What causes exhaust flash ?

  • Thread starter Thread starter Westwind
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Westwind

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While watching auto racing on TV recently, I noticed as the cars
braked hard for a sharp turn, a flash would come from the exhaust as the cars down-shifted. What causes this? And does it do any harm?
 
When the car engine is under a no-power condition before a turn, there is unburned fuel mixture entering the exhaust system. It then ignites in the exhaust from the intense heat in there.
 
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