QEV gun questions

[Benthehuter]

I am thinking of making a copper QEV gun and I was wondering what the ratio of the volume of the chamber to the volume of the barrel should be.

another thing I was wondering was if there is any rifled barrels around .30 caliber for fifty dollars or less.

[POLAND_SPUD]

1. the ratio depends on the pressure you are planning to use.... the higher the pressure the smaller the chamber V can be....

of course the bigger the chamber the more power you'll get but a rule of diminishing returns (or something like that) applies here so you won't get much power increase above a certain ratio...

what is more, there are certain advantages of using smaller chamber V: =pumping the gun will take less time
=the gun will be more quiet


I advise you to download GGDT ( http://www.spudfiles.com/spud_wiki/index.php/GGDT ) and thinker with it to find the ratio that suits your design best.

[sniper hero]

why not rifle the barrel yourself
it isn't that difficult
and with a 100 ml chamber you need at least 8-10 bars for good power
about half a litre will be fine
if you have a compressor a bit more would be better

[Bando_Red]

I don't mean to revive a dead topic,but I'm in a similar situation with an extra problem.I'm not so great at ratios,so I don't know what the hell kind of QEV to get.All I know is the ammo I'll be using is .177 pellets.

[FordGtMan]

Bando, you wont be needing anything larger than a 1/4" QEV for .177. anything larger will just be a waste.

[Baldwin1993]

hey dudes..
any1 know how to make a qev??
HELP lol

[sinper2006]

have a read of these.
http://www.spudfiles.com/spud_wiki/inde ... ston_valve
http://www.spudfiles.com/forums/piston- ... t8157.html

[Baldwin1993]

yeah thnx mate.. i know hpw they work but i need some instructions on how to make them bra

[sinper2006]

Try looking in the how-to section of the forums
http://www.spudfiles.com/forums/how-to- ... s-f11.html
or using the search
http://www.spudfiles.com/forums/search.html
and if you can't find it on them links try here
http://www.instructables.com/id/Golfbal ... That-Shoo/

[Baldwin1993]

thnx mate
didnt find it but ill just use a sprinkler valve

[fan4tics]

hi all

thnx mate
didnt find it but ill just use a sprinkler valve

yeah... only sprinkler valve mod.

i did found some instructions at You Tube (links below) but all in French..










could anybody translate it to english... please

:newb:

[SEAKING9006]

There are better instructions here. Use the search function, the how-to section, or the Wiki.

For some reason, I'm beginning to think the search button is broken today.....