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Re: exhaust "bangs"
[Re: paddel]
#2061317
04/25/16 12:10 PM
04/25/16 12:10 PM
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Joined: Dec 2014
Posts: 5,924 ohio
ruderunner
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master
Joined: Dec 2014
Posts: 5,924
ohio
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Sounds like an exhaust leak. When it's rich exhaust (as in coasting down from revving) the extra air allows the fumes to reignite in the exhaust. Usually in a muffler as they are the likely places for the excess fuel to collect.
Check for leaks at all connections. Could be a loose clamp or bad header seal or..
Angry white pureblood male
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Re: exhaust "bangs"
[Re: paddel]
#2093569
06/17/16 04:31 PM
06/17/16 04:31 PM
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Joined: Apr 2015
Posts: 107 germany
paddel
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Should I also lean out the idle mixture a little bit? As I richened a bit much after rebuilding the carb for more performance. Keep in mind that I also recurved the distributor quite a bit because of my low compression.
I'll also change my old very dirty air filter for a new one. Maybe that also leans out the mixture just a tiny little bit. I have one of those aftermarket cleaners as I can not find an original one here in germany.
Last edited by paddel; 06/17/16 04:33 PM.
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Re: exhaust "bangs"
[Re: paddel]
#2093649
06/17/16 07:15 PM
06/17/16 07:15 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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Posts: 14,889
up yours
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Only time I ever had that happen I had an intermittent plug wire bad issue, it's not fire the plug, and the next cylinder on that side would fire the mixture on it's exhaust stroke. Sounded like a putt inside the car, but more like a gunshot outside and a flame would shoot out the exhaust.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: exhaust "bangs"
[Re: paddel]
#2093655
06/17/16 07:34 PM
06/17/16 07:34 PM
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Joined: Jan 2003
Posts: 13,610 md
mopars4ever
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I Live Here
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Re: exhaust "bangs"
[Re: paddel]
#2094421
06/19/16 01:50 PM
06/19/16 01:50 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
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About to go away
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Posts: 14,889
up yours
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Lean provides more power than rich, rich provides a safety margin.
A miss is causing your "banging", it's raw fuel igniting in the exhaust, not the engine.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: exhaust "bangs"
[Re: paddel]
#2094810
06/20/16 03:53 AM
06/20/16 03:53 AM
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Joined: Apr 2015
Posts: 107 germany
paddel
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I got that it is in the exhaust. I thought, that a rich (or too rich) mixture would cause the fuel not to burn completeley, flow into the exhaust and bang.
What I also learned is that a richer mixture will provide more power. You want to have all the oxigen to be part of the burning process. To achieve that you want to use a bit richer mixture. So that every oxigen molecule has it's fuel. If you run lean, not every oxygen molecule has a "partner" and goes out unused. And how much air goes in, is regulated by your foot. So you realy want to use every bit of it. Running lean just saves fuel. That is what I've learned and it makes sense.
I hope I got that right and I am understandable. My english is far from perfect.
EDIT: I forgot to write something else. I also learned that a too lean mixture can cause misfire, because the mixture will detonate early. But I think then it would go out through the intake.
Last edited by paddel; 06/20/16 03:56 AM.
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