Exhaust Flamer kit

weld a spark plug into your exhaust, connect it to a (any old) coil. connect the -ve side of the battery to one side of the coil, and the +ve side of the battery via a fuse and a push switch on the dash to the other side of the coil. voila, a flame kit. push the button for flames.

'Control Box' is a circuit to fire an ignition coil repeatedly. 555 timer with a 20Hz 'square' wave output that drvies either an ignition driver chip or a transistor and relay; both to switch the earth return for a standard ignition coil and provide continuous sparks at the tailpipe.

Ok, thanks. So I take it that one of these control boxes is not necessary, just a way to make money. Thanks

When you apply a voltage to a coil, you build up a magnetic field inside. When you remove the voltage suddenly, the field collapses, and because of the inductance of the coil, you get a very large voltage spike - large enough to exceed the breakdown voltage of air and cause a spark. So you DO NEED something to apply a field and then remove it. In a flamer system, you need to do this fairly rapidly, which you can do yourself, in priciple) using a push switch, or you can buy/make a circuit to do it for you much more reliably and easily.

Er, no. It is neccessary - else you'll noyl get the one spark which likely won't ignite anything - so you'd be clicking away at the on-off switch for yonks trying to get something going and likely failing.