To be serious Bob. What your missing is that I am trying and your not. I like the "it ain't gonna work" thing but jezz, come on. Put some of your experience into it. Damnnn.MJP,Thank you for for the push and bread crumbs.I have learned alot lately doing this (money work and play time work).V2 was made today but darn, I really need a mill. Please keep in mind, that a marauder tube or any crosman tube has a double o ring gauge port right before the valve on the HPA side for venting to atmosphere.Not only that, I don't see an SS valve venting to atmosphere and yet people claim it reduces cocking cracking force. Tell me how that works ?To me, I can buy a cothran valve, Cobra valve, or SS valve but, it's just like you guys said, it's how big you can open the valve and still crack it open. I'd rather figure how out to do that instead of buying and possibly change a few things.Please feed the ideas. This seems to be my only hobby besides work and family.V2 is now enclosed in the valve body and uses the valve cap as a retainer.
No metal turning this weekend but alot of thought. You guys are right, there's just now way around not venting. It's just what's the easiest way to vent.I think I have V8 that vents through poppet and added a secondary piston rod that rides in the center of the main piston. I would think that the inside piston uses the HPA to close the valve and possibly allow the valve to generate a bell curve.That small piston/shaft would be way too hard for me to manufacture so I found these RC shock shafts with o rings (3mm/.118" diameter).I am also looking at the bulldog valve housing and poppet to use as an insert in the mrod valve body. Not sure if I can get it to fit, but it sure would be nice. Still trying to get dimensions on it.
After “ tuning “ a BT65 in .25 cal to way beyond what it was designed for (140+ FPE) and the parts started failing . I knew making big power from a relatively tame platform was a poor choice , this lead me to the Winchester project. I believe that having a pressure loss behind the projectile is the reason for the lack of “theoretical maximum “ achievements . With an infinite supply of air that remains at the same pressure from start to end of the barrel will gain the biggest FPE , kinda like why helium makes the power it does . I’ll be trying Marcos overporting technique on another project in .177 cal . Still looking for a few parts before that gets on the bench . Thinking a 24” barrel behind a Cothran valve with .25 porting . Come to think of it I already have all the parts , I got to go .....