Just did a compression test.....
05-03-2007, 01:53 PM
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Just did a compression test.....
Well after i built this motor i saw compression in the 175psi range. I recently got my car out of storage and just did a test. 140 cross the board. Every cylinder. I used this test on my truck and got 170 cross the board (beat to hell 94 22re) Isnt it wierd to have such low reading? Im on a decent tune that is conservative and all my afrs seem to be proper in boost.
05-03-2007, 01:55 PM
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Re: Just did a compression test..... (ProJectCvic)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ProJectCvic »</TD></TR><TR><TD CLASS="quote">was the motor warm up b4 the test?</TD></TR></TABLE>
Yeah just driving around, 9:1 b16a 81mm (sorry forgot to post info) and tb was open
Yeah just driving around, 9:1 b16a 81mm (sorry forgot to post info) and tb was open
05-03-2007, 02:34 PM
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Re: (Speed Industry)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Speed Industry »</TD></TR><TR><TD CLASS="quote">Drive it around for a while, a few days..
It may just be bad ring seal from sitting so long, maybe even rusted sleeves/rings..</TD></TR></TABLE>
Yeah ive been driving for a week now. I hope the gauges is off by 20-30lbs.
Im happy that the number are consistent, but just a little worried. You guys know how nerve racking F/I **** is.
It may just be bad ring seal from sitting so long, maybe even rusted sleeves/rings..</TD></TR></TABLE>
Yeah ive been driving for a week now. I hope the gauges is off by 20-30lbs.
Im happy that the number are consistent, but just a little worried. You guys know how nerve racking F/I **** is.
05-03-2007, 04:02 PM
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Re: (Boosted Chemist)
Actually, I got the same exact numbers... 140 across. fully built b16 9:1 pistons, .019" top ring, .021~.024" second ring gap.
I've always had this reading even when the motor was freshly built. It ran strong for 13k miles and sat for over a year... Did compression check recently and came up with same readings, different gauge (same type).
So we're either both ok or screwed... I say if it runs strong, and numbers are consistant then don't worry
Oh thats right it's a boosted Honda... Worry about something else
I've always had this reading even when the motor was freshly built. It ran strong for 13k miles and sat for over a year... Did compression check recently and came up with same readings, different gauge (same type).
So we're either both ok or screwed... I say if it runs strong, and numbers are consistant then don't worry
Oh thats right it's a boosted Honda... Worry about something else
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05-03-2007, 04:30 PM
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Re: Just did a compression test..... (Boosted Chemist)
9:1 motors have relatively low compression. 140 is probably fine. If you're worried about it, then do a leakdown test on it.
05-03-2007, 05:04 PM
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Re: Just did a compression test..... (rmcdaniels)
Yeah it does run very strong, a little smoke in boost, but i think my turbo seals are toast. (oil in charge pipe+dripping out of chra) I think im going to do a leakdown, and if its shitty rebuild this winter, but for now if its going down...its going down hard
05-03-2007, 05:57 PM
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Re: Just did a compression test..... (Boosted Chemist)
the first motor i built, i never did a leakdown test, just for the factt hat i didnt want to rebuild if it was beat.
It ran strong, so i put my worries else where
It ran strong, so i put my worries else where
05-03-2007, 07:08 PM
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Re: Just did a compression test..... (93supercoupe)
when i got my ls motor first running after sitting in a junkyard from march- november it had like 150ish psi compression. after around a week or 2 of driving it came up a good 20-30 psi. i wouldnt worry and def give it more time
05-04-2007, 05:38 AM
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Re: Just did a compression test..... (blackeg)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by blackeg »</TD></TR><TR><TD CLASS="quote">when i got my ls motor first running after sitting in a junkyard from march- november it had like 150ish psi compression. after around a week or 2 of driving it came up a good 20-30 psi. i wouldnt worry and def give it more time</TD></TR></TABLE>
Cool thanks dude
Cool thanks dude
05-04-2007, 06:04 AM
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Re: Just did a compression test..... (Boosted Chemist)
If you are not getting much blow-by I would not worry about it. if you do see a lot of crap coming out of your breather... your rings would be suspect.
Drop a spoon full of oil in there and see what you get.
Drop a spoon full of oil in there and see what you get.
05-04-2007, 06:10 AM
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Re: Just did a compression test..... (Alfa Turbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alfa Turbo »</TD></TR><TR><TD CLASS="quote">If you are not getting much blow-by I would not worry about it. if you do see a lot of crap coming out of your breather... your rings would be suspect.
Drop a spoon full of oil in there and see what you get.</TD></TR></TABLE>
After beating on it at idle i get some, not a ton but there is def a little smoke coming out of my endyn catch can.
Drop a spoon full of oil in there and see what you get.</TD></TR></TABLE>
After beating on it at idle i get some, not a ton but there is def a little smoke coming out of my endyn catch can.
05-04-2007, 06:33 AM
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Re: Just did a compression test..... (Alfa Turbo)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Alfa Turbo »</TD></TR><TR><TD CLASS="quote">It would show up the most under boost.</TD></TR></TABLE>
Yeah some smoke under boost, but i think its to blame on the turbo seals.
Yeah some smoke under boost, but i think its to blame on the turbo seals.
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