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YOUR RESEARCHNitrogen v O2
Leading reported evidence
Check on an aircraft walk-around has a tire pressure gauge
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Suggestion
Every tire I check on an aircraft walk-around has a tire pressure gauge.
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Suggestion
But, unless you're always going to go back to the same place to fill your tires, or keep a tank at home, it makes little sense to start putting it in.
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Suggestion
As the O2 becomes rust, (FeO2) the water rises into the inverted test tube.
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Suggestion
Remember that iron filing experiment with a test tube inverted under water.
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Suggestion
You can do even better by using an air drying system.
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rrys is right-aircraft tires use nitrogen because it is inert (don't want oxygen combining with sparks around maybe a ruptured hose if a tire blows on landing or take-off).
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Found a new shop today in WLA, Lucent Motors and they have a Nitrogen machine thats fills your tires with Nitrogen instead of air. Has anyone heard of this before? They said it is better than air because it does not leak and is not affected by the elements like heat and cold. The owner apparently was the former head installer at CEC.
Any thoughts.
Oh, a science question. I think the main advantage is that N2 is inert and O2 can react. Remember that iron filing experiment with a test tube inverted under water. As the O2 becomes rust, (FeO2) the water rises into the inverted test tube. It is well known that ozone O3 damages rubber, and N2 should be free of ozone where air has a trace, but that trace is then pressurized so that it's impact (partial pressure) on the inside of the tire is some 3-4 times the impact on the outside. Also, N2 should be drier. N2 is technically lighter than air, but I calculate that one tire contains about 1.4 cubic feet. The N2 weighs some 0.310 lbs and Air (79% N2) weighs some 0.318 lbs. 8 thousanths of a pound! not a strategic advantage. As far as leaks I cannot imagine how N2 would help. Also, N2 and O2 expand virtually identical with heat and cold and follow the famous "Ideal Gas Law". Well, Famous in some circles. To go from freezing to 100 DEGF would add some 7 or 8 psi if the tire volume stayed the same, but as the tire likely stretches too, the temperature effect would be less. Yeah, N2 would be better than air, but not the number 1 upgrade.
Also, if pressure went low, how could you refill it? go back to the shop?
Since air is mostly N2 anyways, I don't see any advantage to this.
And the claim about N2 not leaking is blatently false. N2 will react like any other gas in regards to a leak.
rrys is right-aircraft tires use nitrogen because it is inert (don't want oxygen combining with sparks around maybe a ruptured hose if a tire blows on landing or take-off). Racers use it because tank-supplied gas is dryer than air-compressor gas, which means less tire pressure and temperature variation at the track. You can do even better by using an air drying system.
My understanding is the smae as Jay's. Notice how much moisture winds up on whatever tool you use to bleed an overinflated tire. All that water in a hot tire is vapor which significantly increases pressure from cold to hot tires. The stuff about no leaking is BS, since atmospheric concentrations of N2 are 80%, so compressed room air shouldn't leak either. But, unless you're always going to go back to the same place to fill your tires, or keep a tank at home, it makes little sense to start putting it in. AS
Jay and Alexander bring up a good point with the moisture. Maybe this is the basis for the claim that N2 has a more stable pressure than air. Some air compressor systems can get slugs of water into the air, and pumping this water into your tire is not a good thing. As a tire with water heats up, some of the water will evaporate and raise the pressure in the tire. If the tire were heated to 212 DegF (a bit extreme) and some liquid water still remained, then this would add some 14.7 psi compared to a tire with dry air heated to 212.
Water Slugs can form when the air piping is colder than the receiver and water condenses into low spots in the piping. Air systems should have a water drain on the receiver and a filter/water trap just before the step down regulator. When I set up my compressor I put it in the cool cellar and piped it up to the garage. The cooler the air in the receiver and the higher the receiver pressure the less moisture will be in the air supply.
As of this weekend I am now a RennList member.
