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Equilization hole/Coaxial.

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Equilization hole/Coaxial.

Unread postAuthor: Demon » Mon Sep 15, 2008 5:09 pm

I just heard then the coaxial piston needs an equilization hole???

My coaxial is going to be sealed soon and i wanna know if i need an equalization hole or it will work without it?


:scratch:
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Last edited by Demon on Tue Sep 16, 2008 6:14 am, edited 1 time in total.
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Unread postAuthor: frankrede » Mon Sep 15, 2008 5:11 pm

You won't need one in a coaxial, unless your piston is perfectly sealed.
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Re: Equilization hole???Coaxial.

Unread postAuthor: far_cry » Mon Sep 15, 2008 5:15 pm

frankrede wrote:You won't need one in a coaxial, unless your piston is perfectly sealed.

just what he said .if the piston is 100% sealed (O RINGS)


in coaxial ,the piston have to be with spring ????
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Re: Equilization hole???Coaxial.

Unread postAuthor: MrCrowley » Mon Sep 15, 2008 5:39 pm

far_cry wrote:
frankrede wrote:You won't need one in a coaxial, unless your piston is perfectly sealed.

just what he said .if the piston is 100% sealed (O RINGS)


in coaxial ,the piston have to be with spring ????

... :?

Can you please rephrase that with correct grammar because I have no idea what you just said.

Anyway,

In a coaxial or barrel sealing piston, you will not need to make an equalization hole unless the piston is sealed 100% with o-rings.
You may want to add a very, very small one if it takes too long to fill up your cannon because the piston is so tight, but you shouldn't need too.

If you can move your piston inside the piston housing (or chamber in a coaxial) with little resistance, you should be fine. But it is critical that you don't have too big of a gap between the piston and the piston housing (or chamber).
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Unread postAuthor: far_cry » Mon Sep 15, 2008 5:44 pm

the piston valve have to be with spring to puch it on the barell????
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Unread postAuthor: MrCrowley » Mon Sep 15, 2008 5:51 pm

far_cry wrote:the piston valve have to be with spring to puch it on the barell????

No.
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Unread postAuthor: frankrede » Mon Sep 15, 2008 6:31 pm

Not on a coaxial.
Unless you want the piston sealed against the barrel when loading ammo to prevent ammo from getting into your chamber.
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Unread postAuthor: Demon » Tue Sep 16, 2008 6:10 am

If you can move your piston inside the piston housing (or chamber in a coaxial) with little resistance, you should be fine.


If i blow on my piston, he is projected away at aprox. 3 feets.

Is that enough?

(Its a 3 inch piston)
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Unread postAuthor: frankrede » Tue Sep 16, 2008 7:01 am

Demon wrote:
If i blow on my piston, he is projected away at aprox. 3 feets.

Is that enough?



hmmm





errmmm.. well.
Your piston moves 3 feet when blown?[/i]
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Unread postAuthor: psycix » Wed Sep 17, 2008 4:49 pm

Some answers to questions in this thread:
-You wont need a spring if you fill from the pilot.
-Yes, 3 feet would be more then enough... :lol:
-Your piston should move back a little more then 1/4th of the diameter it seals agianst.
For a 2" piston valve with 1"porting, your piston should move somewhere between 1/4th" to 1/2"
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