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Old 05-06-2010, 07:35 PM   #1 (permalink)
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Upgraded on/off for a classic valve

Which upgrade on/off can I use in my classic valve? I seem to remember its the R/T on/off. The ULE on/off can be used, but requires modification.

Do I have this right?

Thanks!
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Old 05-06-2010, 08:06 PM   #2 (permalink)
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Yep, that's correct.
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Old 05-06-2010, 08:18 PM   #3 (permalink)
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Awesome thanks.

I'm looking at this one from Tunamart

It says it has a .750 pin, is that one compatible with the classic valve?
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Old 05-07-2010, 09:59 AM   #4 (permalink)
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Old 05-07-2010, 10:10 AM   #5 (permalink)
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On/Off Pin - X-Valve/Retro/Emag/RT

I never realized they had so many different sized pins. .750 is correct.
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Old 05-07-2010, 10:25 AM   #6 (permalink)
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Quote:
Originally Posted by minimag03 View Post
On/Off Pin - X-Valve/Retro/Emag/RT

I never realized they had so many different sized pins. .750 is correct.
0.750 is the standard length, and it is where you should always start.

Since you are often trying to shoot faster with the RT on/off upgrade, you might find some shootdown that you didn't notice before. If your valve and reg holes are lined up and you get shootdown with the RT on/off, you can usually go down to 0.72x safely and get a lot of improvement.

If you can afford the extra pins, they make testing easy.
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Old 05-07-2010, 11:07 AM   #7 (permalink)
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That's great info, and an excellent link.

I've never experienced shoot down before, how will I know if I am getting shoot down? Will one of the 8-hole reg bodies stop that? I have one, but I'm not really wanting to use it since it's purple.

So what's the best way to tune the on/off pins if I purchase a couple different pins?
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Old 05-07-2010, 11:14 AM   #8 (permalink)
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You shouldn't have a problem unless your automag is very old. Only early mags didn't have the reg holes lined up. You can check for yourself but unscrewing the back half of the valve. Just be sure the reg seat doesn't fall out and they you screw it on and off slowly.
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Old 05-07-2010, 11:28 AM   #9 (permalink)
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Bad shootdown is obvious when you try to shoot faster than you used to. You don't change your point of aim, but the paint keeps falling shorter as you try to shoot faster. Everything works great at slower rates. If you don't notice it, don't worry about it.

I would always let my son play test my classic pneu-mag because his fingers are about 50% faster than mine and I could watch the paint flight.

8-hole regs work, but all you need is for the hole in the valve body to be directly across from the hole in the reg when the laser etching is lined up. I haven't heard of any matching up that were not at 12 o'clock. I think the valve body would have to be drilled at 12 anyway. If the gas has to go across the face of the reg to get into the valve, it slows down.

A 0.750 pin in a classic valve almost always works for 4 balls per second, but if you start looking for 6 or more it might be a hair long. I put a quad o-ring in a classic (with a 0.750 pin), which makes about 0.020 difference, and I could shoot less than once a second. That last bit makes a difference.
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