No one is disputing what you have observed ^ Chris, just pointing out that the effect you observe is most likely due to the water content in the compressed air mix, rather than something being magical about pure nitrogen. Racers should consider using it...........to maintain more consistent pressure over a wide range of hot temperatures. Some fanatics may argue they need this feature for normal road use..........let them buy the nitrogen.
Helium in Tyres
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, Jul 27 2006 06:11 PM
28 replies to this topic
#27
REDA9X
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Posted 28 July 2006 - 08:08 PM
I have been throwing this question around at work all day with the engineers and fellow instructors and the general concensous is that nitrogen is less affected by temperature / pressure variations than straight compressd air. This may be as has been stated, purely due to the moisture content.
#28
_Mondie_
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Posted 28 July 2006 - 08:30 PM
Nitrogen in tyres reduces loss of pressure due to the escape of gas through the tyre (rubber is not completely inpermeable) and it also results in cooler running temperatures over compressed air. l would think that both of these advantages would be minimal in a road tyre and would offer most benefit in aircraft, racing applications etc where the extra cost can be justifed.
In a road car, a waste of time IMO.
In a road car, a waste of time IMO.
#29
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Posted 28 July 2006 - 09:08 PM
Its amazing how thinly the facts are spread and how much heresay there is on this topic. It certainly shows how easy it is to penetrate a niche market with little real product data.
Couldnt really see any reason as to why nitrogen tyres would run cooler than standard compressed air mix at the SAME pressure..............Anyway did some surfing.........the toyo site offers the explanation to this that the water in the compressed air mix behaves in an "unpredictable' fashion when heated and this causes the compressed air mix to become hotter........not so sure, they dont back it up with any real data. http://www.toyo.com....ech_info11.html
The leakage one puzzles me, if we keep topping up our tyres with a 80/20 nitro/OX mix and the oxygen leaks out......supposedly 3 times faster, then over a period of time the percentage of nitrogen in the tyre will increase and the rate of leakage will get less...has anyone noticed this......again here facts are thin on the ground.......most leakage is apparently through the rim seals and valves anyway? Nothing is mentioned about how well water vapor goes across the "permeable" rubber either
Another site I stumbled across, has thrown up just about everything discussed here http://www.eng-tips....e=1........even I didnt last the distance.
Couldnt really see any reason as to why nitrogen tyres would run cooler than standard compressed air mix at the SAME pressure..............Anyway did some surfing.........the toyo site offers the explanation to this that the water in the compressed air mix behaves in an "unpredictable' fashion when heated and this causes the compressed air mix to become hotter........not so sure, they dont back it up with any real data. http://www.toyo.com....ech_info11.html
The leakage one puzzles me, if we keep topping up our tyres with a 80/20 nitro/OX mix and the oxygen leaks out......supposedly 3 times faster, then over a period of time the percentage of nitrogen in the tyre will increase and the rate of leakage will get less...has anyone noticed this......again here facts are thin on the ground.......most leakage is apparently through the rim seals and valves anyway? Nothing is mentioned about how well water vapor goes across the "permeable" rubber either
Another site I stumbled across, has thrown up just about everything discussed here http://www.eng-tips....e=1........even I didnt last the distance.
Edited by devilsadvocate, 28 July 2006 - 09:15 PM.
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