Shoot Flames from exhaust -- Tips/ advice welcome!! - Motorcycle-Journal Forums

BenchFalco · 11-13-2004, 01:09 PM

I have a few mods planned for the winter for my bike. (See other posts)

To shoot fire, I plan to install an extra ignition coil linked to my exhaust pipe drilled and tapped blah blah.

What I plan to do is wire an (extra) ignition coil, in parallel, from the primary inputs of (one of) the existing coils and share the incoming power between the two coils.
Example: One for cyls 1, 3 and the other for 2 spark plugs drilled/tapped into the exhaust tip. The other coil (for cyl 2,4) will remain untouched......maybe

I intend to use a single coil with two plugs in my, single, aftermarket exhaust because a single coil has 2 plug leads already attached AND the two plugs will fire alternately (the same time as cyl. 1,3 for example) giving a more steady flame.....potentially?!?

QUESTION: Would it be better to disconnect one of the leads from the "fire" coil and use only a single plug? (but then it will only fire once for every 1,2,4,3 fire sequence as the engine runs) Or would it be better to use both of my extra ignition coils and wire four spark plugs into the exhaust tip, which would fire in sync with the engine?

I am concerned about the energy draw that the extra coil (or two coils) will take from the ignition system. So I am wondering what would be "the best" thing I could do given my situation. Use 1 plug, 2 or 4??? I'm not conidering using 3 because that would be the same as using 2 plus 1. And would cause an unever power draw that same as using only 1 plug. But maybe one is better than 2, draining less power? Or would four be better because the drain from the existing coils will be equal. What's the best combination? Minmal, but uneven power draw, or more draw, but equal? I have the variety to use two coils divided between 4 plugs and anything in between. What would be the BEST overall?

I plan to do it this way so that the bike can continue to run while I am shooting flames, burning unused fuel in the exhaust gases.
I want to be able to switch on the fire "on the fly", but mostly this will just be a stoplight trick. Not planned for (excessive) use while the bike is under load.

.... but it would be neat to see how far the flames could stretch out while flying down the highway at high speed

..... maybe it would be best this way anyway as I reach the point where I am about the float the valves. ha ha

I have shot flames from the exahust before, but that was just because the previous owner of the bike never had his valves adjusted properly. All I had to do was give it a big shot of throttle and shut it quickly then there would be a huge backfire BANG!! and a flame for a split second. I discoverd this accidentally and only did it a couple times....didn't want to destroy the bike. The bike is completely tuned now.

I can give more details about my plan if what I have written above is not entirly clear.

If anyone can point out any potential problems (or a better method) to accomplish what I have planned above it would be appreciated.

I'll be sure to post some pics as soon as I get lit up!

Thanks

"My mother never saw the irony in calling me a son-of-a-%%%%%." Jack Nicholson