Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
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BOBBART
10:45:36 Fri
Jul 9 2010
Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
Question:
What is the PSI for a Crosman 12 Gram cartridge?
If I use a HPA 3000 PSI cartridge, will the FPS velocity increase on my Drozd?

Thanks,
Bobbart

Tbkahuna
11:43:50 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
The CO2 pressure will depend on the temperature. At 80 degrees it is about 1000 psi. A 12 gram cartridge by itself is not mechanically regulated, so unless there is a regulator in the gun, the gun will have the pressure of the CO2 and that will depend on the temperature.

HPA at 3000 psi, is just that... 3000 psi. However, in the typical paintball bottles, the fitting on the top of the bottle is a regulator. It controls the air, so the pressure that goes into the gun is regulated. Typical is 850 psi. You'll see on here discussions about the JDS regulators and higher pressures. The bottle pressure can drop from 3000 psi as the air is used up, but the regulator will only put out around 850 psi until it gets around the output pressure and the regulator stays open and delivers a lower pressure.

Did that answer your question?

Here is some information on CO2 pressures.

http://bb.bbboy.net/straferbbmachinegunownersgroup-viewthread?forum=6&thread=16&postnum=1&highlight=temperature

BOBBART
20:12:36 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
What if I adjust the regulator for 2000 PSI, can this be done? Will the FPS increase?

Thanks,
Bobbart

SONYtec
20:48:54 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
Quote: BOBBART at 20:12:36 Fri Jul 9 2010

What if I adjust the regulator for 2000 PSI, can this be done? Will the FPS increase?

Thanks,
Bobbart


If you are talking about CO2, you'll never get that pressure.

CO2 tanks do not have a regulator. If you were to fill a
HPA tank with CO2, I think the regulator would probably freeze up anyway.

BOBBART
21:31:59 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
Sorry, I was talking about a 48cu HPA tank.
What if I adjust the regulator for 2000 PSI, can this be done? Will the FPS increase?

Bobbart




Tbkahuna
22:09:59 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
I can't recommend that to anyone. Raising the pressure will increase velocity to a point. You can read here that some are pushing the limits of pressure. It isn't just a matter of higher pressure, though.

First, I don't believe the drozd valve is designed for that, so the potential exists for a catasrophic failure. If you have the magazine out of the gun and have removed the rear plug where the valve stem sticks out, you will see how thin the wall is on the valve, and it has threads cut in it. I would not pressure that valve that high.

Second, just having that pressure sealed in a valve won't do you much good if the valve cannot be opened. At 2000 psi the valve will take twice as much force to open as it does at 1000 psi. That is why you see so much about increasing the voltage and overdriving the solenoid to get the valve open. There will be a limit.

TBK

drozdandconfused
22:46:51 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
I don't think it's a good idea either. Too much strain on the gun especially on burst. It would be very difficult to fully open the valve. This is an old post of a guy that was at 2000 psi and about to try 2500 psi and was never heard from again...:ohwell:

http://bb.bbboy.net/straferbbmachinegunownersgroup-viewthread?forum=10&thread=2108&postnum=0&highlight=2500

Draw your own conclusion.

SONYtec
23:39:29 Fri
Jul 9 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
I think with the Drozd it wouldn't be beneficial only because there isn't a good seal at the mag and breach, which is a gas leak. Pressure is wasted in these two area's. The higher the pressure the more thats wasted.

As was pointed out, not much of a gain.

Looking at what TBK is doign with his design, he has a closed breach and getting great FPS for the PSI used. I see his setup could handle 2000 PSI with who knows what FPS.

To answer your question:

I don't think you'll be able to shim a reg to 2000 psi. The reg's are made for 850 psi, yes you can up it but only to a point, depending on manufacturer.

JDS regs are built for the specific outputs. needless to say, safer.



BOBBART
09:34:55 Sat
Jul 10 2010
Re: Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
OK Thanks everyone for your replies back.
I think I will stick with the 850 PSI, I don't want to take a chance and damage the Drozd.
I wish Drozd would come up with a much higher FPS and a Hi-Cap Mag.

Bobbart



Pressure for Crosman 12 Gram CO2 compare to HPA 3000 PSI
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