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Ignition types

Built a combustion cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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Ignition types

Unread postAuthor: Potato Demon » Sat Oct 27, 2018 10:04 pm

Hi, I was wondering what the best ignition (other than a stun gun) is for spud guns. I generally use 2 nails and the piezoelectric thing from a bbq lighter but I have heard that grill igniters work better. So if anyone knows of any other (under $20 ideally) ignition sources please let me know.
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The weird thing is my only source of compressed air is a bike pump!

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Re: Ignition types

Unread postAuthor: keks2033 » Sun Oct 28, 2018 5:29 am

Potato Demon wrote:Hi, I was wondering what the best ignition (other than a stun gun) is for spud guns. I generally use 2 nails and the piezoelectric thing from a bbq lighter but I have heard that grill igniters work better. So if anyone knows of any other (under $20 ideally) ignition sources please let me know.

Image it is a gas lighter, it works on 220 volts. This is the best initiator I have used, it ignites almost any mixture. I need a battery, a boost converter and a capacitor, I took this circuit from the old camera.price about 1.5 dollars
Image
Image there are still lighters. Powered by batteries, provides continuous spark while the button is pressed. Also a good initiator, but a spark is weak. Price 1 dollar
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Re: Ignition types

Unread postAuthor: Potato Demon » Sun Oct 28, 2018 3:55 pm

I might just go ahead and modify a cheap arc lighter.
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The weird thing is my only source of compressed air is a bike pump!

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Re: Ignition types

Unread postAuthor: Labtecpower » Tue Oct 30, 2018 5:05 am

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Re: Ignition types

Unread postAuthor: jimmy101 » Thu Nov 01, 2018 11:34 am

Potato Demon wrote:Hi, I was wondering what the best ignition (other than a stun gun) is for spud guns. I generally use 2 nails and the piezoelectric thing from a bbq lighter but I have heard that grill igniters work better. So if anyone knows of any other (under $20 ideally) ignition sources please let me know.
"Work Better" is misleading. Either the spark works or it does not. Not working is a PITA but even a cheapo piezo, if setup correctly, will work basically all the time if the mixture is correct. A hotter spark won't increase the power of the gun.

The only times a more complex sparker might be needed is if you use multiple spark gaps or you are doing a hybrid.

For a combustion, the most important thing is getting the mixture right. Everything else is pretty much irrelevant if you can't get the right amount of fuel in the chamber.
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