CO2 powered M98 pressure questions...
Printed From: Tippmann Paintball
Category: Paintball Equipment
Forum Name: Upgrades and Customizing
Forum Description: Trick it out!
URL: http://www.tippmannsports.com/forum/wwf77a/forum_posts.asp?TID=173847
Printed Date: 23 May 2026 at 6:32pm
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Topic: CO2 powered M98 pressure questions...
Posted By: motopsycho650
Subject: CO2 powered M98 pressure questions...
Date Posted: 01 March 2008 at 9:37am
I'm just trying to learn more about CO2 pressures before I decide to buy a regulator or not.
Currently, I play with either a M98 w/ Flatline, or a 98C w/ responce trigger. Internally, both guns are almost identical. I polished the receiver internals, and run stock everything except front bolts. My M98 has an old PMI Hyper Star bolt, while my 98C has a ShockTech Super-Fly bolt. Both guns have a Tippmann Expansion Chamber, and I run a remote line with each for the tank.
Okay, being the tank is on a remote, and usually kept vertical while I'm playing, is it still possible to get liquid CO2 in the gun?
Secondly, What kind of PSI are we talking about inside these guns? A standard CO2 tank rupture disk with blow at 3000 PSI. When attached to the gun, many more square inches are added, so the PSI should be much less when hooked up. I've read a stock 98 operates best at around 750 PSI, but how much is actually in the gun without a regulator? (Assuming the tank is at max PSI without blowing, I know CO2 is affected by temp)
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Replies:
Posted By: ShortyBP
Date Posted: 01 March 2008 at 10:46am
Without getting too involved with the actual numbers (because I don't remember them... my memory is poor)... CO2, depending on outside temperature, is usually in the 750-850psi range. If I'm wrong, someone will be quick to correct me. This is the output pressure of the CO2 tank. Regardless as to the volume inside your gun... it should remain relatively constant until the tank is at or near empty.
Running remote with the tank vertical, and with the addition of an expansion chamber... the risk of liquid CO2 entering the valve is limited. You'll have greater risk during cold weather... during the height of summer, it's doubtful you'll have any issues. Regardless, the 98's valve can handle liquid if need be.
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