My Compression Numbers
 

Dry:
125 120 125 125
Wet:
140 130 135 135

With the vitaras c/r is like 8.4:1, what do you think? This motor (D16y7) has 10K miles on it.

Re: My Compression Numbers
 

Terrible. IMO.

My 7.5:1 cr d15 just pulled 178,172,165,168 cold a few days ago.

Re: My Compression Numbers
 

yea, 140 is low espicially wet.

Re: My Compression Numbers
 

throttle open?..battery charged? how many cranks did you give it? Also im not sure if this is right but i always pull all the plugs not just the one im checking

Re: My Compression Numbers
 

throttle posistion makes no difference.

Re: My Compression Numbers
 

eh, i was just always told to do it open

Re: My Compression Numbers
 

yeah like they said, throttle open, all plugs out, and i usually do 5 cranks. But make sure you do 5 for all cylinders (or 4 for all of them, whatever). Also if you re-do it, tell us the reading of the first crank, that can be importnant as well. Otherwise sounds like it's time for a cylinder leak-down test.

Re: My Compression Numbers
 

IMHO, as long as the #'s are relatively close to each other, its good.
The shop where I work on my car has 4 diff. comp testers. They all read different from each other; like a 5-25psi ------. I freaked out when my 9:1 GSR tested at 150 accross the board, then I used another and got 185 accross the board.
Just stick to one tester, get a good baseline when you know the engine is healthy, and retest/compare against those #'s when you think you've fucked something up down the road.

Re: My Compression Numbers
 

yeah, the best bet is to do a leakdown test along with the compression test. they go hand in hand, and can tell you alot of vital information about the internals of your motor.





sean

Re: My Compression Numbers
 

^^ i agree, if they're all relatively close then it should be all good.