Show us your pneumatic spud gun! Discuss pneumatic (compressed gas) powered potato guns and related accessories. Valve types, actuation, pipe, materials, fittings, compressors, safety, gas choices, and more.
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.
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????
Last edited by mattyzip77 on Wed Aug 17, 2011 8:35 pm, edited 2 times in total.
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.
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.
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"???
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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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.
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.
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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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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