bubbling exhaust - JeepForum.com

 
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post #1 of 10 Old 10-04-2009, 06:47 PM Thread Starter
johnroot01
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bubbling exhaust

i just un-jerry rigged my exhaust today and welded it on the right way. even with it jerry rigged it had and still has a bubbling sound when i rev it. any opinions?
i'm trying to fix it, if i can, before i put on a new muffler.


95 YJ: 4" RC, 1" booms, 1" BL, 33x13.50x15 SS TSLs, 15" RCX steelies, minus sway and trac bars


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post #2 of 10 Old 10-04-2009, 06:51 PM
GRN_BEAST95
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is it happening when u rev it up or letiing it come down from the rev?

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post #3 of 10 Old 10-04-2009, 06:52 PM
Louie4
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You sure you fixed all the exhaust leaks? Is it straight piped?

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post #4 of 10 Old 10-04-2009, 08:00 PM Thread Starter
johnroot01
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it comes straight down from the manifold, turns under the tranny, turns to the rear into the cat then the muffler.
i only have about 5-6 inches of pipe after the muffler.
it really only does it with the rpms on the way down.

95 YJ: 4" RC, 1" booms, 1" BL, 33x13.50x15 SS TSLs, 15" RCX steelies, minus sway and trac bars


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post #5 of 10 Old 10-04-2009, 11:16 PM
87WhiteYJ
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Back pressure, a new muffler should fix that. its the sound of exhaust savaging. Will quiet down after new muffler install. Also sometimes the back pressure will be increased with a air leak in the exhaust make sure your patched it up good so when the muffler is installed it goes away
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post #6 of 10 Old 10-05-2009, 04:54 AM
vadslram
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When I was a rodder I used to know I was ready when it bubbled on the let off, It meant that it was running rich enough to fire up in the exhaust. Not the way for daily but it ran better at WOT. Check your timing, it may need to be advanced.
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post #7 of 10 Old 10-05-2009, 08:46 AM
93jeepyj
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It may be the lack of a tailpipe causing that too, what kind of shape is the muffler in that makes you think it might be bad?
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post #8 of 10 Old 10-05-2009, 09:53 AM Thread Starter
johnroot01
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its pretty bad. the cat and the muffler need to be replaced IMHO. they are rusted like hell and feel kinda brittle.

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post #9 of 10 Old 10-05-2009, 11:43 AM
vadslram
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You describe it as Bubbling like it's getting reflecting pops.
Open headers will do that because with no backpressure you get unburnt gas sucked out of the cylinders.This can burn your exhaust valves if it goes on too long. A lot of backpressure is crippling but a little is needed.
If the sound is more like competing pops look for holes in the exhaust system the time between where pressure get to the hole(s) and out the end of the exhaust are different enough to sound kind on like bubbles. Plugged exhaust is easy to figure because you loose all power at higher RPM and it sounds more like a constant whoosh/whistle because there is so much constriction that the gasses come out like out of an air compressor.
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post #10 of 10 Old 10-05-2009, 01:40 PM Thread Starter
johnroot01
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thanks fellas

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