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Old 11-11-2007, 07:58 PM   #11
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Quote:
Originally Posted by TheDude
Its just a gimmic.
Yeah, it'* a sales gimmic. You don't actually need nitrogen in your tires on a street car.

However, Nitrogen is the gas of choice in a number of high performance applications (aircraft tires, racing tires.) not for any of the reasons mentioned.. it is done because the nitrogen is very dry. It doesn't contain any water vapor. As a result, it maintains it'* pressure over a very wide range of temperatures.

I've used it in the tires on my road-racing motorcycles, but I wouldn't waste any time or money putting it in any street car tires.
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Old 11-11-2007, 08:02 PM   #12
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I use nitrogen in my (plane) tires.

Only because they are such a pita to fill, and with nitrogen they don't react to the temperature changes as much as they do with an air fill.
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Old 11-11-2007, 08:46 PM   #13
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I found it to be a worth while investment...

No complaints here.
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Old 11-11-2007, 10:02 PM   #14
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This is the new thing in South FL.I don't know why but everyone was doing it before I move to Tn.
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Old 11-11-2007, 11:41 PM   #15
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Quote:
Originally Posted by ReallyAGXP
I found it to be a worth while investment...

No complaints here.
Air is a worthwile investment for me, and I have no complaints either. How have you benefited from the N2?

The air you breathe (and is normally pumped into your tires) is 70% Nitrogen already. Never pay for this service, and never let them put the stupid green caps on your valve stems.

It'* a gimmick. They're making about 400% profit off each tire they fill.
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Old 11-11-2007, 11:46 PM   #16
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so thats why i see people with those green caps...i just thought they were color blind
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Old 11-12-2007, 12:53 AM   #17
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GM'* TSB regarding it.
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Old 11-12-2007, 12:20 PM   #18
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Quote:
Originally Posted by willwren
Quote:
Originally Posted by ReallyAGXP
I found it to be a worth while investment...

No complaints here.
Air is a worthwile investment for me, and I have no complaints either. How have you benefited from the N2?

The air you breathe (and is normally pumped into your tires) is 70% Nitrogen already. Never pay for this service, and never let them put the stupid green caps on your valve stems.

It'* a gimmick. They're making about 400% profit off each tire they fill.
True statement - 'tis a gimmick indeed.
1. Using compressed air you're already putting more nitrogen than oxygen in your tires.

2. All gasses obey the Ideal Gas Law (in this particular situation). The thought that dry nitrogen will not change pressure due to changes in temperature is a myth.

3. Nitrogen is #7 on the periodic table of elements. Oxygen is #8. Therefore O is slightly larger than N. So much for the leak theory.

4. The amount of moisture contained in compressed air, per unit volume, is negligible based on the relatively low volume in tires when it comes to balance issues. Same goes for expansion/contraction theories.

5. DRY Nitrogen is used in aircraft tires for several reasons, one of them being fire safety; nitrogen is less likely to fuel/flare a fire if a tire fails during a mishap (imagine blowing on your campfire with compressed air!). Another major reason is corrosion control. While moisture may have little affect on balance or expansion, it does create problems with oxidation.

6. Don't stupid green valve caps match stupid green cars? :P
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Old 11-12-2007, 02:43 PM   #19
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Someone needs to repeat High School Chemistry...

Nitrogen gas has a wide variety of applications, including serving as an inert replacement for air where oxidation is undesirable;

To preserve the freshness of packaged or bulk foods (by delaying rancidity and other forms of oxidative damage)
In ordinary incandescent light bulbs as an inexpensive alternative to argon
On top of liquid explosives for safety measures
The production of electronic parts such as transistors, diodes, and integrated circuits
Dried and pressurized, as a dielectric gas for high voltage equipment
The manufacturing of stainless steel
Use in military aircraft fuel systems to reduce fire hazard, see inerting system
Filling automotive and aircraft tires[4] due to its inertness and lack of moisture or oxidative qualities, as opposed to air, though this is not necessary for consumer automobiles.[5][6]
Nitrogen molecules are less likely to escape from the inside of a tire compared with the traditional air mixture used. Air consists mostly of nitrogen and oxygen. Nitrogen molecules have a larger effective diameter than oxygen molecules and therefore diffuse through porous substances more slowly.[7]

A further example of its versatility is its use as a preferred alternative to carbon dioxide to pressurize kegs of some beers, particularly thicker stouts and Scottish and English ales, due to the smaller bubbles it produces, which make the dispensed beer smoother and headier. A modern application of a pressure sensitive nitrogen capsule known commonly as a "widget" now allows nitrogen charged beers to be packaged in cans and bottles.

Molecular nitrogen, a diatomic gas, is apt to dimerize into a linear four nitrogen long polymer. This is an important phenomenon for understanding high-voltage nitrogen dielectric switches because the process of polymerization can continue to lengthen the molecule to still longer lengths in the presence of an intense electric field. A nitrogen polymer fog is thereby created. The second virial coefficient of nitrogen also shows this effect as the compressibility of nitrogen gas is changed by the dimerization process at moderate and low temperatures.[citation needed]

Nitrogen tanks are also replacing carbon dioxide as the main power source for paintball guns. The downside is that nitrogen must be kept at higher pressure than CO2, making N2 tanks heavier and more expensive.
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Old 11-12-2007, 02:51 PM   #20
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I'm a bit confused by Pauls post.

Paul..are you saying there is enough of a benefit or there is not enough benefit to using nitrogen in tires on a car?
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