Nitrogen Tire Fill?

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Sep 7, 2005 | 02:53 PM

#31

Drifter K

Newbie

Joined: Nov 2003

Posts: 37

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From: Denver, PA

It would be pretty cool to see tires bursting into flames. If only it could be ignited.

Sep 7, 2005 | 03:20 PM

#32

05 Silver RA

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Joined: Apr 2005

Posts: 62

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From: Atlanta, GA

actually, i think it might be pretty hot!

lol

Sep 8, 2005 | 04:53 AM

#33

djh

Evolving Member

Joined: Apr 2004

Posts: 400

Likes: 1

From: Columbus, OH

Quote:

Originally Posted by kmcconn9

The biggest reason to use compressed nitrogen *in a racing tire* is that it's dry, compared to typical compressed air.

Right answer.

Quote:

When a tire heats up, the air and any moisture inside it heats up as well. When the moisture inside the tire heats up, the water molecules move further apart, increasing the tire pressure. By removing this moisture, the pressure stays more consistent over the entire heat cycle of the tire.

Sort-of wrong reason. All gases expand when you heat them and the pressure increase is linear with respect to absolute temperature. The problem with water is that it condenses. Then when it gets hot it evaporates and the pressure change is much greater and non-linear.

Dave

Sep 8, 2005 | 04:59 AM

#34

kmcconn9

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Joined: Jun 2005

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From: Hagerstown

seems to be just like what I said but using different terms...either way we are both right..

not worth it for a street car..

Sep 8, 2005 | 05:05 AM

#35

djh

Evolving Member

Joined: Apr 2004

Posts: 400

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From: Columbus, OH

Quote:

Originally Posted by wingless

Air = 78% nitrogen, 18% 0xygen, the rest is co2 (IIRC)

You're OK on N2 but O2 is closer to 21%. Suprisingly Argon (Ar) is the next biggest component, at about 1% (it comes from the decay of radioactive potassium). CO2 is present at very low levels, typically less than 0.05%. On a hot, humid day water can make up several per cent, with everything else reduced proportionately. You can see the effect of humidity changes in OBD-II short-term fuel trims.

Dave