compression low in #3 but no smoke what so ever?????
10-09-2007, 07:45 AM
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compression low in #3 but no smoke what so ever?????
well compression was good across the board except #3 which was 60 THEN POURED CAP FULL OF OIL IN AND THE COMPRESSION WENT TO 120. im tearing the motor down next week to install pistons and wanted to make sure the rings were bad. the car does not smoke an ounce, so i just want to be sure what the problem is before next weekend
10-09-2007, 09:04 AM
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Re: compression low in #3 but no smoke what so ever????? (turbo-crx)
It went from 60- 120 on on a b16?? When i did mine the lowest cylinder was 125 or so. now im at 230,230,225,220. your #'s hardly matter since you said your going with new pistons so hone it slap it back together and check your #'s again.
10-09-2007, 09:55 AM
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Re: compression low in #3 but no smoke what so ever????? (Si GUY99)
YEA WELL THERES NO POINT OF TEARING DOWN THE MOTOR IF THE RINGS ARENT BAD. COULD IT BE SOMETHING ELSE? TI WAS 180 ACROSS THE BOARD EXCEPT #3 WHICH WAS 60 BEFORE THE CAP FULL OF OIL WAS PUT IN THEN SHOT TO 120
10-09-2007, 10:10 AM
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Re: compression low in #3 but no smoke what so ever????? (turbo-crx)
you could have a bent valve in that cylinder. I've seen even good cylinders shoot compression up some when putting oil in. If theres no smoke or blowby that would be my bet.
10-09-2007, 10:21 AM
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Re: compression low in #3 but no smoke what so ever????? (SOHC_MShue)
WOULDNT YOU HERE SOME KIND OF NOISE IN THE HEAD OR SOMETHING?
10-09-2007, 02:45 PM
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Re: compression low in #3 but no smoke what so ever????? (turbo-crx)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by turbo-crx »</TD></TR><TR><TD CLASS="quote">WOULDNT YOU HERE SOME KIND OF NOISE IN THE HEAD OR SOMETHING?</TD></TR></TABLE>
no not always
no not always
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10-09-2007, 02:48 PM
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Re: compression low in #3 but no smoke what so ever????? (SOHC_MShue)
no i just always forget to turn off captions when i change screens at work 
10-09-2007, 03:49 PM
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Re: compression low in #3 but no smoke what so ever????? (Tippyman)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tippyman »</TD></TR><TR><TD CLASS="quote">Do a leakdown test and it will tell you exactly where it is...</TD></TR></TABLE>
Leakdown test will tell ya
Leakdown test will tell ya
10-09-2007, 04:02 PM
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Re: compression low in #3 but no smoke what so ever????? (SOHC_MShue)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue »</TD></TR><TR><TD CLASS="quote">you could have a bent valve in that cylinder. I've seen even good cylinders shoot compression up some when putting oil in. If theres no smoke or blowby that would be my bet.</TD></TR></TABLE>
It could also be a burnt valve, in which case it wouldn't make much noise. But i third the notion for doing a leak down test. I don't even waste my time with compression tests anymore. Leak down tests will actually tell you something.
It could also be a burnt valve, in which case it wouldn't make much noise. But i third the notion for doing a leak down test. I don't even waste my time with compression tests anymore. Leak down tests will actually tell you something.
10-09-2007, 04:32 PM
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Re: compression low in #3 but no smoke what so ever????? (90sedan)
thanx guys. who can do a leakdown test or can i buy the tools to do it?
10-09-2007, 05:09 PM
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Re: compression low in #3 but no smoke what so ever????? (turbo-crx)
I know the snap-on guy has one.
I once asked this question at a parts store, and they looked at me with a blank stare. So parts stores might have them that you can rent out, if they know what you are talking about.
I once asked this question at a parts store, and they looked at me with a blank stare. So parts stores might have them that you can rent out, if they know what you are talking about.
10-09-2007, 05:22 PM
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Re: compression low in #3 but no smoke what so ever????? (93turbo16)
you broke your ringland... i promise you.. its the ringland.. it sounds like a subaru when it revs up. lumpy idle. etc.
10-09-2007, 05:25 PM
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Re: compression low in #3 but no smoke what so ever????? (90sedan)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90sedan »</TD></TR><TR><TD CLASS="quote">
I don't even waste my time with compression tests anymore. Leak down tests will actually tell you something. </TD></TR></TABLE>
got that right
I don't even waste my time with compression tests anymore. Leak down tests will actually tell you something. </TD></TR></TABLE>
got that right
10-09-2007, 10:52 PM
#16
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Re: compression low in #3 but no smoke what so ever????? (90sedan)
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 90sedan »</TD></TR><TR><TD CLASS="quote">It could also be a burnt valve, in which case it wouldn't make much noise. But i third the notion for doing a leak down test. I don't even waste my time with compression tests anymore. Leak down tests will actually tell you something. </TD></TR></TABLE>
yea true compression tests will show up good half the time when something is terribly wrong. Although in my experience with a bent valve it will still read some pretty shitty compression on a compression test.
yea true compression tests will show up good half the time when something is terribly wrong. Although in my experience with a bent valve it will still read some pretty shitty compression on a compression test.
10-10-2007, 08:10 AM
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compression ring though dealin' and oil control ring still dealing = no smoke and shitty compression. when you put the oil in it sealed and bumped it up to 120. when you do a leak down you are gonna find the prob is with the rings. if you have a burn valve or something of that nature it would not have held 120psi. if the compression numbers had stayed around 60psi with the oil in there then i would look at the head as your culprit. but i am willing to bet money its in the block.
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