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Old 09-14-2006, 08:40 PM   #1 (permalink)
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PMI Turbo valve. Teach me.

Ive always wondered, whats with the PMI turbo valve? Are the for sheridans? Are they like a step up from the stock non-cart valve? Or, are they just a replacement for the stock blowback valvle in there semi-autos? Help a guy out.
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Old 09-14-2006, 09:03 PM   #2 (permalink)
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The turbo valve was a high-performance, high-flow replacement. It came with a custom hammer and springs (I think) and was purported to greatly-improved efficiency & consistency.
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Old 09-14-2006, 11:01 PM   #3 (permalink)
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They are for pre-cartrage valved brass

They only work on back bottle Sheridans (or with modification they could work on guns with a CA adapter in the front of the tube) due to the new cup seal not having a pierce pin. The claims are questionable, the theory is that a lighter hammer and larger ports would speed the dump into the chamber, but the hole connecting the valve to the barrel is the same size and quite difficult to enlarge. The pressure is the same (these were made before low pressure and even regulators were common so there is no advantage of less pressure (and more volume) to be gentler on the ball. The only difference that the valve would have is a lower cyclic weight; this is about useless on a pump because the recoil from pumping by far overpowers any valve train movement.

If you were to make a stroker (semi-auto conversion), took the time to enlarge the hole between the barrel and the valve, port and polish the valve, regulate the high pressure, and tune the springs to the gun, you may see a difference in performance with a turbo valve. In order for any of that to matter you would have to severely lighten the bolt and go with a light weight ram or the entire process is wasted.


EDIT: Keep reading the thread because aparently I am mistaken...
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Old 09-14-2006, 11:19 PM   #4 (permalink)
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Well, now just out of curiousity, on a non cart PGP, is that little indention where they'd soldered the tubes and then drilled the transfer hole?

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Emerald Wolf -- hates trying to line those holes up....
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Old 09-15-2006, 01:09 AM   #5 (permalink)
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Quote:
Originally Posted by Emerald Wolf View Post
Well, now just out of curiousity, on a non cart PGP, is that little indention where they'd soldered the tubes and then drilled the transfer hole?

Catchya on the Flip Side.....

Emerald Wolf -- hates trying to line those holes up....

On older Sheridans the holes were drilled before solder. There is a small "rivet" of brass that is soldered in between the tubes to make the actual soldering easier.

-Jake
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Old 09-15-2006, 10:27 AM   #6 (permalink)
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The indentation on the bottom and the slot on the top are to get solder between the valve and the valve tube, Imagine trying to solder the valve in from the end! I can't remember if the holes line up but it wouldn't surprise me, it would have been easier on the production line if all they had to do was drill through the tube instead of drilling half, flipping, moving it a bit and drilling again.

-Troy hates misaligning them too
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Old 09-15-2006, 09:20 PM   #7 (permalink)
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Quote:
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They only work on back bottle Sheridans (or with modification they could work on guns with a CA adapter in the front of the tube) due to the new cup seal not having a pierce pin.
Untrue. I have one with a pierce pin in my parts PMI-1. The valve stem is an original piece too because it has the metal insert in the brass stem where the hammer strikes it. Most if not all Turbo valves had this.
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Old 09-16-2006, 01:16 AM   #8 (permalink)
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So, would this be do anything for my PMI-1? Help 12 gram effency any?
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Old 09-16-2006, 03:10 AM   #9 (permalink)
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Yes, it will help 12gram efficiency. It's basically the same as a PPS efficiency tune except not to the extent they take it to. It increases flow, lightens the hammer, and has more efficient springing.
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Old 09-16-2006, 08:56 PM   #10 (permalink)
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Alright, it looks like i have found a cheaper alternative to sending my PMI to pps. Thanks guys.

(I still might send it in, the end. Not sure)
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