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QEV air rifle + CO2

Built a pneumatic cannon? Then post it here! This section is for completed, finished cannons that you have built. Please include pictures and information.
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What do you think about it?

Its ok need changes
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Good
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Worst i have ever seen!
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Total votes : 3
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QEV air rifle + CO2

Unread postAuthor: destronx » Wed Aug 17, 2011 7:12 pm

Recently been working on this airgun but when assembling all the parts I found that had an error the air went out from the barrel making kind of a whistle sound when i filll it with air. I first try to fill it with a bike pumo but the air leak So i make a video to show u guys what its like so if you could tell me what would i need to change or fix. That will be very usefull.

Also i wnated to know is, would thuis built work for changing the chamber and puting this http://cgi.ebay.com/Paintball-New-Quick ... 2a0f2d8240

WILL LOVE TO SEE ANY TYPE OF REPLY OR COMMENT!
:) [youtube]http://www.youtube.com/watch?v=0oYzGzV4tdU[/youtube]
[youtube]http://www.youtube.com/watch?v=afEff8mn77E[/youtube]
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Unread postAuthor: mattyzip77 » Wed Aug 17, 2011 7:24 pm

You need to use a compressor, a bike pump will not work. I dont know how much exacly, but you need a certain amount of pressure to get the Q E V to seal!! EDIT Can we see a close up of that q e v????
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Last edited by mattyzip77 on Wed Aug 17, 2011 8:35 pm, edited 2 times in total.
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Unread postAuthor: destronx » Wed Aug 17, 2011 7:25 pm

THANK YOU FOR the help goin to google how much pleasure will it need to seal
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Unread postAuthor: mattyzip77 » Wed Aug 17, 2011 7:31 pm

As far as pleasure goes, i dont know, be nice, but pressure I am not sure, at least 10 to 20 p s i I would guess!! :D
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Unread postAuthor: warhead052 » Wed Aug 17, 2011 8:02 pm

I think I see your problem. You may have a leak in one of the joints, but another problem may be that your schrader valve is leaking and letting the valve pilot.
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Unread postAuthor: destronx » Wed Aug 17, 2011 8:04 pm

what would u recommend to do?
change the valve?
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Unread postAuthor: warhead052 » Wed Aug 17, 2011 8:07 pm

I am assuming you have a bath tub. Fill it with water, and fill the gun up with water and place it in the water. Look for leaks and let us know where. If you have a tripod, video tape it so we can see as well.
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Unread postAuthor: mattyzip77 » Wed Aug 17, 2011 8:27 pm

EDITED Try switching the blowgun part to the other side, it could be backwards!!
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Unread postAuthor: Gippeto » Wed Aug 17, 2011 8:36 pm

warhead052 wrote:I am assuming you have a bath tub. Fill it with water, and fill the gun up with water and place it in the water. Look for leaks and let us know where. If you have a tripod, video tape it so we can see as well.


I trust that you mean "fill the gun with AIR"??? :lol:


I think you should remove the piston from the qev and inspect it and the piece you remove (the seat) for damage.


@ Matty... the blowgun is correctly installed.
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Unread postAuthor: warhead052 » Wed Aug 17, 2011 8:43 pm

Yes, Gippeto, thats what I mean. Sorry. I have had a long day. I suppose filling it with water then filling it with air would also solve the problem. You would find your leak at least.
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Unread postAuthor: daniel0663 » Wed Aug 17, 2011 8:49 pm

Quick exhaust valves should generally seal at pressures between 10-15 psi, as warhead052 has mentioned. You should identify the leaks, then we could possibly identify the problem.
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Unread postAuthor: jor2daje » Thu Aug 18, 2011 12:43 am

I think your pilot is far to big also, even if its not whats causing it, you should cut down the size, you will see a performance increase.
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Unread postAuthor: Crna Legija » Thu Aug 18, 2011 1:48 am

mattyzip77 wrote:You need to use a compressor, a bike pump will not work. I dont know how much exacly, but you need a certain amount of pressure to get the Q E V to seal!! EDIT Can we see a close up of that q e v????


with a real QEV like he has you can fill them with a shock pump you don't need a compressor.

my Qevs seal with lung pressure 2-3psi, i think you have something on the barrel port seal(seat) open it up and give it a clean.
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Unread postAuthor: jor2daje » Thu Aug 18, 2011 4:21 am

Are you sure you have the ports correct? you could be filling from the barrel which would open the qev enter the chamber then out the pilot which you could have set up as the barrel.
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Unread postAuthor: streetfire » Thu Aug 18, 2011 6:46 am

put it in water so you can see where it leaks fix it and try again qev's are really sensitive so no leaks is advised
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