Date: 24-05-24  Time: 12:59 pm
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Author Topic: nitrogen tyres.  (Read 1506 times)

taylor

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nitrogen tyres.
« on: 23 September 2013, 09:09:42 pm »
the wife,y bought some tryes for the car they have filled them with nitrogen, any reason why, ? only a fiver,
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sent from my carafan in tenby, ;)

DryRob

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Re: nitrogen tyres.
« Reply #1 on: 23 September 2013, 09:19:14 pm »
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thou shalt not kick

chaz

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Re: nitrogen tyres.
« Reply #2 on: 24 September 2013, 12:33:03 am »
mobile tyre fitters used to use nitrogen, easier than having a petrol compressor to inflate them
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Farjo

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Re: nitrogen tyres.
« Reply #3 on: 24 September 2013, 01:32:06 am »
Perhaps tyres will end up with almost 100% nitrogen after a while and here's my theory. Buy a new tyre which is filled with normal air (78% nitrogen, 21% oxygen). Some of the oxygen permeates through the tyre so you re-inflate it with air. Assuming the tyre pressure went down by 10% the tyre is now filled with the original 78% Nitrogen and 21% Oxygen, minus the lost 10% oxygen, plus the replaced 7.8% Nitrogen and 2.1% Oxygen = 85.8% Nitrogen and 13.1% Oxygen.

Repeat several times and the proportion of Nitrogen will steadily rise, not to 100% but presumably into the high-90s%.
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jon

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Re: nitrogen tyres.
« Reply #4 on: 24 September 2013, 06:15:21 am »
Why does only o2 permeate through the tyre, and not nitrogen?
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positron

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Re: nitrogen tyres.
« Reply #5 on: 24 September 2013, 06:48:03 am »
Molecular size perhaps?
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Lawrence

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Re: nitrogen tyres.
« Reply #6 on: 24 September 2013, 12:21:42 pm »
It's something to do with nitrogen expanding less with heat, so the pressure stays more constant.
 
It might make a difference in F1, but in a road car?  Probably not.
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Jamieg285

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Re: nitrogen tyres.
« Reply #7 on: 24 September 2013, 12:36:55 pm »
Quote from: taylor on 23 September 2013, 09:09:42 pm
the wife,y bought some tryes for the car they have filled them with nitrogen, any reason why, ? only a fiver,


So that someone can make money for no real reason.
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JZS 600

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Re: nitrogen tyres.
« Reply #8 on: 24 September 2013, 02:56:09 pm »
I used to be a trimix diver, don't fill your tyres with helium  :lol
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jon

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Re: nitrogen tyres.
« Reply #9 on: 24 September 2013, 07:27:13 pm »
Send her over here and I can replace the air for fresh for only a quid... probably needs doing weekly
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