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The place i'm going to get my new wheels/tires from puts NITROGEN in the tires for free..... I've never heard of doing this, so if someone can fill me in as to whats the purpose of this? and should i get it? I did do a search for NITROGEN and nothing came up.... Thanks
 

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its supposed to make the tires stay inflated longer, but idk if you knew this but the air you breath is like 91% nitrogen
 
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Nitrogen is less proned to expand and contract due to temperature changes.

Therefore, your tires will stay closer to its optimum tire pressure when it gets hella cold or when it gets hella hot.

It's a good thing, just go with it.
 

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also nitrogen will have less moisture so if you have steel rims they will be less likely to rust.
 
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smc1377 said:
Nitrogen is less proned to expand and contract due to temperature changes.
Technically, yes... but the expansion/contraction difference between 80 and 100% Nitrogen is too miniscule to notice. ...and it's not like they evacuate the tire prior to filling, that leaves 1 tire volume of 'air'.

Race teams took to using bottled gas rather than lugging a compressor everywhere (and the associated maintenance). Bottled gas is dry and a 'T' bottle of Nitrogen is pretty cheap and goes a long way too.

There was a long debate about this @ www.eng-tips.com The final outcome was that the advantage is really in it's ease of use. There's no real calculable benefit in the tires.
 

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There are a lot of tire places that use machines that actually do evacuate the air from the tire before they fill it with nitrogen, this is why at those places you pay $80 to get it done. If they evacuate the air and whatnot you should get better gas mileage but I'm not an expert on it.
 

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My problem with paying for nitrogen is when you need a fill up. If I have a compressor at home. Do I stop using this to fill my tires and pay every time the tires get low?

However,
"Nitrogen is denser than Oxygen: This means the larger molecules escape less easily from tires resulting in a more gradual loss of pressure over time. According to a Michelin Tire Manual, a tire that is inflated with Nitrogen loses its pressure 3 times slower than if it were inflated with air.
Nitrogen provides longer tire life: Nitrogen inflated tire run cooler and require less maintenance according to a Goodyear application bulletin."
 

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And when you get bored you can fill up a balloon with the nitrogen in your tires and have a good time(I wouldn't really do this unless you don't have a need for your brain cells).
 

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Dudley said:
However,
"Nitrogen is denser than Oxygen: This means the larger molecules escape less easily from tires resulting in a more gradual loss of pressure over time. ."
You got that backwards. The denser a material is , the smaller are the molecules, wich in the case of metals (much denser that air) they're single atoms. I think this is just another hype wich will wear off . As it was stated earlier there's no real advantage other than being practical or convenient.
I would never pay 80 shells to get my tires filled with something that's free for everyone to use in the atmosphere, that's just ridiculous, just like the gains they claim. This is just one of those marketing scams like the Vortex, Electrical superchargers, Magnetic fuel atomizers that you clip on your fuel lines ......Puhhhlease give me a break...
 

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popimp said:
And when you get bored you can fill up a balloon with the nitrogen in your tires and have a good time(I wouldn't really do this unless you don't have a need for your brain cells).
Nitrogen is inert, breathe it all you like (you may be thinking of Nitrous-Oxide).
Don't forget, you're breathing 80% Nitrogen right now !!

Terminator's right too, denser gas means smaller molecules.
Dudley said:
According to a Michelin Tire Manual, a tire that is inflated with Nitrogen loses its pressure 3 times slower than if it were inflated with air.
Is there an online source for that ?? Hmmm a 25% increase in Nitrogen = 300% performance increase ?? (might be time to invest in a Hydrogen Booster).

If Oxygen so freely spews out of your tires, wouldn't you be left with pure Nitrogen after a few top ups ?

No-one's mentioned yet, the tires oxidizing and rotting from the inside out. Inert gas would prevent this (if it were a realistic threat).

A group of engineers went at this problem from all angles and couldn't find ANY benefit to the end-user. As a matter of fact, I went back to trace the conversation and found the thread deleted (no scientific substance).
 

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Gorm said:
Isn't this a mythbusters topic?
Not sure if they've ever done it but it's been posted on their forum. Arguing science with ten year olds is only fun for a few minutes, then they call you Mr. Stupid Head.

Oooh, and Nitrogen is fire-proof too !!

From http://www.eng-tips.com/viewthread.cfm?qid=168616&page=1

"Patprimmer:
For crying out loud, how many times do we have to do this.

The answer was and still is clear. Snake oil salesmen publish false data to sell a product. They then charge very high prices for it. Some even believe their own garbage, or honestly repeat someone else's garbage.

When it contradicts known science, only believe it when you see the results of significant sample size, randomly selected sampled, double blind tests done by a respectable neutral party.

This seemingly has some scientific merit as some of the claims have some support in theory, BUT the effects in the real world are insignificant in all but the most extreme conditions of use.

Normal new tyres do not fail from oxidation in any normal use.

Normal rims and valves do not leak due to corrosion caused by water in the tyre.

Water does permeate through rubber and reach equilibrium, so the nitrogen filled tyres do not stay dry for long.

Nitrogen filled tyres are not normally purged of all air before the final fill.

0.25 psi only makes a detectable difference in drag racing, and there tyres are checked seconds before each run, which only lasts seconds, and a pressure build up after about half track probably helps slightly.

If you are circuit racing, you set the pressures for best performance when hot. If the pressure builds 0.25 psi from heat, you just start out 0.25 psi lower to get the correct running temperature.

Big rigs, same deal as circuit race cars. Set tyres for optimum performance when hot.

Conclusion. SNAKE OIL.

Have I missed anything.



Regards

eng-tips, by professional engineers for professional engineers"
 
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