Flames from Exhaust Stacks
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Senior User
Joined: Jan 2003
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From: Prairieville, Louisiana
Flames from Exhaust Stacks
I'm dropping a 460 in a 1987 F-150, and I'm putting smoke stacks on it. I've heard of a way to make flames come out the top by wiring a spark plug at the end of the pipe and running really rich gas. I figure i could wire it to a open throttle nitrous switch that would make the spark plug ignite at full throttle and lite the gas fumes on fire.
You think it would work?
You think it would work?
Mountain Pass
Joined: Jul 2004
Posts: 183
Likes: 4
From: Indiana
I believe the technique used is to put the spark plug in, and a manual choke. go to full choke, until it almost dies, then romp the gas pedal and open the choke. She'll belch out some pretty good flames.
Freshman User
Joined: Sep 2003
Posts: 44
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From: Peoria
Opening the choke will work quiet well. I have a fuel injected 460 in my truck my muffler was pretty much gone and so was my cat. I had an exhaust leak at the manifold and the y-pipe all I did was taking it up to about 3200 RPM and let off and i could get a good flame out of my stock exhaust.
Elder User
Joined: Sep 2003
Posts: 785
Likes: 1
From: colorado
the way I've seen it done is put a switch in the positive coil wire so you rev it up and kill the spark and push some unburned gas into the exhaust. then turn it back on with the spark plug in the exhaust and it lights up the gas throwing flames out. thats the way the old hot rodders do it.
5th Wheeling
Joined: Nov 2004
Posts: 44
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http://www.geocities.com/CapeCanaver...22/coildrv.htm
Hope this helps. You could probably run some type of fuel sprayer into the exhaust before the spark plug for some meaty flames.
Hope this helps. You could probably run some type of fuel sprayer into the exhaust before the spark plug for some meaty flames.
Posting Guru
Joined: Feb 2002
Posts: 2,404
Likes: 3
From: Cleveland, WI USA
You can do it by choking out the motor, but you'll also get a lot of gas washing down the cylinder and into your oil. It's a good way to do some damage. I know they sell kits that cut out a plug or two, but they're pretty expensive and still spill gas into the oil.
The ideal way is to inject fuel with nitrous fan spray nozzles, electronic solenoid, and a fuel pump from a FI engine (carbed engine fuel pumps don't have enough pressure). The nozzles should be about 8" into the pipe with the plugs about 1-2" from the end.
The fuel is actually the easy part. It's the electronics that most people get stuck on. First off, a spark plug needs about 20,000 volts to jump the gap, so a wire from the battery won't do it. You need to have a coil to jump up the voltage. You also need to pulse the power to the coil as the coil discharges when you cut the power to it. A relay works really well for that if you wire it up right. You'll also need a capacitor which you can get off the old Ford voltage regulators and coils, or from a lawnmower engine.
I've built the curcuit like the link shows with the 555 timer circuit from RadioShack, but I prefer the solid state one I made later. Look here for my diagram and description. It costs far less than the kits and it's made from stuff most people have lying around.
Kevin K.
The ideal way is to inject fuel with nitrous fan spray nozzles, electronic solenoid, and a fuel pump from a FI engine (carbed engine fuel pumps don't have enough pressure). The nozzles should be about 8" into the pipe with the plugs about 1-2" from the end.
The fuel is actually the easy part. It's the electronics that most people get stuck on. First off, a spark plug needs about 20,000 volts to jump the gap, so a wire from the battery won't do it. You need to have a coil to jump up the voltage. You also need to pulse the power to the coil as the coil discharges when you cut the power to it. A relay works really well for that if you wire it up right. You'll also need a capacitor which you can get off the old Ford voltage regulators and coils, or from a lawnmower engine.
I've built the curcuit like the link shows with the 555 timer circuit from RadioShack, but I prefer the solid state one I made later. Look here for my diagram and description. It costs far less than the kits and it's made from stuff most people have lying around.
Kevin K.
Elder User
Joined: May 2004
Posts: 565
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From: saxton pa.
Flamethrowers
If you use a gm HEI dist and drive it with a heater motor you have instant high
voltage, weld a bung into your exh pipe at the elbow for a sparkplug. Close by
weld another bung for a fuel jet, you can use gas or propane. Half of the plug
wires to one pipe half to the other. Works real good
HOTWRENCH
voltage, weld a bung into your exh pipe at the elbow for a sparkplug. Close by
weld another bung for a fuel jet, you can use gas or propane. Half of the plug
wires to one pipe half to the other. Works real good
HOTWRENCH
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Senior User
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From: Prairieville, Louisiana
Thanks kjkozak2 your link for the diagram really helps. I can't wait to do it. It will be sweet and turn alot of heads. Just gotta wait until the new motor is in my truck. I cant wait to see people's faces when they see a f-150 with a 8' suspension lift and a 3' body lift with smoke stacks belching out flames as it goes down the road. Can you say "SWEET!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!"
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Posting Guru
Joined: Feb 2002
Posts: 2,404
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From: Cleveland, WI USA
You need to be careful, obviously. Several safety mechanisms should be in place when you do this. Things like a wide open throttle switch that prevents the plugs and fuel injection from turning on unless you have the gas pedal down. There are also several others and you can read about them HERE.
This guy does it professionally and knows pretty much everything about it.
I have my system installed and ready for testing, but I took the interior of my cab apart so it's a little tough now.
Kevin K.
This guy does it professionally and knows pretty much everything about it.
I have my system installed and ready for testing, but I took the interior of my cab apart so it's a little tough now.
Kevin K.
Posting Guru
Joined: Feb 2002
Posts: 2,404
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From: Cleveland, WI USA
My flame project is still on hold.
I tested it and got nothing. The fuel pump I was using doesn't have enough pressure to atomize the fuel. I need to get an in-tank pump with higher pressure. Hopefully by the end of the winter I'll have it working.
K.
I tested it and got nothing. The fuel pump I was using doesn't have enough pressure to atomize the fuel. I need to get an in-tank pump with higher pressure. Hopefully by the end of the winter I'll have it working.
K.
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