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Wrinkled ductape on piston

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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Unread postAuthor: jrrdw » Sun Oct 07, 2007 5:57 pm

Is the fill port allways on? Looks like it from the pic. That would stop it from working. My piston did the same basic thing. A sv did the trick for me, and by most member standerds i have a huge pilot chamber.
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Unread postAuthor: noob of noobs » Sun Oct 07, 2007 10:35 pm

Alright, this is going to sound pretty stupid here, but
A) What's the fill port?
B) What's a sv?
Sorry for ignorance, but it didn't show up on the wiki, and I'm a bit unfamiliar with all the technical terms.
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Unread postAuthor: jackssmirkingrevenge » Sun Oct 07, 2007 10:48 pm

A) What's the fill port? - the area where you're feeding compressed air from

B) What's a sv? - schrader valve

What he's saying is that if your air supply is still open, then when you open your pilot valve it won't work. Your pilot volume is a little large with all those reudcters but still, the piston seems a tight enough fir, technically it should be working.
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Unread postAuthor: jrrdw » Mon Oct 08, 2007 6:36 am

jackssmirkingrevenge wrote:A) What's the fill port? - the area where you're feeding compressed air from

B) What's a sv? - schrader valve

What he's saying is that if your air supply is still open, then when you open your pilot valve it won't work. Your pilot volume is a little large with all those reudcters but still, the piston seems a tight enough fir, technically it should be working.


SV= Sprinkler Valve

A shrader valve is a different style fill port.

If your useing a quick disconnent to attach you air supply you can place a brass ball valve inbetween your air hose and cannon, then after you fill close the ball valve and all should work.
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Unread postAuthor: noob of noobs » Mon Oct 08, 2007 8:13 am

I'm using a schrader valve connected to a bike pump to fill it, so I'm pretty sure that means that the fill port is always off. I might try incorporating a sprinkler valve on pilot to try to help preformance, but I'd prefer not to due to money and portabilito problems.
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Unread postAuthor: jrrdw » Mon Oct 08, 2007 1:41 pm

The sv should be in the very rearward possistion, the fill shoud be inbetween the piston and sv. Just incase there was any question about it. I think it will solve your problem.
Question: Why would the sv cause portabilito problems? Use a modded one, you can buy it that way from BcArms, or get your own and mod it yourself.
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Unread postAuthor: noob of noobs » Mon Oct 08, 2007 5:44 pm

A sprinkler valve is a bit bigger than I'd like, but I'll try to use one when I get one. I still don't know why it won't work as it is though...
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Unread postAuthor: jrrdw » Mon Oct 08, 2007 6:38 pm

Pump it up then unscrew the tee the lines are hooked to. Unscrew it fast, put flour down the barrel so you know when/if it fires. If it fires when you unscrew the tee, then your problem was not piloting fast enough, if it don't fire then a sv wont help you. If your piston slides as fast/easy as you say i don't see why it wont fire with a sv. The pressure in the pilot chamber has to be low to fire, i've heard 2 to 3psi i think, so it's best to vent it really fast is key, via a modded sv.
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