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Old 01-13-2010, 05:10 PM   #1 (permalink)
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Which Valve hole works best???

I was wondering what vent hole of the four on the valve is most recommended for the VM-68. Iíve always set the whole that is just larger than the smallest diameter hole facing up when installing the valve. Iím guessing this is just one more way to regulate the amount of air that is released with every shot although I'm pretty sure they all release pressure due to the placement of the 2 o-rings. Thanks for the input!!
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Old 01-13-2010, 07:15 PM   #2 (permalink)
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Depends on the velocity you're trying to get and how your gun is set up.The holes are your primary velocity adjustment and the screw in the bolt is the secondary adjustment.I used to run mine on the largest hole and do some fine tuning via the bolt,but,sometimes I had to adjust the valve down one as I was using co2 at the time.
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Old 02-17-2010, 01:18 PM   #3 (permalink)
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Valve holes are indeed the primary adjustment method.

For the best performance, I found that putting a regulator in the front asa and then running the tank in a bottomline or rear asa adapter was the way to go. Or.. if you can find one, a VTS from Skanline (good luck with finding one though as they haven't been made in over 10 years and they hardly ever pop up for sale)

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Old 02-17-2010, 01:23 PM   #4 (permalink)
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I found I always needed the largest valve hole for HPA, or even needed to drill it out for more.
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Old 02-17-2010, 01:27 PM   #5 (permalink)
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That's because HPA does not expand from a liquid state to a gas state. VM's were designed to use CO2... of course god forbid if you had the gun set up to run on gaseous CO2 and you got liquid in the valve and it didn't expand... or your pressure dropped... freaking jackhammer. Either way, use you would possibly need to modify the valve for HPA if you do not have a spring tension type velocity adjuster for the main spring.

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Old 02-17-2010, 11:41 PM   #6 (permalink)
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the big expansion chambers can act as volumizers . . . my air america black rain VM runs pretty well on HPA

as for the valve holes, I always seem to end up on the biggest setting and then use the bolt for tweaking velocity. on my $20 wonder I drilled the largest valve hole out as big as possible since its one of the later bodies with the big transfer port, and just use a regulator to tweak velocity

also - I always ditch the valve spring in all my VM's
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Old 02-19-2010, 10:42 PM   #7 (permalink)
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I found I always needed the largest valve hole for HPA, or even needed to drill it out for more.
Going to have to try this one out, my VM's hate HPA with a passion. Any suggested hole size?
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