Multishot qev

[Haniball1337]

Ye its me noob, i am wanted to build the simple multishot airsoft gun with qev, And when i was searching youtube i found this and i make something similar to this and like always for me it dont work xD It shoot but it use all air in chamber . What can be the problem? (Slide valve is here beacuse i am lazy and i dont wanna to unscrew it )

[farcticox1]

Swan Donovan has a good multi shot system.

[youtube][/youtube]
[youtube][/youtube]

[wyz2285]

I made that system back when I was a teen
For it to work you need a piston that has spring in the back and allows to be filled from chamber side.
If your QEV is bought un modified, take a 1mm wire and poke a hole in the piston (not in the middle or you get leaks, poke it where the thick rubber meets with the rubber skirt), then add a weak spring behind it. Then it should work.

[farcticox1]

[youtube][/youtube]

[Haniball1337]

Ok thanks a lot guys , i have one more question. Will that work with normal compressor blowgun ? but shrader valve will be on the end of blowgun

[wyz2285]

I came up with a similar design too as my first "semi auto".
The idea is to limit the exhaust volume so the QEV would close. I made a check valve with tiny leaks instead of the shrader so I don't have to manually reset the shrader.
Basically one side of the blowgun connects to the QEV the other side has to have a valve, be it a shrader, ball valve or check valve. You can play with the exhaust volume too for different output power from the QEV

[Haniball1337]

So it will work? and i dont need any spring then?

[wyz2285]

You still need it.

[Haniball1337]

but no hole in piston?

[wyz2285]

You still need the hole too.
The QEV need modification in all cases, except when you're using a 3 way/slide valve setup.

[Haniball1337]

Another question, I want to make hole and add spring but i want too to shoot one shot with this? Will hole and spring deacrese power with one shot? With spring and hole can i fill the chamber from pilot port? or only from chamber port?