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Problems w/ Onboard Fuel Injection

Discuss miniature cannons built from things such as pill bottles and pen caps.
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Problems w/ Onboard Fuel Injection

Unread postAuthor: Tsukiten » Sat Nov 17, 2007 5:30 am

Hey guys,
I started yesterday building some reliable mini, And I finally did that by using a onboard-fuel injection... But I found that the chamber was to weak, too fat and there were some big rips where the barrel goes in. So I decided to scrap the fat chamber and go for a thick walled, thin long chamber with no holes (some gluestick containter).
Here's the result:
Image

But since I'm using that chamber...It doesn't fire at all!! :evil: :evil: :evil:
I just can't get that mix right :cry: It's true that I sometimes ajust the wheel that adjusts the butane flow but I returned it in it's original position I think, here's a pic of the fuel injection:
Image

Maybe the insides got something to do with it? :
Image

The cap where the piezo igniter is fixed on uses 2 nails that kinda 'float' above eachother, and are not next to eachother, does this matter? And since the whole chamber is from a gluestick, I can still smell the glue...does that change the athmosphere(?) or something? Here's another pic:
Image

Oh and here's a size comparsion(?) of the 2 chambers...:
Image

Would really appreciate help :( I really wanna fire this thing off again (I miss smashing light bulbs with bb's... :) )
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Unread postAuthor: wangpushups » Sat Nov 17, 2007 5:35 am

Did you measure the chamber volume?
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Unread postAuthor: Hubb » Sat Nov 17, 2007 5:37 am

On my mini (which is bigger than yours :oops: ), I had the same trouble to begin with and here's how I fixed it.

First, I put the butane wheel to a suitable place and left it alone. Next, I just experimented, by seconds, the amount of butane needed. Mine (which was made from a small Gatorade bottle) holds a bout 7 seconds of butane, at about medium power (that's the wheel).

Since mine is larger, I would assume that yours would take less. Also, take a look at this thread. It may help as well.
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Unread postAuthor: Tsukiten » Sat Nov 17, 2007 5:38 am

wangpushups wrote:Did you measure the chamber volume?

Uhm... That is ((radius*2)*Pi)*hight ?? Forgot :(
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Unread postAuthor: Hubb » Sat Nov 17, 2007 5:39 am

pi * radius * radius * length
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Unread postAuthor: Tsukiten » Sat Nov 17, 2007 5:46 am

hubb017 wrote:pi * radius * radius * length

Okay thanks

Old chamber: pi*1.5cm*1.5cm*5cm = about 35.3 square cm
New chamber: pi*1cm*1cm*8cm = about 25.1 square cm

Sure that's the formula? 0.o
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Unread postAuthor: wangpushups » Sat Nov 17, 2007 5:48 am

No man the easiest and most accurate way to check your chamber volume is to fill it with water then measure it in millimeters. Then we could probably go from there...
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Unread postAuthor: Tsukiten » Sat Nov 17, 2007 5:59 am

wangpushups wrote:No man the easiest and most accurate way to check your chamber volume is to fill it with water then measure it in millimeters. Then we could probably go from there...

Isn't the formula enough or do you really want to know the water capacity?

Lol I just tought of fixing the big chamber ON the smaller one making 1 big badass strong mini AND whiping out the problem perhaps?? Plz reply :)
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Unread postAuthor: Hubb » Sat Nov 17, 2007 6:07 am

Did you miss my first post in this thread?
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Unread postAuthor: Tsukiten » Sat Nov 17, 2007 6:15 am

hubb017 wrote:Did you miss my first post in this thread?

Well not really but I gave up on experimenting because I spent ALOT of time with experimenting with clicks, seconds...It just doesn't seem to work with this chamber! :evil:
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Unread postAuthor: jrrdw » Sat Nov 17, 2007 6:36 am

It could very well be a fume problem from the glue, sometimes i get lawnmowers were people get dumb stuff in the gas tank and they just wont fire the mixture until the system gets cleaned out. Sometimes less is more, meaning at least the smaller amount of fuel should fire even if it's a weak shot, untill it gets just rite, also meaning to much will dround the ignition, causing your problem, maby. Don't give up man, keep experimenting and good luck!

Edit: After a closer look at your eletrodes/nails, the points should be even. Sometimes a arc has a hard time crossing to a flat surface, the side of the nail, instead of the point.
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Last edited by jrrdw on Sat Nov 17, 2007 7:01 am, edited 1 time in total.
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Unread postAuthor: Novacastrian » Sat Nov 17, 2007 6:43 am

For a chamber that size you only need like 3cc of butane.
Use a syringe.
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Unread postAuthor: Tsukiten » Sat Nov 17, 2007 7:03 am

Novacastrian wrote:For a chamber that size you only need like 3cc of butane.
Use a syringe.

Thanks for the idea, but sorry... :D I rather work with a butane lighter injection. Number 1 reason is that you don't have to mess with opening the gun, using things like spray's and syringes... And I also think it's alot quicker to prepare for the next shot. Actually the concept of this gun was to use it in a classroom, and I rather get busted with a mini spudgun, than getting busted with a mini spudgun, a propane torch, and a syringe :D
I guess I'll continue experimenting..
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Unread postAuthor: jackssmirkingrevenge » Sat Nov 17, 2007 7:06 am

Tsukiten wrote:Actually the concept of this gun was to use it in a classroom, and I rather get busted with a mini spudgun, than getting busted with a mini spudgun, a propane torch, and a syringe :D
I guess I'll continue experimenting..


I would really advise against using spudguns in the classroom, mini or not, except for officially sanctioned projects.
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Unread postAuthor: wangpushups » Sat Nov 17, 2007 7:08 am

Oh my god dude you just made my day!!! :lol: In the classroom... How old are you?
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