coil = spark question

[Salt-Man]

if you run a spak plug right off of a coil and put juice to the coil will it make the plug start sparking ? I thought it would but when I tried it I got nothing, I am trying to build a flame thrower system for my truck

[buffs 78 ford]

No you will need a dist to break the secondary fire. Just take and get a 3 way toggle switch and a seconed coil. Wire the switch on one side to the coil to run the truck and the other side to the second coil. Flip the switch and pump the gas instant flame thrower. The power will be sent from the truck coil to the flame thrower coil.

[Salt-Man]

No thats not what I'm doing but thanks for the input, I think I found the info I want on-line, now I just need to understand it ????? >B< and I think I threw out some of the parts I need

[OX1]

if you run a spak plug right off of a coil and put juice to the coil will it make the plug start sparking ? I thought it would but when I tried it I got nothing, I am trying to build a flame thrower system for my truck


A coil will not fire the sparkplug until you put 12v across it, and then remove the 12V (like with points, when the points opened, then the plug fired). It builds up a mag field in the primary circuit of the coil with 12V connected (about 200V). When this voltage is removed, the field collapses quickly, inducting to the secondary coil, multiplying the voltage by 100 (about 20K volts), and then firing the plug. Some of the voltage inducting to the secondary coil does feed back through the primary, which an instant positive voltage source and that is what runs a tach, which is just a voltmeter that gets pulsed to produce sme reading between zero and full scale.

[buffs 78 ford]

Ok then just get an old air tank fill it with gas compress it open the valve up hold the matches kind of close and enjoy Ha HA

[Salt-Man]

I am building a propane set up, this is what I need to accomplish
http://www.youtube.com/watch?v=B6ELrb6iLGw&feature=related

[1TONAMERA]

Interesting.
Now that this is a month old, have you made the setup yet Salt-Man?
In the video, what they obviously had was some kind of signal source to make-and-break the circuit to the ignition coil. Looks to be a mix of a dual-output coil and a Ford remotely-mounted TFI module.
Perhaps that little blue thingy on the TFI module was the signal generator? Like was said, you can't get the spark just by putting power to the coil. You have to give it juice, then take it away, to get the spark. In the case of the video, they had something making and breaking at a semi-high rate of speed to get those sparks going like that.

Good luck. Let us know what you get going.

Paul