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my spud gun wont work

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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my spud gun wont work

Unread postAuthor: stemargia » Sun Aug 10, 2008 4:00 pm

i have a spud gun of pvc the combution chamber is about 25 centimeters and my barrel is about 45-50 centimeters
But the question is if i put hairspray or deo in my chamber and i close it and i press button to ignite(bbq igniter) nothing happens but when i open the end-cap and i ignite fire comes out of the chamber . Is it my fuel of what else i dont know .
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Last edited by stemargia on Sun Aug 10, 2008 4:08 pm, edited 2 times in total.

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Unread postAuthor: Hubb » Sun Aug 10, 2008 4:04 pm

First off. Help us. Please try to have better grammar.

As far as your problem. You're probably putting too much fuel in the chamber.
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Unread postAuthor: SpudFarm » Sun Aug 10, 2008 4:12 pm

that is MUCH better.. as others have said - you use to much fuel. try to spray the same amount of fuel in and blow carefully in the chamber afew times before you cap it up.
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Unread postAuthor: stemargia » Sun Aug 10, 2008 4:14 pm

SpudFarm wrote:that is MUCH better.. as others have said - you use to much fuel. try to spray the same amount of fuel in and blow carefully in the chamber afew times before you cap it up.


Is 2 sec enouf for an ignition???
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Unread postAuthor: SpudFarm » Sun Aug 10, 2008 4:30 pm

hmm, depends on you chamber.

what i do on minis (HARD to fuel) is to spray MUUUUUCH hair spray on the chamber walls and everywhere so i get a good liquid layer of hairspray, then you ignite it while cap is of and air out for a minute. then you just put your cap on and wait in like 10seconds and shoot.
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Unread postAuthor: jrrdw » Sun Aug 10, 2008 4:31 pm

Experiment with it, thats part of the fun. 1st try 1 second and see how that works, then 2 seconds ect.....

Let us know how it goes.

As for the rest of you leave the moderating to us moderators!

Welcome to Spudfiles.
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Unread postAuthor: stemargia » Sun Aug 10, 2008 4:38 pm

owkey i will tell it if it worked
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Unread postAuthor: nivekatoz » Sun Aug 10, 2008 6:22 pm

Im no expert on combustions but if it were me I would use propane or starter fluid spray (ETHER) Its more flammable and less sticky.
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Unread postAuthor: Darkside 6ix » Sun Aug 10, 2008 8:26 pm

Hmm, sounds like you are using too much fuel. Try spraying one second less that what you were spraying. So lets say you were spraying 5 seconds of axe. Then try 4 seconds. If that doesnt work try 3 seconds, etc.

Please try and use better grammar. Nobody likes it when someone types ZOOMMFGGG I NEEDZ HELPpP!!!!!! HAXORING MY CANNON WONT WORK PLZ HELP!!!!!! (especially if that someone is a noob) just try and give your post some thought before you actually type it. :roll:
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Unread postAuthor: rp181 » Sun Aug 10, 2008 8:27 pm

try holding the can upside down and spraying, in some, only the aerosol comes out with no product.
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Unread postAuthor: daxspudder » Mon Aug 11, 2008 12:50 am

the real problem is that your depleting the oxygen content of your chamber, meaning there isn't enough O2 to ignite the mixture. Do not spray so much, if you search this site you'll find many more answers to similar problems... and when it comes to ether, i.e. carburetor cleaner, it is EXTREMELY easy to use too much fuel, usually a .5 second spray is more than enough. Use less fuel, and FYI more liquid, despite previous posts, is completely irrelevant. Best of luck to you.
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Unread postAuthor: Necrosis » Mon Aug 11, 2008 7:10 am

How'd he get that WANTED thingy from the classifieds?
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Unread postAuthor: stemargia » Tue Aug 12, 2008 11:57 am

Thanx guys it works perfect SPUDGUN is SOSOSOSOSOSO cool!!
with hairspray i shoot the patato about 200-300 metres
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Unread postAuthor: Ragnarok » Tue Aug 12, 2008 1:00 pm

stemargia wrote:with hairspray i shoot the patato about 200-300 metres

Hmm...

That sounds a rather generous estimate. I suspect you're suffering from ORES (Overgenerous range estimation syndrome), which leads most inexperienced range estimators to think most ranges are usually at least twice as far as they actually are, if not more.

Think more like half those distances and you're probably in the right ballpark.
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Unread postAuthor: ROCK SOLID » Tue Aug 12, 2008 4:54 pm

what is the length of the barrel
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