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Help butane pronlems

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Help butane pronlems

Unread postAuthor: mark0491 » Sat Jul 07, 2007 2:01 pm

Hey i just hooked up a BBQ lighter butane attachment up to the office gun of destruction and every time i fill my chamber with butane and try the peizo igniter (also salvaged) i cant get it to fire. When i fill my chamber the piezo stops working, although when theres nothing in the chamber i have a steady works everytime spark ........ help me. PLZ :kermit: even Kermit wants an answer.
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Unread postAuthor: SnowFlox » Sat Jul 07, 2007 2:35 pm

maybe you got tomuch fuel in it..

and maybe its to wet inside. I had this problem to, because the cucumbers.
There make my whole chamber wet, so there where no sparks..
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Unread postAuthor: mark0491 » Sat Jul 07, 2007 2:46 pm

cucumber???????????????????????// and its wicked
dry in my chamber
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Unread postAuthor: mark0491 » Sat Jul 07, 2007 4:01 pm

Any more solutions other then the cucumber is wet?
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Unread postAuthor: Jumpin Jehosaphat » Sat Jul 07, 2007 4:21 pm

You are probably putting too much butane in your chamber for ignition. Combustion requires a lot of air, try putting less butane in your chamber and venting in between shots.
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Unread postAuthor: jimmy101 » Mon Jul 09, 2007 8:33 am

1. Try a smaller spark gap. The breakdown voltage of air changes a bit when there is butane or propane present. You really only need the tinyest of spark gaps, a bigger gap does nothing for the gun's performance and is more likely to work sometimes and fail other times.

2. The generic answer for a combustion not firing is too much fuel in chamber. The combustion range for butane in air is ~1.9-8.4% by volume. If you are outside the combustion range then the fuel won't ignite regardless of how big your spark is.

3. Got a chamber fan?
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Unread postAuthor: SnowFlox » Mon Jul 09, 2007 10:15 am

mark0491 wrote:cucumber???????????????????????// and its wicked
dry in my chamber


yeah you know... this green dildo thingy you can eat ;)

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ill stick it with to much fuel :)
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Unread postAuthor: f.c » Tue Jul 10, 2007 3:39 am

my suggestion is scrap the butane go for propane. butane has a tendency to be fiddly in minis. or use mentholated spirits.
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Unread postAuthor: psycix » Tue Jul 10, 2007 7:09 am

Try venting it for an hour, and then put VERY LITTLE fuel in.
I think you got too much fuel.

A rule of thumb is that when a combustion doesnt fire coz of fuel problems, you got too much fuel, never too less.

I dont know how small your chamber is but on mini guns it can also be useful to spray little fuel in, dont close the cap yet, wave it 5 times forth and back to let a part of the fuel out and some air in. And then close the cap and fire.
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