don't fill your tires with air - Page 2 - Mercedes-Benz Forum

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post #11 of 20 (permalink) Old 09-13-2004, 11:08 PM
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RE: don't fill your tires with air

The sole advantage is: nitrogens thermal stability compared to 'regular' air. Racers have been doing this for a few (maybe more) years. But if your not racing then the thermal expansion of the 'gas' inflating your tires is not that big a deal, or maybe it is...?

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post #12 of 20 (permalink) Old 09-14-2004, 03:17 AM
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RE: don't fill your tires with air

Quote:
miked300TE - 9/14/2004 1:08 AM

The sole advantage is: nitrogens thermal stability compared to 'regular' air. Racers have been doing this for a few (maybe more) years. But if your not racing then the thermal expansion of the 'gas' inflating your tires is not that big a deal, or maybe it is...?

miked
Its not even April first. The reason for using a pure gas instead of air is to predict the inflation pressure in direct proportion to heat. This is of course well documented in your high school science textbooks.

Now if you move to the next chapter you will read about chemical equilibria and the effects of smog at different temps. As the temp rises the pollutants in air form alternate compounds leading to an uncertainty in the final molar mass of the air in the tyre and leading to a shift in the final volume and subsequent pressure. All of which is totally reversed on cooling.

total unknown volume results in errors of 1% which is measureable in racing cars. The application on planes is that an exploding tyre does not combust its contained gas when landing.

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post #13 of 20 (permalink) Old 09-14-2004, 12:31 PM
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RE: don't fill your tires with air

N2 is also dry. Have you ever seeen the moisture around the valve stem when adding air to a tire? That moisture ends up inside the tire and stays there until the tire is removed from the rim. I used to have some alloys that were real "mags" ie: MG and they corroded really badly from humid air being pumped into them.

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post #14 of 20 (permalink) Old 09-14-2004, 01:05 PM
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RE: don't fill your tires with air

Quote:
n5160u - 9/14/2004 2:31 PM

N2 is also dry. Have you ever seeen the moisture around the valve stem when adding air to a tire? That moisture ends up inside the tire and stays there until the tire is removed from the rim. I used to have some alloys that were real "mags" ie: MG and they corroded really badly from humid air being pumped into them.
Metal in the alloys or Mg as you point out can only corrode when in contact with another metal of a different potential, like the wheel nuts, the hub and balancing weights. Yes, the small weights on the rims can corrode the metal.

The contained water on the other hand does nothing because it can not form a circuit.

The same thing happens when you mismatch the metals in any type of multi-component system. The several metals form a battery where electrons migrate (from the rims in your case) to the car or from the car. That and the fact that under enormous stress metals are constantly reworked and the crystals fatigue.

The most likely cause of metal degradation in alloys is
- electrolytic oxidation
- impurities
- stress
- uneven cooling or poor casting

Water inside the air inside the tire would only do something if the rim was attached to ground with an earthing strap, such as might happen in storage.

That would be the Science chapter on Galvanni and electricity.

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post #15 of 20 (permalink) Old 09-14-2004, 03:21 PM
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RE: don't fill your tires with air

No need for smart alec remarks, miroj.

How does your 1st paragraph differ from my post that you so graciously quoted.

'Thermal stability' ~ two words (perhaps a euphemism) to express your whole missive...
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post #16 of 20 (permalink) Old 09-16-2004, 07:10 PM
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RE: don't fill your tires with air

"Why not fill your tires with Hydrogen? It did wonders for the hindenburg"
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post #17 of 20 (permalink) Old 09-16-2004, 07:59 PM
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RE: don't fill your tires with air

Quote:
miked300TE - 9/14/2004 5:21 PM

No need for smart alec remarks, miroj.

How does your 1st paragraph differ from my post that you so graciously quoted.

'Thermal stability' ~ two words (perhaps a euphemism) to express your whole missive...
Perhaps not as it would need to be described as thermally unstable. But if you can detect 1% variations then knock yourself out - call it what you will.

All gases obey the same law when heated unless they undergo secondary reactions.

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post #18 of 20 (permalink) Old 09-16-2004, 10:58 PM
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RE: don't fill your tires with air

EVERYONE RELAX.......HAVE A GOOD TIME.
These Benz forums get so so uptight sometimes.
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post #19 of 20 (permalink) Old 09-17-2004, 03:12 PM
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RE: don't fill your tires with air

Oops To Late. I already filled my tires with air from local gas station. Needed to get them filled up. Will it do anything to the tires?
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post #20 of 20 (permalink) Old 09-17-2004, 03:14 PM
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RE: don't fill your tires with air

Quote:
BenzGirl04 - 9/17/2004 5:12 PM

Oops To Late. I already filled my tires with air from local gas station. Needed to get them filled up. Will it do anything to the tires?
At a guess it will make them work properly.

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