9KRDLIN

save hydrogen for the FCX

UMS Tuning

For a street car the other benefit is that the Nitrogen molecules are bigger and there is less air pressure loss over the course of time.

At least that is what i remember from my Discount Tire days


as for us track whores...the benefit for me was more stable temperatures...... my tire pressure didn't vary as much with nitrogen as it does with oxygen

Kyushin

[QUOTE=UMS Tuning,Sep 27 2010, 06:23 PM] For a street car the other benefit is that the Nitrogen molecules are bigger and there is less air pressure loss over the course of time.

At least that is what i remember from my Discount Tire days


as for us track whores...the benefit for me was more stable temperatures......

adrs2k

Joe your last statement is the reason race teams, and now some street cars use Nitrogen. It is ALL about the stable pressures!!! All tires function best at a certain temperature and pressure, whether it be out right grip, or least rolling resisitance (better mpg).

Trying to talk about molecule weight is rediculous, it is such a small immeasurable difference and is not why people put nitrogen in their tires.

I worked in racing for 7 years, we all used Nitrogen, why, because it was stable and easier to predict its rate of expansion based on ambient temperature, track temperature, and tire temperature. Nitrogen expands less, and is more constant than adding oxygen.

When using nitrogen in race tires, we had to deflate all the oxygen out of the tire, fill the tire with nitrogen, then purge the tire again, and refill with nitrogen. Trying to eliminate all oxygen from the tires. This is why you will see some wheel manufactureres using 2 valve stems. You use one valve stem to purge the air, and the other to fill with Nitrogen.

9KRDLIN

The more common use is for a TPMS, or Tire Pressure Monitor System.

averageJoe

Adam, do you mean standard atmospheric air when you mention oxygen? I imagine pure pressurized oxygen in a hot, spark inducing environment might produce a fireball destroying half of the car if a tire were to blow out on track.

And I agree, the molecular weights don't matter, and is not the reason pure n is used.

Any pure gas could be used, but h and o are not used for obvious fire inducing properties,(hindenburg), n is easily available and inert.

adrs2k

Yes sorry for not being more specific, atmospheric air!

averageJoe

Quick on the reply, I didn't even finish my spelling correction edit, lol

adrs2k

LOL, what can I say, this is more interesting than what is going on on my other monitor

watchdogd

So if one loses some nitrogen pressure and the replaces it with regular air going back to nitrogen later will not be a problem correct ?