you can use my design if you want:


the only problem I had was fuel injection while still looking and feeling "natural"

inonickname wrote:Rather than doing a massive number of tests, you could just use a meter then measure the volume of the chamber.

that would b faster haha. but wouldnt there b a certain ratio of air:fuel i would need to test?

Well, seen as your having the barrel smaller that's the point. You can run the 1" chamber the whole length of the gun, then run the 1/2" barrel most of the way through- so you get a slightly larger chamber, and it's the same size the whole way through. It'll take more work to mix the fuel well and ...

If you're using a larger chamber than barrel now, why not make a co-axial? That will give a larger chamber volume and keep the gun smooth (and all the same size)

Lol okay sorry, I looked up "coaxial" in the wiki and google and I still don't know what that means. All I understand is that the ...

Sorry I couldn't reply fast enough, it's like my internet was having a seizure....

Anyways, after reading over the several links proposed, I've made some revisions.

jackssmirkingrevenge: I will look into your hybrid suggestion. Kind of like a turbo I suppose? where you fill a cylinder with as much ...

Welcome to the forum.

Just a small point, having such a tiny chamber with a combustion at atmospheric pressure the power is going to be rather miserable. Some cartridge research you might want to look into :)

Thanks for the input and link. Yeah I realized that my chamber is an insect compared to ...

Hi there spudders, I'd like to introduce myself to the forum.

My name is Pactin.......and I have no experience in spud guns haha. However, I have drawn out plans several times after being intrigued by the fun factor.

I have a bit of physics knowledge which I hope would help me with my future ...