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Old 10-18-2000, 10:07 PM   #1
elemental
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Member#: 2701
Join Date: Oct 2000
Chapter/Region: SCIC
Location: occa
Vehicle:
'00 obs

Question Fire out the exhaust?

This is not subie related obviously. I just don't really have other sources for questions of mine of which there is no pre-prepared answer since I don't know many if any into the technicals of cars or have the knowhow to answer any kind of tech-related questions... But enough filler... Anyone want to explain why it is that some cars spit flames out the exhaust? I can't seem to reason it out with the little knowledge I've gained by reading some of these forums and other engine related texts... I've seen it in person on the street (Which im not sure is legal) but it had be smiling. Just wanted to know why it happens. Thanks.
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Old 10-19-2000, 12:19 AM   #2
Michael
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99 RS Turbo
Graphite Gray Pearl

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most of the time when a car spit fire mean that the car is running pretty rich at high rpm
when running rich down-shifting might make your exhuast spit some fire.
spitting fire out of your exhuast is not always good. Really depends on your setup and how the car is tuned.
RX-7 tend to do that a lot since its running rich most of the time. just a exhuast and header can make that possible.
one of my friends MR-2 turbo do that when down-shifting at high speed. saw it first hand when i was behind him. looks pretty cool. his set up was a header, exhuast, and change the stock turbo to a bigger one (TD06)
hope this helps
michael
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Old 10-19-2000, 09:22 AM   #3
ChaosThom
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Rally Red

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I have a 1-ton Dodge van with a 360 V-8 sporting a 4-barrel carb. Coming off the throttle quickly after hard acceleration will always cause a backfire in the exhaust. I've been told that flames have shot out as much as 2 feet.
The problem is fuel that is not burned in the engine under the condition I described. Bottom line - it's running too rich under hard acceleration.
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Old 10-19-2000, 09:35 AM   #4
silverSurfer
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hey what's up mike! stop by mah 7-11 again

chrisC
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Old 10-19-2000, 09:38 AM   #5
Michael
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sup chris
i stop by that 7-11 once a while
most of the time its mon and wed after i play some bball.
well let me know when you are going to be there or we can try to have a mini meet in flushing or something
laters
michael
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Old 10-19-2000, 10:05 AM   #6
Peaty
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I in no way recommend doing this but. When I was in High School way back when. To scare the poop out of someone next to you (and mostly destroy the exhaust); while driving down the road you could turn off the key for a few seconds and kill the ignition (no steering lock at that time to worry about) let the whole exhaust fill with unbrunt fuel then turn on the key. Kaboom, w/ flames out the back. This usually made an oval muffler round too.
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Old 10-19-2000, 10:45 AM   #7
wistful
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formen.ign.com had an article abuot this a while ago. It went from home-rigged to professional systems. I think the most basic was hooking a spark plug into somewhere near the end of the exhaust tip. This would ignite whatever didn't ignite or extra fuel or whatever. Professional were napalm-based flame throwers.

Don
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Old 10-19-2000, 10:45 AM   #8
Sunrise City Rider
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Blue Ridge Pearl

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To add to what was already said, when the exhaust valve opens, the unburnt air/fuel mixture gets sucked thru the exhaust valve and is ignited further down the exhaust pipe.
Zee
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Old 10-19-2000, 10:51 AM   #9
RidinLow
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Brings new meaning to "smoking the competition," eh?
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