Here’s a dumb question, but being a relative newb…
…who has never owned a “bulk fill” co2 gun…I’m going to ask it.
How will I know when the tube is filled up?????????????????? Also, whats the best tank to get to use for filling. They have some at wally world, but I was wondering what the best size will be to limit trips to the paintball park…. Thanks.
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I was referring to paintball bottle sizes. What is the volume of your reservoir? See the quote and link below to convert that into weight.
http://www.warpig.com/paintball/technical/gasses/co2dynamics.shtml#3
A “full” tank contains about 34% liquid CO2. If it is filled any more, the CO2 will become very sensitive to temperature changes, with a small increase in temperature causing a large increase in pressure. This is a dangerous situation which is avoided by only partially filling the CO2 bottle.
One cubic inch of water weighs 0.577 oz and the specific gravity of liquid CO2 is 1.977 gm/cc so one ounce of liquid CO2 has a volume of 0.877 cubic inches. CO2 bottles generally have a full-fill to volume ratio of about 2.57 cubic inches per ounce of CO2, so that one ounce of CO2 will take up 0.877/2.57 = 34% of the total volume of the bottle.
The figure of 68% is often quoted as the volume of liquid in a full bottle, but this error probably stems from translating “ounce” into volume using water as the standard. Water is 1.00 gm/cc, or about half the density of liquid CO2 so that if a CO2 bottle is filled to its rated capacity with water, it will be 68% liquid by volume.
Is that 90z for a 2260 tube?
Its good to know you can’t “over fill”.
Thanks guys!
Academy fills your cylinder while its hanging on a weighing scale. They connect the big cylinder to yours and while its hanging they open the valve until its 9oz (etc) heavier.
+1 on Tim.
Note that you cannot overfill with CO2. If you have a larger vessel with CO2 and are filling a smaller vessel, it will not overfill… but the idea is to fill with the LIQUID CO2, hence why WOK stated to weigh the gun. Some folks even put the gun, tube, whatever… in the freezer prior to filling.
The best method is to weight the gun and then add the CO2 while weighing the gun.
The best guy to talk to about what you need is Tim McMurray. He will have what you need and can fill you in on the proper method as well as the adapters you need.
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I also learned from co2 dynamics before I filled up one of my pcp with co2. I dont have a siphon tube, so everytime I filled my gun I put a bag of ice on my airtube, 5 to 15minutes and it’s filled up to 100% rate.
its important to know the volume of your airtube, then calculate it to know how much co2 can be filled to (to avoid overfill).
then, I tuned gun by change the hammer spring to get the best shot I can get with co2. in this case I was able to get 700 fps ish with 0.5gram per shot consumption (.177).
after that, just like BB said, hours of fun! 😀 😀 😀
edit: this is the gun I was talking about
