old - Fazer Owners Club - old
General => General => Topic started by: 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,
-
No realworld benefit apparently...
http://www.theaa.com/motoring_advice/safety/filling-tyres-with-nitrogen.html
-
mobile tyre fitters used to use nitrogen, easier than having a petrol compressor to inflate them
-
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%.
-
Why does only o2 permeate through the tyre, and not nitrogen?
-
Molecular size perhaps?
-
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.
-
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.
-
I used to be a trimix diver, don't fill your tyres with helium :lol
-
Send her over here and I can replace the air for fresh for only a quid... probably needs doing weekly