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  #13  
Old 10-01-2011, 05:30 AM
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Re: Tire Inflation With Nitrogen

I have always used 78% nitrogen, never had any problems.
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Old 10-01-2011, 09:14 AM
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Re: Tire Inflation With Nitrogen

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Originally Posted by HammFist View Post
I have always used 78% nitrogen, never had any problems.
Ditto. I figure the 22% difference more than makes up for it by providing a far wider variety of places to top off the tires without having to go to the dealer.
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Old 10-01-2011, 10:37 PM
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Re: Tire Inflation With Nitrogen

My limited came with nitro filled tires and my new overland regular air. The regular air based off of the TPMS seems to be holding a more constant pressure than the nitro tires did. I won't waste money on something that is free.....at least for now it is.
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Old 10-02-2011, 12:03 AM
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Re: Tire Inflation With Nitrogen

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Originally Posted by Technosavant View Post
Ditto. I figure the 22% difference more than makes up for it by providing a far wider variety of places to top off the tires without having to go to the dealer.
It's actually less than that. Most places use Nitrogen generators and they typically put out 95% or so nitrogen. I read something from one of the tire manufactures a few weeks ago (goodyear or goodrich?) where they actually recommended that the nitrogen be kept around 93-95%.
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Old 10-02-2011, 01:28 AM
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Nitrogen should not fluctuate as much as regular air. It is way less sensitive to temperature changes which is why it is used in both helicopter and airplane tires which go thru much higher temp ranges than car tires do. Also nitrogen is a bigger molecule, so the gas shouldn't escape from the tire as easily. I have been trying to find a place local to me that fills with nitrogen so I can get my tires switched over.

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Old 10-02-2011, 05:26 AM
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Re: Tire Inflation With Nitrogen

Nitrogen molecule = 121 picometers. Oxygen molecule = 110 picometers. Not a big difference. The size of the molecule only matters if we're talking about escape through a hole, which isn't really how it works.

Aircraft go through temperature ranges during t/o+climb and descent+landing which are greater than what 99.9+% of all ground vehicles will EVER see throughout their ENTIRE lifespan. A range of up to +130F to -70F in a matter of a few minutes, plus the extremely rapid and intense heating of the tires as the plane touches down. A jet's tires are likely still quite cold from spending a few hours at 36,000 feet when suddenly sped up to 180kts under very heavy load and then immediately, partially used to slow the aircraft down to taxi speeds (yes, the brakes do the slowing, but it does cause more friction at the tire as well) in conjunction with reverse thrust on larger jets.

Also, a primary reason for nitrogen in aircraft tires is the lack of explosive potential. In cars, this is essentially a non-issue. In aircraft it's a very genuine concern. Reasons are mostly the temperature range issues, and partly related things like brake heat, wheel material (magnesium) corrosion/reactivity, and other things which don't matter to cars.

Aircraft have to worry about the extremely small possibility of a catastrophic failure potentially resulting from a tire problem on t/o or landing. Cars don't. Tire and wheel fires are a real thing that happens to aircraft. I'm talking about fires that actually start at the wheels/tires, not just them catching on fire from something else burning already. That has probably never, ever happened to a normal passenger vehicle (brake fires do happen to both, but aircraft brake fires a bit more problematic :P ).

There are even more reasons than I've mentioned for their use in aircraft tires, which, again, don't apply to passenger autos.

http://www.airliners.net/aviation-fo...ad.main/70358/


To summarize: If you want to have useful nitrogen in your tires, become a pilot and buy a plane. Otherwise, save your money. 78% nitrogen is fine for everyone else.
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Old 10-02-2011, 06:06 AM
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Re: Tire Inflation With Nitrogen

The reasoning behind using nitrogen is that it is less sensitive to temperature. This keeps the little tpms from pissing you off by always saying that you are always over/under inflated. With that said, for this to work as stated you must use 100% DRY Nitrogen. By using 100% dry nitrogen there are no condensables in the tire void, ie water vapor. Removing the condensables from the tire void will eliminate any worry of the wheel rotting from the inside out as well as stop any erratic TPMS behavior due to temperature related pressure swings. What many tire shops and dealerships don't understand is that you must purge the tire prior to filling it. Simply letting all the air out of the tire and re-inflating it with nitrogen will not give you the added benefits of using dry nitrogen. The proper procedure would be to deflate the tire, break the bead, purge with dry nitrogen while simultaneously setting the bead. Then proceed to fill to the manufactures recommended tire pressure. If these steps are followed the benefits of using dry nitrogen will be realized. By benefits I strictly mean the anti corrosion properties and the elimination of erratic TPMS behavior due to fluctuations in temperature. If these steps are not followed then one is just lining the dealer/tire shops pockets
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Old 10-02-2011, 07:26 AM
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Old 10-02-2011, 07:41 AM
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Re: Tire Inflation With Nitrogen

Bottom line here is the performance of Nitrogen. The first 4 years of ownership on my BMW I had regular air in my tires and every 1-2 months I was topping off the air to get it to where I wanted. When I went to Nitrogen the pressure has not changed in 4 years.
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Old 10-02-2011, 09:58 AM
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Re: Tire Inflation With Nitrogen

You can actually air them back up using a nitrogen cylinder from any HVAC supply house and a good regulator as well a a few adapters. One would incur a one time bottle fee of $200.00 and every subsequent "exchange" would cost $25.00. A bottle holds 2000 psig. I am just guessing here but I would assume that 1 bottle would be enough to air your tires back up after a day of wheeling.

Another use for a bottle of Nitrogen would be that in theory if the Air Compressor for the quadralift ever failed you could use the pressure in the bottle to raise the vehicle
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Old 10-02-2011, 10:35 AM
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Re: Tire Inflation With Nitrogen

I just did some quick math and a standard Nitrogen tank (aprox 44L @ 2000psig) would fill four 31x10.5x20 tires up from 0 psig to 65 psig. So in theory you would have more than enough nitrogen to fill a 31x10x18in rim with 32psig.
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  #24  
Old 10-02-2011, 11:02 AM
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