Paintball

[pizzaluvr]

I've heard of springing a PGP, which uses old sheridan springs, to use a Nelson spring(>97 Cocker springs). All you would need to do would be drill a hole big enough to fit it, right(with a drill press, obviously)? You would also need a new RVA, wouldn't you?

[B]

Nopethe springis not nearly long enough, the hammer is hardened you will just be wasting drill bits. Sheridan springs are available and can be found in ready to customize lengths at the hardware store.

[pizzaluvr]

Ok, thanks. Glad I didn't do anything with it, then.
I bought an EPGP from someone, and they said it leaked from the 3-way because it required to much pressure to recock. Any fixes to this? There is a small leak. I haven't personally gotten to the chrono yet, but he said he could only get it to around 240. I guess I'll wait till I can get to the chrono to decide on what to do.

[sdlm]

Well, if it is having too much trouble recocking, there are a few things you could do. one is use a larger diameter ram, as a larger diameter develops the same force at a lower pressure.

If that isn't an option you need to reduce the pressure required to compress the spring when cocking. This obviously means a lowering of velocity, however you can offset that. Either by making less pressure needed to open the valve, making the hammer heavier and hit the valve with more momentum, or increase the flow from the valve.

There is another possible option, increase the input pressure higher, assuming you have some regulator on their already you could replace it with a gas-thru and have 850psi behind the valve. At that high of a pressure a PGP doesn't need much of an impact on the valve to get 300fps, and since they are setup for unregged co2 they can handle the pressure.

But, first things first, make sure the 3 way isn't just leaking due to bad o-rings.

[pizzaluvr]

I know it's not leaking due to bad o-rings, because when I turn the LPR down, it doesn't leak at all. It has a reg on it, and it is currently around 450 PSI IIRC(don't have it with me). Raising the pressure is a good idea, I think I'll go that route.

[Jordan]

Unless there's been a lot of work done to it, you're going to need at least 800 psi into the valve, as they're not meant for anything less than that.

Most Strokers need at least 600 psi, and they've been worked over by PPS.

Try upping the pressure into the valve.

Jordan

[pizzaluvr]

Yeah, it has 800 PSI in it(a little over), and there is still a small leak. This is with the RVA about 1.5 turns from flush.

[Jordan]

Probably needs new o-rings in the 3-way.

When you turn the LPR down, are you shutting it right off? That would explain the leak disappearing. . .

Most 3-way leaks are caused by bad o-rings, not enough pressure, or lack of lubrication. Some of the aftermarket 3-ways, like the Bomb, are very sensitive to input pressure - they need a slightly higher pressure to seal up, as the o-rings need to deform from the pressure to seal.

Jordan

[pizzaluvr]

I'm not that stupid... It will still cycle fine, but it won't go far enough to cock it back. I don't think a SF frame 3 way has any o-rings to replace... Just a solenoid, which I doubt would be the problem.

[Al Ray]

Well on the subject of springing a sheridan with nelson springs, yes its possible, sort of. One of my longe term projects has been to build a sheidan that uses Nelson springs. I decided to use an autocoker hammer and dwell adjustment/rva. Basicly I turned down som barrel stock to fit inside of the bottom tube for about an inch. Thats basicly as far as it got, since the project was/is 100% scratch built, and winchester/henery rifle looking. Basicly what put a wrench in th whole thing was to lever linkage, as I wanted to keep the whole body of the gun at 1" wide. so to put it simply I had to sit back down and redraft a whole new idea as my first one didnt work. So thats where it stands, some tubing, some big chunks of brass, a lever and some AC parts. Now I would assume that if you found some thin walled .685 ID tube, you could just sleve a sheridan to accept Autococker hammers.