FAO those running regulators.
I received my 24″ the other day and I’ve only managed a quick plinking session (and a very quick hunting trip 😉 ) and accuracy seems much improved. However consistency Isn’t.
With my 12″ barrel I was getting around 3 FPS variation which I thought was pritty sweet. Now I’m getting around 11-13 FPS variation. I have tried with hardy any preload on the main spring and adjusted the valve spring retainer for best power and I got 13 FPS variation. I then took out the small spacer and added my biggest one and I got 11 FPS variation with an increase In power of around 1-3 FPS. Obviously I had to put more preload on the valve mainspring as It was tank dumping. I don’t know how much this variation will affect accuracy down range but If I can keep everything as tight as possible that has to help.
After that I’m thinking the least mainspring tension the better right as It’s less recoil and should make the gun smoother and less pressure on the trigger? I would still like more power – Even If It’s a few more FPE – But the only way I can see this happening Is a larger regulated air resevoir or a bigger bored valve stem (or of course an aftermarket valve, Blod or Lang). I think my bore Is 3.5mm now but would an extra .1 of a mm give me the extra FPE? I don’t want to go too big incase the stem collapses but combined with the light spring preload I should get away with It…?
What about enlarging just the top hat bore so the air can escape from the stem quicker? I’m using a 1 piece custom stem and tophat so there’s plenty of metal surrounding the TH.
Your thoughts?
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Whats your max fpe now fusion??
I suspect Lang is right and you have reached the limits of a modded stock valve…
Time to get a stupidly powerful valve…… 😯 😉 😆 (and hammer/spring.) Much more fun having to tune a rifle DOWN rather than having to try to squeeze more out of it 😀
You’re already on the limit of what your components can handle. You need a proper hi-power valve, spring and hammer.
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My spring Is a slightly uprated one. I wouldn’t say It’s mega powerfull but It’s a basic one off Drum to replace the stock spring. Hammer is aprrox 65g. I’m not after mega power, just something for all occasions 😉 I’ve dropped Lang a PM to see If I can lend one of his valves If he has one spare. I know he told me they work differently to the airforce range so I may be able to get better results that way and then changing my main spring preload will have some effect without tank dumps 😆
If I was running off the regulator I would be fine and be able to get crazy power but once the regulated chamber Is empty there Is no air pressure closing the valve back up for a milli second or so which Is causing the tank dumps I’d guess – where as the stock tank you have 200 or so bar helping close the valve back up.