Home » Public Forums » GMCnet » Exhaust bang bang bang (going down steep grades)
[GMCnet] Re: Exhaust bang bang bang [message #366783 is a reply to message #366779] |
Tue, 14 September 2021 19:21 |
James Hupy
Messages: 6806 Registered: May 2010
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Senior Member |
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I did that same thing with my 1938 Oldsmobile. Blew out the muffler, and
broke a couple of valve springs. That ended that engine, and allowed me to
swap in a 303 Olds V-8. And Headers, and dual exhaust.
You have something hot enough inside the exhaust system to ignite a
combustible mixture of gasoline and oxygen. If you get rid of either one of
the three things I just mentioned, you will stop the banging. I would
concentrate upon the gasoline source if it were me. High engine rpm on
deceleration creates a very high vacuum with nearly closed throttle plates.
If they are open a bit too far, then air and fuel can enter the exhaust
system unburned, where it is ignited by hot exhaust components. Air can
also enter via worn throttle shaft bushings, even with throttle plates
closed. Time for a very close inspection of your carburetor. Just what I
would do.
Jim Hupy
Salem, Oregon
On Tue, Sep 14, 2021, 4:36 PM Bill Van Vlack
wrote:
> With a couple EFI systems I have, you can turn on or off 'Deceleration
> Enleanment' and allow/disallow that burble. I used to turn off/on the
> ignition
> Dad's Dodge while coasting. BANG! I don't suppose that helped the muffler
> much.
>
> --
> Bill Van Vlack
> '76 Royale; Guemes Island, Washington; Twin bed, full (DS) side bath,
> Brazilian Redwood counter and settee tops,455, 6KW generator; new owner a/o
> mid
> November 2015.
> _______________________________________________
> GMCnet mailing list
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Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 11:18
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Re: Exhaust bang bang bang
By: JohnL455 on Tue, 14 September 2021 15:27
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[GMCnet] Re: Exhaust bang bang bang
By: Keith V on Tue, 14 September 2021 16:38
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Re: [GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 21:17
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 19:11
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Re: Exhaust bang bang bang
By: boybach on Tue, 14 September 2021 19:18
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Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: Exhaust bang bang bang
By: JohnL455 on Wed, 15 September 2021 08:18
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 11:20
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[GMCnet] Re: Exhaust bang bang bang
By: sgltrac on Wed, 15 September 2021 11:32
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 12:35
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Re: [GMCnet] Re: Exhaust bang bang bang
By: mghamms on Wed, 15 September 2021 15:17
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Re: [GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 21:29
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[GMCnet] Re: Exhaust bang bang bang
By: sgltrac on Wed, 15 September 2021 16:08
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:07
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Wed, 15 September 2021 17:13
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 21:32
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Wed, 15 September 2021 21:38
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Re: Exhaust bang bang bang
By: JohnL455 on Wed, 15 September 2021 15:56
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:03
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Re: Exhaust bang bang bang
By: boybach on Wed, 15 September 2021 17:17
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Re: Exhaust bang bang bang
By: boybach on Thu, 16 September 2021 14:54
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[GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Thu, 16 September 2021 21:11
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[GMCnet] Re: Exhaust bang bang bang
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 09:28
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[GMCnet] Re: Exhaust bang bang bang
By: jimk on Fri, 17 September 2021 09:47
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 10:40
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[GMCnet] Re: Exhaust bang bang bang
By: Rob on Fri, 17 September 2021 11:22
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Re: [GMCnet] Re: Exhaust bang bang bang
By: boybach on Fri, 17 September 2021 11:39
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