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Question: Co2 Gas Venting

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Question: Co2 Gas Venting

Unread postAuthor: frankrede » Thu Aug 03, 2006 8:21 pm

Is it possible to use Co2 as a airsource to vent a combustion chamber?
Say If I mounted a 9 ounce co2 bottle with a regulator to my cannon could i attach it to use it to blow out the old fumes?I know you guys are going to say try it and dont ask questioons but I want to be sure before I mutilate my cannon and waste money on my co2 setup.
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Unread postAuthor: SpudStuff » Thu Aug 03, 2006 8:22 pm

no because then there would ne no O2 in the chamber
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Unread postAuthor: benstern » Thu Aug 03, 2006 8:24 pm

Co2 will replace air and you won't get combustion due to lack of O2. CO2 is not an "airsource" because there is no air in it, it's friggen CO2!!!
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Unread postAuthor: mark.f » Thu Aug 03, 2006 8:35 pm

Drrrt DA DURRRR!!!!

J/k. :) Try and do it with HPA.
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Unread postAuthor: ProfessorAmadeus » Thu Aug 03, 2006 9:12 pm

Just use regullar o2 to vent it and use some accetaline (sp). :wink: NOOO!!!! DONT DO THAT!!!! but could you imagine?
Little johny sais " mommy mommy look at me!" Then BOOOOM!!! No more little johny.
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Unread postAuthor: M3NT4L » Thu Aug 03, 2006 9:39 pm

If you have a pneumatic gun shoot a blank w/o any ammo at the chamber (works for me) or pump air into into with some sort of a pump.
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Unread postAuthor: carlbelcher » Thu Aug 03, 2006 10:06 pm

M3NT4L you seriously fire your pneumatic at your combustion to vent the chamber?!

If you really don't want to vent your chamber the old fashion way (with you breath) or wave your cannon around to air it out, I would get a chamber fan. They serve a double purpose, they mix the fuel and air in your chamber which gives you a better explosion, and you can turn it on with your chamber open to vent the exhaust gases after your shot.
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Unread postAuthor: M3NT4L » Thu Aug 03, 2006 11:40 pm

Lol yeps ive tried it like twice, its because my shty marble combust has a realy uncomfortable chamber. Since the shooting air trick didnt work i put it on top of my air conditioning console and after a minute or two it cleares up.
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Unread postAuthor: frankrede » Fri Aug 04, 2006 12:58 am

carlbelcher wrote:M3NT4L you seriously fire your pneumatic at your combustion to vent the chamber?!

If you really don't want to vent your chamber the old fashion way (with you breath) or wave your cannon around to air it out, I would get a chamber fan. They serve a double purpose, they mix the fuel and air in your chamber which gives you a better explosion, and you can turn it on with your chamber open to vent the exhaust gases after your shot.

Ya, To vent it I usualy have to take the barrel+endcap off and wave it around alot. I should get a chamber fan. Any idea on the diameter of one?


Lolz using a potato gun to clean a potato gun. lolz
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Unread postAuthor: frankrede » Fri Aug 04, 2006 1:00 am

markfh11q wrote:Drrrt DA DURRRR!!!!

J/k. :) Try and do it with HPA.

Ok thanks, grr, This is getting expensive.
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Unread postAuthor: sgort87 » Fri Aug 04, 2006 8:33 pm

Actually, when you vent the chamber, what you are venting out is in fact actually CO2 (and water).

Think about it. What is a propane molecule made out of? (Say 3 Carbon and 8 Hydrogen atoms.) That's right, 3 Carbon and 8 Hydrogen atoms. You guys are smart! Now when propane is combined with 7 O2 molecules what do we get? (Say 3 CO2 molecules and 4 H2O molecules.) That's right again. We get 3 CO2 molecules and 4 H20 molecules.

So if we flush the chamber with CO2 aren't we just defeating the entire purpose of venting? I guess the only thing it does to help is get rid of the water vapor but it definately doesn't add any oxygen to the chamber.
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Unread postAuthor: frankrede » Fri Aug 04, 2006 9:36 pm

sgort87 wrote:Actually, when you vent the chamber, what you are venting out is in fact actually CO2 (and water).

Think about it. What is a propane molecule made out of? (Say 3 Carbon and 8 Hydrogen atoms.) That's right, 3 Carbon and 8 Hydrogen atoms. You guys are smart! Now when propane is combined with 7 O2 molecules what do we get? (Say 3 CO2 molecules and 4 H2O molecules.) That's right again. We get 3 CO2 molecules and 4 H20 molecules.

So if we flush the chamber with CO2 aren't we just defeating the entire purpose of venting? I guess the only thing it does to help is get rid of the water vapor but it definately doesn't add any oxygen to the chamber.

I think there is more than co2 fumes left over because when i tryed to blow the fumes out(stupid stupid stupid)with my mouth, I almost knocked myself out. I think I will use compressed air. Nitrogen paintball tank should work.
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Unread postAuthor: sgort87 » Fri Aug 04, 2006 10:52 pm

You aren't using pure propane. You are using an aerosol spray fuel with a propane propellant that ignites. The problem is that the rest of the crap in the spray does not ignite and it stays in your chamber and smells horrible.

If you are using pure propane or ether or butane etc, there is nothing else left in the chamber except has just combusted.
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Unread postAuthor: Shrimphead » Sat Aug 05, 2006 1:01 am

If you had taken enough breaths from the non-vented chamber, you probably could have gotten dizzy from lack of oxygen.
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Unread postAuthor: frankrede » Sat Aug 05, 2006 1:27 am

sgort87 wrote:You aren't using pure propane. You are using an aerosol spray fuel with a propane propellant that ignites. The problem is that the rest of the crap in the spray does not ignite and it stays in your chamber and smells horrible.

If you are using pure propane or ether or butane etc, there is nothing else left in the chamber except has just combusted.

Yes, I am currently using Axe. I am working on a regulated butane feed.
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