Most people are trying to add another QEV to their guns, but I've decided to
go the opposite direction. I replaced the QEV on the rear of the Ego7 ram with a
banjo that is identical to the one on the front of the ram. Here is a picture
showing that the banjo bolt actually has a slightly larger diameter through
the screw than the QEV:
Of course, even with this slightly larger diameter screw the air still has to
travel through a much greater distance before venting (all the way through
the LP hose to the noid instead of directly out the QEV). This will
decrease the max cycle rate. But the good news is that the
Ego7 can cycle soooo fast in the stock setup, that the change is
unnoticeable. It will still cycle faster than any loader will feed.
With is all hosed up and ready to go it looks like you would expect:
With this longer air travel distance and slightly slower venting this provides a
similar "air cushion" effect as the zick kit. This will result in a minimally
"smoother" shot than stock. With the zick kit this would be accentuated
In real life use the change is all all but un-noticeable. I doubt anyone would
be able to pick out the gun with this mod over any other stock Ego7 just by
shooting it. The main benefit, and the reason I chose to do this, is because
it adds another level of reliability. The one part (if any) that seems to fail on
Ego7's seems to be the QEV diaphragm. With the banjo in place it
completely avoids the possibility of that failure mode.
Time to Install: 10 min or less
Cost of Parts: Minimal
Decrease in ROF: None in "Real-World" Use
Change in Shooting: Un-noticeable
Never Having a QEV Diaphragm Fail: Priceless
Just a thought for anyone who would rather have a gun that never breaks
instead of one that can cycle 50 times per second.
Originally Posted by Jack Wood
No real issue with doing this. The 07/08 is still considerably faster acting than an Etek or Timmy solenoid, so no it doesn't make it feel like an Etek.
As the QEV is only on the rear stroke of the 07, then all that the QEV does is help increase rearward speed of the rammer, and does not influence the forward (critical speed) of the rammer.
I think Xluben has hit all the advantages and disadvantages on the head as far as this mod is concerned.