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Spark system for a metal combustion

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Spark system for a metal combustion

Unread postAuthor: douggie » Sat Sep 05, 2009 4:49 am

I am currently in the proces of making my 2nd spud gun but this time im making it out of metal!!!
I found an old grease gun to use for the chamber..
One end has a hole in it so u can pump the gun so i filed this out big enough to fit a piece of gall pipe that i found(a bit bigger than a average marble)
i have welded the gall to the now end cap (took a bit of effort but it has came up alright)
Now i am going to jsut weld a base on it wih a bit of 4mm steel i found..
But before i do this i need to put the spark in it.. I only wont something simple preffibley a bbq ignitor nothing fancy..
Will the sparker work in metal chamber i want to put two scewrs in it like my oother 1..
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Unread postAuthor: Moonbogg » Sat Sep 05, 2009 5:33 am

You have to isolate to wires. If they are shielded just run them in the chamber and keep the spark away from the chamber walls.
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Unread postAuthor: mark.f » Sat Sep 05, 2009 9:32 am

You can use one wire that is insulated as the "hot" wire, and then use the chamber walls as the "ground".

I.E. - one wire is well insulated from the chamber walls (via rubber coating, epoxy, etc.... or you can use a spark plug), and the other wire is simply soldered to a spot on the metal chamber. The spark will jump from the hot wire to the chamber wall, or in the case of a spark plug, the electrode to core.
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Unread postAuthor: starman » Fri Sep 11, 2009 12:34 am

Why is this in the Cannon Showcase??
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