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3/4in QEV gun

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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3/4in QEV gun

Unread postAuthor: jim_himself » Wed Sep 22, 2010 10:06 pm

At the moment, I am building my first QEV gun. My current setup is a 3/4in QEV with a 6in long 3/4 chamber and a 1/4in ball valve pilot. I hope to run it at 300psi+ once i get my shock pump. I still haven't decided on a barrel size. Any tips to make it more efficient or input on what barrel would be the best is appreciated
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Unread postAuthor: BeaverRat » Wed Sep 22, 2010 11:05 pm

I am almost positive that it will take decades to pump up that size chamber with a shock pump...
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Unread postAuthor: jim_himself » Thu Sep 23, 2010 6:28 am

Im not so sure...it takes five pumps with a bike pump to get it to 120psi im guess it will ta ke about thirty pumps
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Unread postAuthor: jackssmirkingrevenge » Thu Sep 23, 2010 6:37 am

I have to agree with BeaverRat, I find anything over 1 cubic inch becomes a bit of a chore with a shock pump, and you have almost 3 cubic inches there.

As to the barrel, calibre depends on what you want to shoot (BBs/marbles/anything in between) and in terms of power and efficiency, the longer the better (assuming barrel volume doesn't exceed volume of air in the chamber at atmospheric pressure)
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Unread postAuthor: lozz08 » Thu Sep 23, 2010 6:57 am

about ten minutes straight with your average shockie to fire one shot. Get a floor bike pump instead. Many will go 200 psi+ and take a minute to pump up that chamber.
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Unread postAuthor: jim_himself » Thu Sep 23, 2010 1:58 pm

Okay thanks for the input :P im probably gonna go with a .5in barell then i can use marbles and ball bearings
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Unread postAuthor: Gun Freak » Thu Sep 23, 2010 4:30 pm

Here is a high volume and high pressure pump that can push 300 psi.
And here is a smaller volume and cheaper pump that isn't a three stager but for your volume it would suit your needs.
As for barrel size, choose one in which the ammo can be of a constant size and that is cheap and plentiful. Airsoft bb's are a good example however I think you'd want to go with a larger calliber in this case.
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Unread postAuthor: jim_himself » Thu Sep 23, 2010 7:35 pm

I went with a half inch barrel, i used ball bearings i have from some magnetix kits i got a garage sale, i have about 1000 of them now. To fill it i use my friends air compressor and can get 200psi, performance is good, plenty of power but only so-so accuracy because of the smooth bore.
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Unread postAuthor: Crna Legija » Fri Sep 24, 2010 12:58 am

Get a fridge compressor and you can get 500+psi with the flick of a switch, iv had myn too 800psi, someone took his passed 1000psi :twisted:
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Unread postAuthor: jim_himself » Fri Sep 24, 2010 2:10 pm

Where can one obtain a fridge compressor. I dont have a spare fridge at the moment.
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Unread postAuthor: Gun Freak » Fri Sep 24, 2010 4:53 pm

Ahh yes I used those bearings before in a half inch barrel for this gun. They are a little loose but they work.
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Unread postAuthor: Crna Legija » Sat Sep 25, 2010 4:33 am

jim_himself wrote:Where can one obtain a fridge compressor. I dont have a spare fridge at the moment.


you don't, i always keep one in the corner just in case :lol:, try a junk yard or look around streets people always throw away old ones.
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Unread postAuthor: jim_himself » Sat Sep 25, 2010 9:10 am

Well il start the hunt in my local junkyard. :lol:
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Unread postAuthor: Crna Legija » Sat Sep 25, 2010 10:31 am

i got 3 from a junkyard just in case one didn't work and it only cost the entrance fee, i had to cut it out my self not hard but its illegal to release the freon in side them, something about the ozone
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