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properly expand propane into gas.

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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properly expand propane into gas.

Unread postAuthor: adem70 » Tue Aug 24, 2010 11:38 pm

Alright guys I have another question for you. I started running my bbmg on 1pound propane tanks a while back, but the problem is that the propane expands when it hits my guns chamber, causing everything to ice up, and jam. I bought a co2 expansion chamber online, but it does not seem to help.
i have it all setup on a remote-line rig, and i dont understand how a 5 foot hose, and an expansion chamber are not enough for the liquid propane to expand. If anybody knows any tricks that'd be great. thanks.
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Unread postAuthor: Crna Legija » Tue Aug 24, 2010 11:57 pm

are you sure liquid propane isn't getting into the hose/gun
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Unread postAuthor: jhalek90 » Wed Aug 25, 2010 12:04 am

i simply solved the same problem like this:

propane cylinder>ball valve>expansion chamber (1'' steel pipe nipple.)> main firing valve (blow gun)> vortex block.

This design has 2 effects.

if you open the ball valve, wait a second and the close it before shooting, you get a 20-40 round burst.

If you leave the ball valve open, usually only part way, you get full auto.
This approach causes a "Over cooling" of the gun after a few seconds.... over cooling takes a lot longer than if you had no expansion chamber.
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Unread postAuthor: adem70 » Wed Aug 25, 2010 3:17 pm

liquid propane is getting into the gun, thats my whole issue. jhalek, thats almost identical to the setup im using, i just dont have the valve. the reason liquid propane is getting into the gun is because i have the tanks upside down, because when upright they only get about 60 psi, and that barely makes my gun shoot properly.
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