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Old 03-31-2010, 12:24 PM   #1 (permalink)
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Classic Valve going from HPA to co2

I run a Classic Valve with HPA. Next week I'm playing my first game of 2010 and I'm thinking about running a small co2 tank and 40rnd hopper just to see how small I can make my set up (and it'll be about 70 degrees). Anyways, I'm just wondering if I need to do any thing to the Classic Valve (besides perhaps adjust the velocity) for co2 use.

I ask because I think I MAY have done something to the Valve for HPA, but I forget. It was almost 8 months ago since I messed with it and my Cyborg was my main marker for most of last year, so its been a while.
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Old 03-31-2010, 12:34 PM   #2 (permalink)
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you'll need to run an expansion Chamber to get the right input pressure. and there will be some small velocity adjusting.
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Old 03-31-2010, 12:37 PM   #3 (permalink)
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I was wondering last night. I run the air from ASA to vertical grip to Valve. Can the vertical grip (I have a Tac-One) act as a sufficient expansion chamber?
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Old 03-31-2010, 12:50 PM   #4 (permalink)
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If you're just running a 40 round hopper, I'm guessing you're not going to be running long strings at high bps, so I think you'd be good. You start to run into problems with Mags and CO2 when you're shooting a lot and shooting fast. If you don't go with an expansion chamber, you may want to check out an anti-syphon tank though.
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Old 03-31-2010, 12:53 PM   #5 (permalink)
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Any extra space helps but an actual expansion chamber would be better. Using an angled asa/drop helps a little too. Installing an anti-siphon tube in the tank would help with liquid as well.

If you are going for a small setup, why not try to run the bottle vertical? It makes for a small setup and keeps liquid out of the gun.
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Old 03-31-2010, 12:58 PM   #6 (permalink)
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I'm not a fan of vertical tanks... plus I'm not buying anything new, so I'll be running a 9oz tank which I wouldn't mind using as a stock type of deal.

I'll throw on an expansion chamber then, thanks for the help. Glad I don't have to mess with the actual Valve. And another question, is co2 OK to use with macroline? I'd assume it is and my marker won't explode, but I've never done that before so I just want to make sure.
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Old 04-04-2010, 11:38 PM   #7 (permalink)
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Just as a safety precaution:

Anytime you remove the valve on a C02 tank remember to ALWAYS change the Main O-ring...(this is the seal that holds all of the pressure in the tank). I made it a religious practice since running into someone who didn't and nearly blew the tank off the brass threading...
Here are my procedures:
1. Degass and test pin-valve again
2. Use Vice on Brass valve and 'Craftsman Strap Wrench' on Tank Bottle
3. Set up and replace Main O-ring (cover main o-ring with Molykote DOW-33 grease)
4. Locktite is a good idea to prevent Accidential discharge when removing bottle.
5. Re-install Brass Valve to Tank Bottle with Vice and Strap Wrench...as Tight as you can!!!
6. Test Fill 33% (Ghetto Hydrotest)
7. Top off Fill 100% (Final Ghetto Hydrotest)
8. Empty or Shoot-out Tank.
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Old 05-02-2010, 08:46 PM   #8 (permalink)
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How would performance change if you put a PPS Stabilizer on a Classic Mag instead of an expansion chamber?
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Old 05-02-2010, 09:00 PM   #9 (permalink)
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It's a good idea if you're exclusively using CO2. It's almost like adding a regulator to the CO2 tank. The idea is that the Stabilizer handles the pressure spikes from the CO2 so the AIR valve can focus on keeping velocity consistent.
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Old 05-02-2010, 09:06 PM   #10 (permalink)
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That's what I figured. But I have heard they don't work too well on Mags. I never understood why they wouldn't -- always pictured them as sort of a tank reg. Does anyone know how long a PPS Stab is?

I want to set up my Mag for an indoor field opening a mile from my house (hell yeah). Basically, they only do co2. My plan is to take a Classic Mag with a PPS Stabilizer at the foregrip, then run my tank backwards (I believe that is 'Hawaiian style') but I don't know how much clearance I need.


How's a Classic Mag perform with a PPS Stabilizer and co2 in the cold?
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