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Exhaust pipe popping

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Old 07-26-2014, 05:32 PM
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Mike1968
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Default Exhaust pipe popping
What is the cause for exhaust popping while downshifting at higher RPM in 68 327 w/Q Jet carb
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Old 07-26-2014, 07:03 PM
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TheSkunkWorks
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Unspent fuel igniting in the exhaust system on what is referred to as "overrun". This results in the flames you see when this occurs in many a racing car. ...and on the occasional C2/C3 with sidemount headers, if sufficiently stout.
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Old 07-27-2014, 08:40 AM
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Mike1968
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Default Exhaust Popping
Originally Posted by TheSkunkWorks
Unspent fuel igniting in the exhaust system on what is referred to as "overrun". This results in the flames you see when this occurs in many a racing car. ...and on the occasional C2/C3 with sidemount headers, if sufficiently stout.
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Thank you for the information.
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