Flamethrower exhuast
Freshman User
Joined: Feb 2005
Posts: 27
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From: sc montana
flame thrower
Ok guys, heres what you do. 1st put spark plugs 4-6" from the end of your tail pipe. Next mount a coil ( a Harley Davidson coil works perfect for dual pipes) ground pipes, ground coil through mount. Find a toggle switch that has 2 circuits (6 contacts) on one side run wires from + and - of HD coil, and on other side + and - of vehicle coil. in the center positions you connect ign (+) and distributor (-). Hook up a spark plug wire to each of the coil outputs to each pipe. Now when you rev up your engine to build a bit of a rich condition ..... then switch from your engine coil to the Harley coil. The engine pumps out the rich mixture strait thru to the exhaust and the harley coil and tailpipe plugs ignite it. You get an impressive display and then toggle back to your engine coil before it dies. This does work!! Thats how we do it!
Sorry Guys with Catylitic Converters this won't work !
Sorry Guys with Catylitic Converters this won't work !
Lead Driver
Joined: Feb 2003
Posts: 8,140
Likes: 4
From: Oak Harbor, OH
Actually wlinthr that'ts not entirely correct. Take the coil wire off, hook it to a spark plug, ground the plug and have someone crank the engine. Ever hear of points? Do you know what they do? The break the ground going to the coil telling it to fire. The same thing happens from the PIP sensor in a newer electronic system. You're right about the constant voltage from coil. That's because at the rpms it takes to start or run a multi-cylinder engine the coil is firing very rapidly, creating a seemingly continuous spark.
Elder User
Joined: Jun 2004
Posts: 540
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From: Northern MD
Go Here: http://www.flamethrowers.com/ They have a good description of how to hook everything up. There must be a better way to shoot flames then to run a lot of unburned fuel through your engine. If you do a search, I bet you'll find someone who does it another way, with better results.
Postmaster
Joined: Feb 2003
Posts: 4,043
Likes: 4
Thankyou Pfogle. Wlihntr and anyone else interested check this out:
http://www.jlctech.net/ign.html
An automotive ignition coil is basically a step-up transformer. Transformers do NOT work on DC current as in our vehicles.
http://www.jlctech.net/ign.html
An automotive ignition coil is basically a step-up transformer. Transformers do NOT work on DC current as in our vehicles.
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Senior User
Joined: Aug 2003
Posts: 141
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thanks skidly, and everyonoe else. but i was wondering, how do i splice into the distrubutor? or do i just splice into the coil? since there is only really on wire that supplys power to the distrubutor. also the superflames.com site really helped out. thanx for the help guys.
Postmaster
Joined: May 2002
Posts: 3,241
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From: Broken Arrow, OK
Originally Posted by wlihntr
"YOU DONT NEED TO TURN THE COIL ON AND OFF"
Senior User
Joined: Jan 2005
Posts: 174
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From: Lynchburg Virginia.
Flame-thrower exhaust are really cool, I remember seeing them around town when I was a kid in the 50's.
One thing I noticed in the thread though was a basic misunderstanding of how a coil works. If you wire it up direct, when you cut the switch on nothing will happen. When you cut the switch off the plug will fire one time.
The voltage to fire the plug is produced when the magnetic field caused by the ignition circuit collapses. Thats why the points were there, to turn the circuit on and off. A heavy duty signal flasher may work if there is enough voltage flow.
Anybody ever see one of the old moonshine cars with a system on it to inject burnt motor oil into the exhaust manifolds? They could put out one heck of a smoke screen. Somthing like that may work, use an old co2 bottle with a remote trigger.
One thing I noticed in the thread though was a basic misunderstanding of how a coil works. If you wire it up direct, when you cut the switch on nothing will happen. When you cut the switch off the plug will fire one time.
The voltage to fire the plug is produced when the magnetic field caused by the ignition circuit collapses. Thats why the points were there, to turn the circuit on and off. A heavy duty signal flasher may work if there is enough voltage flow.
Anybody ever see one of the old moonshine cars with a system on it to inject burnt motor oil into the exhaust manifolds? They could put out one heck of a smoke screen. Somthing like that may work, use an old co2 bottle with a remote trigger.
Elder User
Joined: Sep 2004
Posts: 631
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From: P-Town, CA
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Freshman User
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From: sc montana
You do need something to trigger the coil or coils, in my previous post the solution was to use the vehicles existing distributor points , whathave ya. You could also use a model T coil, they trip there own trigger (so to speak) ..... or you could make you a simple buzzcoil here is a link http://royalcrossfarm.com/BOZZCOIL.htm give that a try. Only thing is, any of these will only work with carburated engines with NO CAT! have fun, and don't start no fires ... LOL
Postmaster
Joined: Jan 2004
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From: colorado
Originally Posted by Silver Streak
Yes you do. If you put power to a coil and leave it on there you have a very big resistor. A coil operates by storing a charge in a coil by inducing a magnetic field in the primary windings. When the power to the coil is shut off the magnetic field collapses and the energy stored must escape somewhere. It escapes through the secondary windings to the plug wire. If the coil produced a spark constantly there would be no way to control ignition advance and no way to make a cap and rotor live.
Freshman User
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From: sc montana
in coils, except for a buzzcoil, the only time you get a spark is when the circuit is energized and broken (points open and close in a point style ignition) a rotor passing a trigger point in an electronic ignition
Freshman User
Joined: Feb 2005
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From: sc montana
won't happen
You probably can't get a continuous flame no matter what you do, unless you add some kind of injection system into your exhaust. You usually get only a few seconds of flame at a time. If you could manually switch off and on (at a rate of 4 to 5 cycles a second) for about 5 or 6 seconds .... it might work. LOL, but that might take allot of practice!
do it the easy way, trigger it with your distributor or make a buzzcoil
PS- CAUTION! If you just try a coil to a spark plug ..... 1 spark at a time .... you may blow your tailpipe off!!!
do it the easy way, trigger it with your distributor or make a buzzcoil
PS- CAUTION! If you just try a coil to a spark plug ..... 1 spark at a time .... you may blow your tailpipe off!!!
New User
Joined: Jul 2005
Posts: 1
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I have to agree with Skidly. You won't ever throw an arc by just hooking up a car battery to a coil. You either need to have pulsing DC or possibly AC to make an arc. You could also build a small flyback transformer Tesla Coil and hook that up to you spark plug.
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