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Valve Mods

Started by gurnster75, October 09, 2011, 10:47:16 PM

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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?
TX200.
Custom Ratty (Work in progress).

DJammer

Depends on what your final goal is..
Is this for a 13xx or a 22xx?
More info needed
A gun in the hand is better than a cop on the phone 
ΜΟΛΩΝ ΛΑΒΕ!

1377x

closed mouths dont get fed

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

I've never wanted something so useless in my life.
In Omnia Paratus
1947-05-19 - 2016-07-14 †

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. 
TX200.
Custom Ratty (Work in progress).

1377x

i had my 2250b set up like that at first
now its full sized and sold
closed mouths dont get fed

quickster47 †

Quote from: gurnster75 on October 10, 2011, 11:21:23 PM
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

I've never wanted something so useless in my life.
In Omnia Paratus
1947-05-19 - 2016-07-14 †

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. 
TX200.
Custom Ratty (Work in progress).