Hello everyone, I've been looking all over the internet for info about this with no luck. No useful forums, descriptions, nothing. I know it's not even a Mustang question but I need to inquire about this somewhere.

Anyway, I built this:

The base vehicle is a 1984 F150 with a 351 HO (at least it's a Ford, right?)

It's a replica vehicle from The Road Warrior, and there is a scene in the movie that has flames shooting out the exhaust. I want to do the same, and need info about it. I want the flames turned on/off with a switch, I want to rev the engine and have the flames correspond, I'd like them to be fairly big flames, and I don't want to mess with the fuel mixture.

So a propane setup would have nothing to do with revving the engine so that's out. Most other systems I've read about involve running raw gasoline through everything so that's out. But I've heard that you can have it running off the regular exhaust gas, which is flammable. So, would that work, and how big/small would the flames be with that setup?

FYI, the pipes are 5" diameter, no mufflers or anything.

Thanks for humoring your local crazy builder...

HUMVEE Driver

 

Im not sure exactly how it is done but i know a few people that have had it in their cruisers, they drilled spark plugs into the exhaust system, and had a switch they flipped to turn them on... but if you dont set it up right you can have a massive backfire

 

I don't have the slightest clue on how to to help you , but you should probably also recreate the Falcon from The Road Warrior as well, just sayin.

 

Burning the exhaust gas probably isnt what you want, you'd still have to tune it way rich. But I guess if you were running fuel injection you could get a flip switch like this:
http://www.americanmuscle.com/sct-co...1999-2004.html
and get a tune specifically to be rich enough to burn, and then be able to switch it back. It probably still wouldnt be a big flame.



Honestly I think propane would be your best bet. I'd look into either a electrically controlled pressure regulator, (I can only assume somebody makes something like that) in conjunction with a throttle position sensor.
Or see if you can "re-engineer" a pressure regulator with a vacuum fitting behind the diaphragm, kinda like a fuel pressure regulator, so when you get into it, the vacuum drops, hopefully increasing the pressure.

 

Wow.

 

whassup with the dude tied to the front?

 

It's very easy. First you need a system to richen up the exhaust a little. If you're not running the motor at MONSTROUS output then the flames will never be. You can do it off raw exhaust but you have to add fuel to it (for showy orange flames) and oxygen if you want tall blue flames . Easy way is a small bottle of propane or acetylene. You need to run a line into the exhaust right up about 6" or so from the top of the pipes. You'll also need to set up a lighting switch (2 cascading relays, easy as hell), a coil and a spark plug. When you want to activate the system turn on the gas and let it build up a second (with foot off the gas pedal, low exhaust flow or it'll blow out) then flip the switch for the lightning switch. It'll pulse the coil and the spark plug will ignite the mix.

I prefer a simpler system with a nitrous fogger as the sprayer... much more dramatic flames. Run the line so the fogger nozzle sprays upward out of the exhaust and the same sort of ignition system.

There is 1 simpler way... run your motor PIG *** RICH like 10:1 A/F ratio and stick a spark plug at the back. There'll be sufficient unburned fuel to ignite. After that, when you're ready to ignite it floor the gas for a quick blip a few times to build up some fuel vapor in the exhaust and hit the ignitor.

There was a time when I had a thing for making "agricultural" flamethrowers.