C02 inflator, where did it all go?

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Hebden
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C02 inflator, where did it all go?

Postby Hebden » Mon Dec 01, 2008 10:25 pm

Hey Guys,

I used my CO2 inflator yesterday for the first time. It was early in my ride but I was mightily impressed with the awesomeness of a nicley inflated tyre at the turn of a valve. 8)

However, toward the end of my ride the pressure had dropped dramatically, to the point where I was tempted to try and pump it up again.

I thought the replacement tube I used, which already had a patch on it, had a leak. But when I got back I checked it and it was fine. I inflated with my trusty floor pump and the pressure stayed as per normal.

I know that the CO2 escapes from the tube faster than regular air but that was quick! Is it escaping or is it a case of the CO2 changing temperature or something? :?

It was a little over 5 hour ride and I inflated at about 40 minutes in. I would estimate I lost at least 1 third of my pressure in about 4 hours. :shock: Is that normal?

Cheers,
Mark

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sogood
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Postby sogood » Mon Dec 01, 2008 10:53 pm

Are you sure there wasn't another leak, or a dirty valve head causing this observation?
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Dial
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Postby Dial » Tue Dec 02, 2008 8:51 am

Don't know if your rate of lose is normal but they do deflate. Not sure, It's either the C or the O that escapes. I've filled up on CO and managed to ride to work 20k, leave the bike all day and ride home and the pressure is still OK. So they definitely can take a beating for 2 hours.

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Postby Hebden » Tue Dec 02, 2008 8:59 am

sogood wrote:Are you sure there wasn't another leak, or a dirty valve head causing this observation?


I rode that same tube this morning after pumping it up last night. It still has good pressure in it now. It may have been a dodgy valve, I should really put those plastic caps on, but I keep loosing them. :?

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Spiza
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Postby Spiza » Tue Dec 02, 2008 1:23 pm

Hebden wrote:
sogood wrote:Are you sure there wasn't another leak, or a dirty valve head causing this observation?


I rode that same tube this morning after pumping it up last night. It still has good pressure in it now. It may have been a dodgy valve, I should really put those plastic caps on, but I keep loosing them. :?

Hey Mark, It probably was just a dodgy seal on the valve. If you don't mind sacrificing another CO2 cartridge... try it again but double check the valve with some soapy water or spit. It would be interesting if it did lose pressure again.

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leojvs
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Postby leojvs » Tue Dec 02, 2008 4:20 pm

Ive not had that problem when I use the co canister.
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sogood
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Postby sogood » Tue Dec 02, 2008 4:25 pm

CO2 is cold. I wonder if the valve was temporarily affected by the cold?
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Andrew69
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Postby Andrew69 » Tue Dec 02, 2008 9:01 pm

sogood wrote:CO2 is cold. I wonder if the valve was temporarily affected by the cold?
It wouldnt be the first time a valve has been frozen open/closed by a CO2 cartridge
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Postby sogood » Tue Dec 02, 2008 9:18 pm

Dial wrote:Don't know if your rate of lose is normal but they do deflate. Not sure, It's either the C or the O that escapes.

Was that supposed to be a bit of humour? Or were you serious with that explanation? :roll:
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Spiza
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Postby Spiza » Tue Dec 02, 2008 11:34 pm

sogood wrote:
Dial wrote:Don't know if your rate of lose is normal but they do deflate. Not sure, It's either the C or the O that escapes.

Was that supposed to be a bit of humour? Or were you serious with that explanation? :roll:

Maybe it's the 2 that's escaping :wink:

I didn't think of the frozen valve... I think you've hit the nail on the head.

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Postby Hebden » Wed Dec 03, 2008 7:53 am

Spiza wrote:
sogood wrote:
Dial wrote:Don't know if your rate of lose is normal but they do deflate. Not sure, It's either the C or the O that escapes.

Was that supposed to be a bit of humour? Or were you serious with that explanation? :roll:

Maybe it's the 2 that's escaping :wink:

I didn't think of the frozen valve... I think you've hit the nail on the head.


Yep dodgy valve. I am glad because I love the CO2 inflator. Its so quick!

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Postby Dial » Wed Dec 03, 2008 11:19 am

"despite its larger size, the CO2 molecule is slightly soluble in rubber" and so leaks out of the tube within a few days.

see the part on CO2 Inflators
http://en.wikipedia.org/wiki/Bicycle_pump

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vitualis
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Postby vitualis » Wed Dec 03, 2008 11:37 am

CO2 does leak out of tubes at a slightly faster rate than air but that phenomenon wouldn't explain the OP first post.

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Postby Dial » Wed Dec 03, 2008 11:54 am

Never said it did

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Postby vitualis » Wed Dec 03, 2008 3:31 pm

Dial wrote:Never said it did


Why did you bother posting it then? :?

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Postby Dial » Wed Dec 03, 2008 5:20 pm

vitualis wrote:
Dial wrote:Never said it did


Why did you bother posting it then? :?

Regards.


Because it's not to far removed from my experience with CO2. If I fill with CO2, my tyre will be as good as flat the next morning.

So depending on the canister used, the tyre size and the thickness of inner... it could have been the reason.

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