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Answer it!
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either checkout my tutorial with images, at http://projectracenation.yolasite.com/flaming-exhaust-mod.php
or read on below for the same info
The easiest of course is to find a kit, most are relatively cheep, and work fine, but for a do it yourself guy you can find cheaper ways to accomplish your fire spewing goals.
For one, you can remove the catalytic converter, so more flammable material makes it through your exhaust system, of course you may never pass smog again, but thats the price for fire. Then mount a few things under the dash, find yourself a cheep igniter coil, for around ten bucks, two spark plugs, a dash switch, any will do, but a switch that exhaust stay ON is the safer choice, and about 17 feet of red wire, and green wire. Now you'll want to run a wire from your battery to your switch to the new coil which can be mounted just about anywhere, then run a wire from the coil to your exhaust pipe. Drill two holes in the pipe near the end, one on either side, screw in the spark plugs then solder the wire to them, run the opposite color of wire to the top of the igniter coil, then use remaining wire to connect the remaining igniter coil terminal to your battery. When you flip your trigger switch it will fire the igniter coil and cause the spark plugs to arc, when the engine is running, preferably revving at high RPM, the exhaust and its flammable carbon and gasoline fumes are blown past the arcing spark plugs which do their job proficiently and ignite the fumes as the exit the pipe, thus creating bursts of brilliant flame lasting from 1 to ten seconds. For more continued flames you could create a propane fed trigger nozzle inside your exhaust pipe slightly up from the spark plugs, wire this system into the same switch as your spark plug so when you flip it, the spray valve opens, releasing a stream of highly combustible propane into your system, its own force plus the exhaust force would propel the propane past your spark plugs igniting it and firing long steady flames for as long as the propane is supplied.
Using this system is safe as long as not miss-used, and i am not responsible for any accidental injury or destruction of property.
Any way this works on carbed vehicles where you can choke the carb.
What you do is put a spark plug into the exhaust by drilling a hole in the pipe and threading the plug through it. Then you take a wire and splice it to one of your spark plugs and run it back to the spark plug you just installed. then just pull the choke and it will overload the engine with fuel. the excess goes into the exhaust, where your spark plug lights it.
Flames shoot about 6 to 10 feet depending on how much fuel you have overloaded into exhaust.
As far as without a carbed vehicle, My only suggestion would be to install a splice into the fuel line with a backflow preventer and a second fuel pump. put some kind of adjuster on it like a reohstat and an on of switch so you can control the speed of the pump and then hook output of the pump to the exhaust before the spark plug. I would suggest some kind of injector nozzle so you could "mist" the fuel as it went int o the exhaust fuel.
This way when the vehicle is running the exhaust fumes would carry the fuel injected from the second fuel pump to the spark plug, then it would be ignited by the spark plug.
Because the spark plug only works when the vehicle is running and the exhaust is what makes your fuel carry itself past the plug, the only problem with this would be if you attempted it as the vehicle was off. , it might expel fuel into the exhaust then when you start the car it would ignight a pool of fuel causeing a explosion. so you would want to hook the fuel pump on off switch to a fuse that only works when the car is on.
Ive never tried it like that but i see no reason why it wouldnt work.
Most of the stuff you could pick up from a junk yard or parts store. If you have a carbed vehicle, you could make a fire kit for like 5 bucks, but without the carbed vehicle the most expensive part would be the pump.
also if you do this make sure to give the vehicle ample time after you fire your exhaust, to air out all of the gas before shutting it off, or dont start it until the gas has time to eveaporate afterward, otherwise if you atart the car and the spark plug ignites a pool boom.
hope this helps you some.
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