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post #1 of 9 (permalink) Old 01-05-2007, 04:40 AM Thread Starter
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Wink Nitrogen???

What is all the hoopla about putting Nitrogen instead of air in tires?? anyone done it??
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post #2 of 9 (permalink) Old 01-05-2007, 05:18 AM
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post #3 of 9 (permalink) Old 01-05-2007, 08:38 AM
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If it is free, then I am all for it. If it is .01 or more, then I will take my cool refreshing free 84% nitrogen compressed atmosphere.

Really, I see it for competition and for long haul and maybe for fleets, but the everyday driver and even an enthusiast it is not worth the price some places are getting for it. I understand they need to recoup the price of there expensive equipment that gets the nitrogen out of the air, but some are 60 bucks a car (but with free refills for life, about what a 1 hp small tank compressor costs).

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post #4 of 9 (permalink) Old 01-05-2007, 04:44 PM
 
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I believe nitrogen is also common in many racing series because it doesn't expand as quickly as atmosphere as the temperature rises (so tire pressure undergoes smaller changes throughout a run), but I could be wrong on that.
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post #5 of 9 (permalink) Old 01-05-2007, 04:53 PM
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When there's a fire and the tires "blows" up...having it filled with N is better than regular air, as N won't add O to the fire...

...also N doesn't expand like regular air, so once you have it inflated to what you want it at, it'll stay closer to that than if you used regular air.

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post #6 of 9 (permalink) Old 01-05-2007, 08:49 PM
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More stable, no water, bigger molecules. 78% N is enough for me.

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post #7 of 9 (permalink) Old 01-05-2007, 10:43 PM
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Quote:
Originally Posted by mercutio
I believe nitrogen is also common in many racing series because it doesn't expand as quickly as atmosphere as the temperature rises (so tire pressure undergoes smaller changes throughout a run), but I could be wrong on that.
It's true, but not for the reason you infer; it's because the nitrogen is dry. Water vapor expands faster than nitrogen or air. If you had completely dry air and completely dry nitrogen, any difference in the rates of expansion would not be measureable.

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post #8 of 9 (permalink) Old 01-06-2007, 08:13 AM
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I run it in my truck tires just because the pressure always changes but with this i dont have a problem at all

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post #9 of 9 (permalink) Old 01-13-2007, 10:40 PM
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The big difference is the water content...

The water vapor in the air in our tires has more to do with the pressure variations than anything. Humidity here runs 90% in the summer...

Water expands ~1600 times in volume from 0 to 100C.

Water vapor in the air is concentrated in the compressed air, unless you have a dryer in the line, like for a paint booth.

Nitrogen out of a bottle is dry; (otherwise it freezes coming out of the regulator) so less expansion/contraction. But it only works if the tire is mounted and backfilled with nitrogen, otherwise there is a lot of standard, humid air in there...

Easiest answer: Fill your tires when it's really cold outside, so the humidity is low!

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