2007-08-02 12:50:57 · 14 answers · asked by dolfanatic314 2 in Sports ➔ Auto Racing ➔ NASCAR
It's raw, unburned fuel that gets past the exhaust valves during snap deceleration, & it ends up in the tailpipes, which run hot enough to actually ignite it.
2007-08-02 14:22:28 · answer #1 · answered by schizophreniabeatsdiningalone 5 · 4⤊ 1⤋
There are good answers above but this is a little more detail for those interested.
When the engine is at full throttle the intake manifold and the intake runners are full of an air/fuel mixture (air and fuel mixed together as a fluid). When the throttle is suddenly closed the velocity in the manifold and intake runners drops dramatically causing the fuel to drop out of suspension and puddle at the bottoms of the runners. This fuel passes unburned (because of a lack of oxygen) thru the combustion space and the first part of the header while being heated to above it's flash point but lacking enough oxygen to burn completely. When it gets near the end of the exhaust system it reaches oxygen containing air and bursts completely into flame. Under some conditions you can actually see the flame start out side the exhaust exit point.
2007-08-02 23:16:39 · answer #2 · answered by beth 6 · 2⤊ 1⤋
The car is backfiring, but it is from the excess fuel that enters the exhaust manifold from the carburetor.
2007-08-06 11:46:50 · answer #3 · answered by kid rock 5 · 0⤊ 0⤋
Driver goes from full throttle to none in a split second. the unspent fuel that has already passed the throttle body is forced through the main block un ignited due to the lack of correct air/fuel mixture (Flooding). The exhaust piping system is so hot that its able to ignite the unspent fuel which in turn creates the "blow torch" effect.
2007-08-02 20:48:01 · answer #4 · answered by 24DupontWatcher 3 · 3⤊ 1⤋
The flames that you see are the result of running too rich of a mixture of fuel. It is the result of the higher octane that is not burned off and it usually happens when they are off the throttle rolling through the corners.
2007-08-02 20:43:30 · answer #5 · answered by Anonymous · 2⤊ 1⤋
The car is backfiring, but it is from the excess fuel that enters the exhaust manifold from the carburetor.
2007-08-02 19:54:46 · answer #6 · answered by answersmaybe 2 · 3⤊ 1⤋
Its the car backfiring!
2007-08-02 20:16:39 · answer #7 · answered by GODSMACK#1 4 · 2⤊ 1⤋
Raw fuel entering the engine upon deceleration.
2007-08-02 19:53:48 · answer #8 · answered by Grumpyoldfart 3 · 4⤊ 2⤋
that is when excess that enters the exhaust manifold from the carburetor
2007-08-03 08:58:27 · answer #9 · answered by Anonymous · 0⤊ 1⤋
car is backfiring
2007-08-02 23:00:05 · answer #10 · answered by ? 5 · 0⤊ 1⤋