Valve Mods

[gurnster75]

Well guys just modded my first valve. I took a couple of the male threads off, ground down part of the valve stem, give the internal surfaces a polish and the most tricky bit I found was angling the exhaust port. I used a dremel and by the time I was finished I'd made the exhaust port slightly bigger, it wasn't planned but I don't suppose it will be a bad thing. Just wondering is it worth sticking a lighter spring in it while it's apart?

[DJammer]

Depends on what your final goal is..
Is this for a 13xx or a 22xx?
More info needed

[1377x]

it wouldnt hurt to!

[quickster47 †]

Have to agree with what DJammer wrote.

What type of gun valve are you working on and what exactly are your goals for this gun?

Carl

[gurnster75]

It's going in a 22XX with standard length 2240 .22 barrel, but it's got a 2250 tube fitted with stock. So I can go over 6ft/lbs, wanting max power for the barrel length, not too bothered about shot count. 

[1377x]

i had my 2250b set up like that at first
now its full sized and sold

[quickster47 †]

It's going in a 22XX with standard length 2240 .22 barrel, but it's got a 2250 tube fitted with stock. So I can go over 6ft/lbs, wanting max power for the barrel length, not too bothered about shot count.

I just opened up a brand new 2240 this past week, cleaned the barrel and got these numbers after shooting 100 JSB Diabolo Exact Jumbo Express pellets weighing 14.3 grains, average = 415.5 FPS and 5.5 FPE.   So your goal of getting over 6 FPE should be doable but it might be tough with that 7.5" barrel.

Have you run some lead over a chrony since your valve mods to see how the gun is shooting now?

Carl

[gurnster75]

The gun and the valve for that matter are still in bits at minute, I've got enough parts for 1 1/2 projects at the minute, so I'm waiting to get the missing parts before I decide fully whats going on what. Should end up with 2250 with 2240 barrel and M4 stock, and a .177 14" barrelled 2250 with a walnut stock.