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Posted: Fri Aug 22, 2008 3:34 pm
by skyjive
Thanks for all the responses guys, I appreciate the help. I guess I'll either try a QEV pilot or a modded blowgun.
Posted: Fri Aug 22, 2008 3:39 pm
by potatoflinger
skyjive wrote:Thanks for all the responses guys, I appreciate the help. I think I'm gonna try using a 1/4" QEV/blowgun as a pilot for the 3/4" QEV and see if that works (which it should, if results are proportional to cost and effort)
They are,
this cannon that I made uses a blowgun to pilot a 3/4" QEV, and it has wonderful performance.
Posted: Fri Aug 22, 2008 5:12 pm
by grumpy
ramses wrote:You can't fill from the chamber with a qev.
actualy you can and it is very easy to, all you do is take the diaghram or piston out of the qev and make a very small hole to pilot side. somewhere around here is a thread about it.
Posted: Fri Aug 22, 2008 5:45 pm
by potatoflinger
grumpy wrote:ramses wrote:You can't fill from the chamber with a qev.
actualy you can and it is very easy to, all you do is take the diaghram or piston out of the qev and make a very small hole to pilot side. somewhere around here is a thread about it.
But that would also decrease performance a little bit by slowing down the opening time.
Posted: Sat Aug 23, 2008 5:12 pm
by skyjive
Alright, so my trouble apparently stemmed from a classic noob error, I forgot to unscrew the nozzle on the blowgun that reduces flow diameter to a pinhole. This combined with a redesign of the pilot/fill setup to reduce pilot volume resulted in success, finally. I did a controlled experiment using two identical guns, one with a sprinkler valve and one with a 3/4" QEV with blowgun pilot. The QEV shot roughly twice as far at 70 psi.