Cyber ITR

200 across , cranked it like 5-6 times

JDM B18C

compression seems to be too low for a B18C right ?

hiks

RGAZ

Nope. Right on the money. You will probably not see anything higher than 215 ever, so 200 across is good. Start seeing 150 and you got problems.

Randy

GruvyTune

if you have lower compression pistons, does it affect compression testing at all?

M.A.R.C.

hey i have a question bout compression tests... i did mine... and i cranked it as many times as the haynes manual said... and i kept coming up with like 230ish across the board i think it was... this is in a stock d16y8 w/ 40000 miles and it's been thru 3 months of nitrous use. Am I doing something wrong?

IHaveTurbos

Did you disable the fuel system before you did the compression test? This could cause you to get false reading's, cause the injectors are still dumping fuel into the cylinder.

M.A.R.C.

yah did that

IHaveTurbos

I don't know what would cause you to get reading's like that then!!!!!

GSRwBOOST

low compression will give you lower numbes..

i had 10-1 stock and got 200-220

and

now i have 8.5-1 and get 180psi in all cylinders


low numbers or numbers that vary indicate worn rings....

Cyber ITR

so if the injectors still pumping fuel into the cylinders , will it get higher reading or lower reading ??

thanks

BHSCGSR

190 across the board for me.
Somewhat low for a GSR but......Stock bottom end with 65k, 3 15lb bottles of NOS, and the last 20k with a S/C at 8lbs.....

dirtySOHC's

holy ****.....230 on a y8. i dont know wat to tell you but i get 180 on my motor. you must have some serious carbon build up but still those mumbers are really high.

niedejb

Say you find one lower than the others. I know piston rings is first culprit, but could there be a valve issue instead?

dirtySOHC's

leak down test

Sonny

You guys are neglecting to mention the variance between gauges.

My B16A2 showed anywhere from 200 to 225 psi on every cylinder depending on which compression gauge I used (Sears, Matco, Snap On)

Sonny

niedejb

Still doesnt tell you where the leak is coming from.

Cyber ITR

GSRwBOOST : is that mean if i have 200 across but very consistent my rings are OK ??

thanks