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You have to get enough unburnt fuel back to the tips to get any flame. Sometimes you have to rev it up and kill the ignition before igniting the flames. Watch out for any exhaust leaks or turning the ignition back on too soon (blown mufflers)
I've used them before...
We had a 79 ford w/ 302 that would shoot flames w/o having propane or sparkplug in the pipe...
The one that we ended up with had a coil wire running to the back with a switch and a propane injector into the pipe. Its been a really long time since weve done it, but it can be done
Well I was in a Hot Rod Club in the 50's and the guys used to talk about these. but I never saw one working. Back then it was tap a sparkplug into the exhaust pipe, and run the engine rich using the choke. I would guess that the plug was energized with a Model T coil- you used to but them at Western Auto, they were wood cased with a set of points mounted on top. We did make some hellacious "shockers" using them, and they worked great! Used to be a way to make your car theft proof, and you used a toggle switch with a lenght of rubber fuel line clamed on it for the ON/Off, hanging down in a fender well. One touch, and you stayed away from THAT car, man it hurt to touch one!
I was just looking at the web page for the "Trucks!" tv show on TNN (http://www.truckstv.com/) and saw that next week or soon (not sure of the exact date) they're going to install a flame thrower on one of their project vehicles and show you how it works.
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