered to the 8.x:1 range, I could understand a 150psi reading.

edit: Being your numbers are consistent, have you tried another gauge? I once had a gauge that was notoriously low compared to others.

 

i havent tried another gauge..but its kind of wierd because i tested 2 other 94 integra ls and the
compression was 120 psi all across on both motors...

i should go buy a new gauge or borrow one....

i updated the HG and pistons...

stock 3 layer cometic HG

9-1 cr...but remember i shaved my block before i build this...cause i had it all motor back then...

then it was decked again by golden eagle

so i dont know where the CR is at...

 

i wouldn't be worried with the test results. The numbers are even and thats whats most important.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">i wouldn't be worried with the test results. The numbers are even and thats whats most important. </TD></TR></TABLE>


150 is not too bad for 9:1 compression, it could just be the gauge is off a bit or something. As stated all that really matters is that the #'s do not vary drastically.