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Farmall & IHC Tractors Discussion Forum
:

BACKFIRE WHEN THROTTLING DOWN

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warren woodrow

04-15-2019 09:12:28




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424 runs pretty well . Has updraft carb. When it is running wide open and I THROTTLE DOWN HARD IT POPS SEVERAL TIMES THROUGH THE MUFFLER. WHAT CAUSES THIS ?




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warren woodrow

04-15-2019 13:40:46




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 Re: BACKFIRE WHEN THROTTLING DOWN in reply to warren woodrow, 04-15-2019 09:12:28  
Quoting Removed, click Modern View to see

Thanks to all. I kind of like the sound of it, actually .



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Janicholson

04-15-2019 10:35:24




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 Re: BACKFIRE WHEN THROTTLING DOWN in reply to warren woodrow, 04-15-2019 09:12:28  
As noted High vacuum operation decelerating down a hill or just closing the throttle. Unburned fuel in the exhaust is ignited by cylinder flame from a open exhaust valve. Pow. Normal. Jim



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Bob M

04-15-2019 10:15:11




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 Re: BACKFIRE WHEN THROTTLING DOWN in reply to warren woodrow, 04-15-2019 09:12:28  
Pretty much normal for your tractor. The distributor has no vacuum advance to advance the spark under high manifold vacuum conditions (throttling down from full RPM).

Recommend check that idle timing is at spec, also that the centrifugal advance is working. Otherwise just ignore the backfiring - it will cause no harm.



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Bob

04-15-2019 09:41:48




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 Re: BACKFIRE WHEN THROTTLING DOWN in reply to warren woodrow, 04-15-2019 09:12:28  
An exhaust leak that allows air to enter the exhaust as you throttle down can cause/aggravate "backfiring".



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centash

04-15-2019 09:32:28




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 Re: BACKFIRE WHEN THROTTLING DOWN in reply to warren woodrow, 04-15-2019 09:12:28  
Possibly running too lean, or running too hot. Shouldn't hurt much, just reduce the rpms slowly.

Ben



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