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Old 05-01-2001, 11:26 AM   #1
wop
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Post what causes fire out of the exhaust?

on a turbo charged car, I see (vids), hear and read about the flame out of the exhaust. what causes this? is it excess fuel (running too rich), that gets heated and ignites as it goes thru the exhaust track, or what?

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-wop
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Old 05-01-2001, 02:09 PM   #2
DLC
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An excessive amount of stickers on the car keeps the paint from breathing and it has to vent via the exhaust pipe.

Also, too much rice-alcohol causes major engine problems and indigestion.

Or, unburnt fuel and anti-lag systems can do it too.
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Old 05-01-2001, 04:04 PM   #3
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<center> </center>
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Old 05-01-2001, 04:08 PM   #4
SuperFreq
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I thought that the flames out the tail pipe were from the system they use to prevent turbo lag. Don't they inject fuel and ignite it before(or after, not sure) the turbo to keep it spinning? I could be wrong.
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Old 05-01-2001, 04:42 PM   #5
bsquare
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Most cars that do that little fire breathing trick don't have anti-lags (how much use do anti-lags see outside of rallying?). They are just spewing so much unburnt fuel and the exhaust is so hot that it ignites when it finally hits the oxygen-rich air.
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Old 05-01-2001, 10:45 PM   #6
pretz
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Quote:
I thought that the flames out the tail pipe were from the system they use to prevent turbo lag. Don't they inject fuel and ignite it before(or after, not sure) the turbo to keep it spinning? I could be wrong.
that should be the mis-firing system on the WRC cars... if not mistaken
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Old 05-01-2001, 11:07 PM   #7
bsquare
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It's not misfiring, it is the anti-lag as described above (unburnt fuel intentionally injected into the exhaust before the turbo through various means, then ignited to keep the turbo spinning).
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Old 05-02-2001, 12:07 AM   #8
SuicidalLabRat
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the old bandanna in the tail pipe trick!?

SLR-
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Old 05-02-2001, 12:26 AM   #9
Narcisse91
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Basically, running too rich is required, and if the cats are doing the job, you shouldn't be able to do it, so you can't have a (functional) cat in there. On top of that, you need to either have very little backpressure, or a lot of pressure from the engine to get the flame that far down the pipe, or something in the tailpipe to ignite the unburnt fuel.
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Old 05-02-2001, 12:48 AM   #10
Thug
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Do a search. there was a long thread about this not too long ago. But yes, it does involve unburnt fuel.

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Old 05-02-2001, 12:55 AM   #11
MY99 2.5GT
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You could wire a spark plug into your exhaust pipe that would ignite the exhaust fumes. That good for a nice fireball.

Sorry I jsut thought I'd add that. My friend did this on an old Chevelle. It was really funny to see this fireball burst from his exhaust pipe.
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Old 05-02-2001, 04:13 PM   #12
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Strange explanations you are all coming up with...I always thought it was done by disgruntled gnomes that live in the tailpipes. They live back there and have an endless supply of Bacardi 151 (it's all they have to live off of). Every once in a while they just can't take down the 151 and spit it out...since 151 is flammable and it's hot in the exhaust, you get flames out the tailpipes. I hear them, I swear...but maybe that could just be my imagination.
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Old 05-02-2001, 04:27 PM   #13
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We won't stop until we've got underpants!
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Old 05-02-2001, 04:35 PM   #14
Wreckleford
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On anti-lag systems they do not inject fuel into the exhaust, they retard the timing and/or skip sparks so that unbrunt fuel flows through the cylnder and out the exhaust valve. When it touches the hot manifold it ignites creating a pressue wave which keeps the turbine spinning.
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Old 05-02-2001, 06:11 PM   #15
SubaFast1
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hehehe, my car shoots flames very often!
Hmmm should I fix it?
or keep it?
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