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Homemade QEV

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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Re: Homemade QEV

Unread postAuthor: andrew67 » Thu Nov 07, 2013 7:00 am

Just tested it! I pull the trigger on the blow gun the air vents out the blow gun so I guess the piston isn't releasing off the barrel! Is it possible the piston isn't long enough not going deep enough in the chamber behind it?
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Re: Homemade QEV

Unread postAuthor: jrrdw » Thu Nov 07, 2013 7:25 am

Take the chamber off and reach through the bottom of the tee and move the piston by hand, see what's happening that way.
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Re: Homemade QEV

Unread postAuthor: Labtecpower » Thu Nov 07, 2013 7:25 am

If you're filling the gun from the pilot area, you don't even need a spring :)

If the piston doesn't move back the piston probably isn't tight enough. Clean it very well, and give it a tight wrap of cellophane tape until it fits snug in the housing.
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Re: Homemade QEV

Unread postAuthor: andrew67 » Thu Nov 07, 2013 7:52 am

Movement is fine,I can put a rod down the barrel and push the piston that way,it moves freely but if your saying/labtecpower to wrap the piston to seal it better that means mine isn't long enough because it doesn't seal at all,so I guess it should fit like a coaxial piston would with same concept! I think I'm understanding it better now!you build it the same as you would a coax!
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Re: Homemade QEV

Unread postAuthor: andrew67 » Sat Nov 09, 2013 9:29 am

First test the QEV released all it's air out the pilot valve so I've made a new longer piston,it works fine now,but the whole setup seems to waste a lot of air or it's the blow gun wasting it!hopefully with some tuning it'll be better for multi shots!
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Re: Homemade QEV

Unread postAuthor: jackssmirkingrevenge » Sat Nov 09, 2013 9:30 am

It seems your piston isn't tight enough...
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Re: Homemade QEV

Unread postAuthor: andrew67 » Sat Nov 09, 2013 9:59 am

I don't think I could get it any tighter!but I'll try a new one!see how it goes!
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Re: Homemade QEV

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Re: Homemade QEV

Unread postAuthor: jackssmirkingrevenge » Sat Nov 09, 2013 10:15 am

typically if all the air is going out through the pilot, too much air can get past the piston.
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Re: Homemade QEV

Unread postAuthor: andrew67 » Sat Nov 09, 2013 10:35 am

Ok,no worries I'm understanding better as I go with your help!i think I was a bit miss guided at the beginning! Thankyou!or I missunderstood a tutorial
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