Ignitor not working/no spark

Boom! The classic potato gun harnesses the combustion of flammable vapor. Show us your combustion spud gun and discuss fuels, ratios, safety, ignition systems, tools, and more.
PhantomCougarJT5
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Mon Jun 14, 2021 2:47 pm

I decided to make my spud gun so there is 4 different sparks in the combustion chamber. The problem is when i first rigged it up it was making a spark everytime I clicked the igniter, i leave it sit for a few hours and then go and get ready to shoot it and I check to make sure theres a spark and there isn't one (theres 4 different sparks). This has happened multiple occasions. The gun is pvc and I use screws that are drilled into the combustion chamber and the screwes are about 1/6 of an inch apart. I have shot this gun many times when i used to have only one spark in it and this wasn't a problem.
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mark.f
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Wed Jun 16, 2021 7:46 am

What kind of igniter are you using? And can you describe how you have the electrodes wired up?
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Moonbogg
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Thu Jun 17, 2021 12:31 am

The sparking may be unreliable because the gap is pretty big and there's 4 of them that the electricity has to jump across. If it worked reliably with 1 gap, then I think this might be the issue. It could be something else, but I think there's too much resistance the current is trying to jump through.
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