Ive got a JDM b18c gsr and decided to do a compression test (completly stock internally). I did it at WOT with a warm motor. It came out as 192 - 192 - 189 - 190 with a tester from autozone. Ah... are these numbers bad?? Someone told me that different gauges would give different numbers but... Im not sure if I believe that or not. What do you guys think? thanks

 

different compression do give different numbers....i have 230 across with my gsr at 200k miles.....those numbers do seem low but atleast its pretty even...

 

as long as they are all pretty much even you should be good...although they are kinda low..how is the car runnin?

 

those #'s are fine i have seen new itr motors with compression about that high

 

yea those numbers are good.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Stripped Honda &raquo;</TD></TR><TR><TD CLASS="quote"> those #'s are fine i have seen new itr motors with compression about that high</TD></TR></TABLE>

serious? my jdm itr had about 255-260 across...and ive seen other itr on that range too...never seen itr that low before....

 

sweet! maybe my motor isnt going to go! haha, i guess ill try a valve adjustment and do another compression test.

 

yup those should be fine....what kinda compression tester do you have? sometimes the cheap ones won't give you accurate readings.

 

I think your numbers are fine. However, did you add a small amount of oil to check for ring blow-by?

 

well unless there was variance would there be need to check for that??? didnt think a wet compression test was in order unless there was discrepency with the first dry test..

 

Compression test = Good at telling you that you have compression.

Leakdown test = Good at telling you if you have any problems (Worn rings, bad valve guide seals, bad headgasket, bent/burnt valves).

Compression tests serve a purpose, but will not always tell you if your engine has a problem.

 

thats not true...if there is variance youd have a problem...havent seen a car with horrible rings give solid compression across all cylinders...compression is related to your rings sealing ability...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lVlemphizStylez &raquo;</TD></TR><TR><TD CLASS="quote">well unless there was variance would there be need to check for that??? didnt think a wet compression test was in order unless there was discrepency with the first dry test..</TD></TR></TABLE>

Although unlikely, they could all be leaking equally. I still think he is fine.

 

lmao id have to get that on vid if someone had perfect leaking across all 4 cylinders...thats gotta be rare

 

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by lVlemphizStylez &raquo;</TD></TR><TR><TD CLASS="quote">thats not true...if there is variance youd have a problem...havent seen a car with horrible rings give solid compression across all cylinders...compression is related to your rings sealing ability...</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by KooK &raquo;</TD></TR><TR><TD CLASS="quote">
Compression tests serve a purpose, but will not always tell you if your engine has a problem.</TD></TR></TABLE>

I didn't say compression tests were useless, but there have been engines that produce good compression test results while still having bad rings. The real difference is that the compression tester will raise slower on the cylinders with the bad rings. You're right in saying that normally compression results will vary, but you're better off using a leakdown tester to tell you more exact numbers and whether your engine is having problems or not.

 

dont u compare the dry and the wet to get the answer you are lookin for?

 

you do the wet compression test if there is suspicion of bad sealing with your rings

 

yea i know..so you would have to compare it to the dry test right? do the dry test first...oil it up...then do the test again...and compare the #'s? just clearing my head up

 

if you do it dry and there is variance ...if you go back and do it wet and the compression goes up in a cylinder then the rings are bad in that cylinder

 

cool..thats wat i needed to know...ty

 

The Helms manual states that the nominal or ideal cylinder pressure is 270 with a minimum acceptable value of 135 and a maximum variation among pressure readings across all four cylinders of 28.