I just did a compression test and I got 220 220 195 220

that #3 cylinder is off by 25psi... is that bad? what next? please help!!

scroll down to see new results and wet test


Modified by turbosi03 at 1:25 PM 5/17/2003

 

oooo eh its no that bad, but you prob have a scrape on your cylinder wall, how many miles and what pistons you runnig....also noticed you in the bean town...so close to me being in lowell/dracut area...always looking for fellow import freinds in the area...

 

I have about 2500 mi on the newly build motor (by Comptech). JE pistons, iron sleeves, crower stroker kit (crower rods), drag 3 turbo T3/T40e... thats cool your nearby, my motor was put in the car in Lowel. well have to meet up sometime. dude, I hope my motor is ok, I have to do a wet test. so does everyone think my motor will be ok??

 

The compression is a little high for turbo... isn't it? DId you tell Comptech that it's going to be boosted?

 

well, its a 9.54:1 compression according to Comptech. I don't know if the fact its a 2.0l has anything to do with it. yes, they knew it was a boosted application.

I'm so worried that I have to take the motor apart again, which at that point I give up...

 

well if you give up send all your parts my way...ill gladly accept them for free...sounds like you got one nice setup...displacement does effect compression...more air compressed = higher numbers...when did you start boosting the motor? right after you got it built...maybe one of your ringlands didnt seat correctly...if so youd have to pull it apart...rehone and put in a new ring set...omg you car is awesome...and btw nice gf...you gots the life....nice ride, nice girl, and one tight *** motor.....where did you get you car tuned running the hondata? ive been looking for a place around here for a freind who is soon to be boosting on his prelude...

 

Did you disable your fuel system when you did the comp test, if you don't it will end up raising your #'s a bit? You don't want you injectors to fire during test.

 

my car isn't tuned yet, the hondata is installed but not running yet (waiting to install injectors), I was planning to go to saracuse NY for my tuning (5-6hr ride) but I'm not sure if I should go now because my motor might be screwed.

thats what I want to find out, should I still go get tuned? depends on what the leak down test shows? or no either way?

I did the compression test with the FI fuse removed.

 

recheck you number just for ***** an giggles following the procedure from c-speedracing.com....if not, id search for someone w/ more experience than myself and see what they say, but...good luck and definitaley let me know how the tunning comes out

 

i hope your motor is ok. i would be pissed if i had a setup that nice and it was f up.
i dont know how you guys afford all that $hit.

 

The #3 cylinder in my freshly built engine has always been about 5% lower than the others. I think one or more of the valve seats in the #3 chamber aren't perfect. It's a junkyard head.

Sonny

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbosi03 &raquo;</TD></TR><TR><TD CLASS="quote">I just did a compression test and I got 220 220 195 220

that #3 cylinder is off by 25psi... is that bad? what next? please help!!</TD></TR></TABLE>

check the valve lash clearance on #3 compared to the others

If it is too tight it wont seal

 

ok I did a wet test on #4 and #3 and also re-did all cylinders dry.

dry numbers:

cyl#
4 = 210 wet (1st) = 225 wet (2+3rd) = 230
3 = 185 wet (1st) = 195 wet (2+3rd) = 200
2 = 215
1 = 210

I did a wet test on cyl 4 for comparison

I can see the firt wet test cyl 4 went up 15psi then up 20psi the following times. while cyl 3 went up 10psi the first time then up 15psi after. I don't know what to make of this, can someone help me out?

also I noticed all the numbers changed from the first compression test, the second time around I ran the car up to operating temp before doing the test. caould that be the reason for slight change in dry numbers?

 

wow very peculair, when i did mine i got 210's across the board and it was cold...wonder if id get higher numbers if warm...only reason i could see it being better is if the rings are warm they'll expand a little and seal better and also the oil will be warm and very viscious so maybe it seals better? i dunno hope all is well!