Brian the brain wrote:Guessing??
Of course a bigger volume needs more pumps to reach the same pressure!
Of course, of course...
but maybe 
What I mean was, while the valve should be better, it should not be expected that the same number of pumps should give more power.
What's the max amount of pumps you have tried?
Reached the limit yet?
25 so far, it really does get tedious
in fact I'm thinking of adding a delrin tube to reduce the volume, after all we know that for the same amount of air, moar pressure and less volume means moar power.
As to the limit, let's look at how the valve compares with the original.
The area available for the pressure to keep the valve shut is 36% that of the original, so technically you can go 3 times as high before the hammer is ineffective. Also, the return spring is much weaker, to the extent that you need to cock the hammer in order to fill.
With the current setup I reckon I can go to at least 50 pumps and still have full chamber dump.
The real gain from using a balanced valve would be the larger flow.
This should enable you to use a bigger caliber without losing performance like you would get if you'd use the stock valve.
Don't forget that there is a 3.4mm hole in the barrel which I haven't touched, so it has significantly more potential...
I'm feeling a weird mix of envy and pride...that valve is my baby you know...I wish I could have had a chance to try it in a Crosman variant myself...although I'd lean towards the CO2 versions.
And no...it won't freeze up.
I believe there are a couple of young machinists in your area, I'd be happy to supply drawings
though converting a 2240 valve would be a challenge because of the requirement to pierce the CO2 capsule.
Results seem promising, I, like BtB, think its well suited to a big bore barrel. Probably work very well with a 24 inch barrel in .22 from crosman as well.
That would certainly take advantage of the bigger chamber.
The big difference I'm assuming will be how many pumps the valve will dump before retaining air, that's why the stock valve is only recommended for 10 pumps, because it starts holding air much past that, and actually reduces performance. With this valve I'm expecting it to be able to dump a lot more air!
Yup, see above.
Probably impractical to pump 50 times each shot, but I imagine performance would be nice! Was it getting hard to pump at 25?
Not particularly hard but too much pumping gets boring, I will probably find a way to reduce the chamber volume.
And what was the report like compared to stock?
It's pretty, pretty loud.
PeteS wrote:Yeah, my unmodified one gets 450 fps on 10 pumps. It has since had steel receiver, nicer sights, and trigger makeover, but no changes that should improve muzzle velocity.
Power isn't everything, it certainly is a design that scrubs up nicely even if you leave it performing stock
