[DeTomaso] Tires, Tire Life, and Nitrogen

Wed Aug 13 16:16:26 EDT 2008

A nitrogen atom 7 on the periodic table is smaller than an oxygen atom 8 
on the periodic table.

I don't think anybody is regularly placing Oxygen in their tires. They 
are using air (compressed atmosphere) which is composed of roughly 78% 
N2, 20% O2, 1% Ar and < 1% CO2. It's also full of water vapor, pollen, 
dust ... in other words, lots of variables

I think I saw Jack write that Nitrogen as supplied in the US is 
basically 100% N2 with pretty well no pollutants.

So predicting pressure vs temperature is easier with N2 than it is with 
compressed air.

If anything is escaping the tire, I would think that the lighter N2 
molecules would escape at a higher rate than the heavier O2 molecules (I 
am assuming the N2 molecule is the smaller, but the bonds could make a 
difference in size). Also I think that the rate of tire deflation 
between air (78% N2) vs N2 would be roughly 1/5th slower, not a big 
difference.

Asbestos Pants On, for any mistakes I may have made ;-)

Roydon }8~)>

Larry - Ohio Time Corp wrote:
> Tomas,
>
> It should be the amount of water in the compressors air. I recall opening
> tires that had a gallon of water in them. 
>
> Going back to an earlier statement. Nitrogen atoms are larger and will not
> escape a tire as an oxygen atom would. If that was true after time would you
> not only have nitrogen in the tire anyways???
>
> Larry - Cleveland
>
> -----Original Message-----
> From: detomaso-bounces at realbig.com [mailto:detomaso-bounces at realbig.com] On
> Behalf Of Tomas Gunnarsson
> Sent: Wednesday, August 13, 2008 2:46 PM
> To: detomaso at realbig.com
> Subject: Re: [DeTomaso] Tires, Tire Life, and Nitrogen
>
> Their explanation mentions humidity but for some odd reason they explain it
> as if ambient humidity would make a difference. What would matter is the
> humidity where the tires were filled IMO which is not neccessarily where
> they're used. I do understand that the amount of water in the tire matters
> but for street driving it sounds plain silly.
>
> Tomas
>
> ----- Original Message ----- 
> From: <michael at michaelshortt.com>
> To: "Tomas Gunnarsson" <guson at home.se>
> Cc: <detomaso at realbig.com>
> Sent: Wednesday, August 13, 2008 7:33 PM
> Subject: Re: [DeTomaso] Tires, Tire Life, and Nitrogen
>
>
>   
>> http://auto.howstuffworks.com/question594.htm
>>
>> here you go.
>>
>> Michael in Savannah
>>
>> On Wed, Aug 13, 2008 at 1:11 PM, Tomas Gunnarsson <guson at home.se> wrote:
>>
>>     
>>> Seriously, why doesn't nitrogen expand with temperature like air?
>>>       
> Assuming
>   
>>> minimal amounts of water in the tire PV=nRT should apply.
>>>
>>> Tomas
>>>
>>> ----- Original Message -----
>>> From: <MikeLDrew at aol.com>
>>> To: <cdifani at pacbell.net>; <detomaso at realbig.com>
>>> Sent: Monday, August 04, 2008 10:44 AM
>>> Subject: Re: [DeTomaso] Tires, Tire Life, and Nitrogen
>>>
>>>
>>>  > In a message dated 8/3/08 19 56 0, cdifani at pacbell.net writes:
>>>       
>>>>         
>>>>> My question is: Anyone use nitrogen in their tires? And if so, what do
>>>>>           
>>> you
>>>       
>>>>> think about it? Anybody preparing to do so? If so, why?
>>>>>
>>>>>           
>>>> Costco fills their tires with nitrogen.   Just take your tires there
>>>>         
> and
>   
>>> ask
>>>       
>>>> them, and they'll empty and refill them.
>>>>
>>>> That said, you won't see any advantages whatsoever, so there's no point
>>>>         
>>> in
>>>       
>>>> doing it.   If you are racing, nitrogen doesn't expand with heat the
>>>>         
> way
>   
>>> air
>>>       
>>>> does, so your tire pressures don't change during the course of a race
>>>>         
> and
>   
>>> alter
>>>       
>>>> your handling.
>>>>
>>>> For you?   You've got an air compressor in your garage--use it. :>)
>>>>
>>>> Mike
>>>>
>>>>
>>>> **************
>>>> Looking for a car that's sporty, fun and fits in your
>>>> budget? Read reviews on AOL Autos.
>>>>
>>>> (
>>>>         
> http://autos.aol.com/cars-BMW-128-2008/expert-review?ncid=aolaut000500000000
> 17)
>   
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>>
>> -- 
>> Michael L. Shortt
>> Savannah, Georgia
>> www.michaelshortt.com
>> michael at michaelshortt.com
>> 912-232-9390
>>
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