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Old 11-17-2007, 12:02 PM   #15
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Originally Posted by Ahab
Since our humidity levels can be as low as 3%, I don't need no stinken nitrogen.
Our Humidity level is at 75.7 right now and that is low for New Orleans. I just throw a couple of the little bags of desacant I find in the cheap Tools I buy at Harbor Freight in each tire, works great.
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Old 11-17-2007, 12:05 PM   #16
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OK>>>FOLKS...where have you been?????

It is standard practice for ALL tires to be filled with Nitrogen for the last few years. When I go to ANY local tire dealer in my area...they always fill the tires with nitrogen. ONE of the biggest benifits from nitrogen is the pressure in your tires does not change from hot to cold weather like plain ol air does. I don't know about where you live...but nitrogen is the used at every tire shop here. Maybe its because WE go from 109 degrees in summer to 20 below zero in winter...but its used here EVERYWHERE. AT NO EXTRA COST BY THE WAY.
I live in New Orleans and it is not used here, heck your lucky to find a station with a working air compressor. I feel so behind the times now, I am scard to put my truck or trailer on the road. BTW I purchased a spare tire and wheel for my trailer and it came from Dallas mounted and "aired" up so I don't think it is standard practice in Dallas either.
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Old 10-12-2008, 10:56 PM   #17
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Race car mechanics have been using nitrogen for years, mostly as a matter of convenience. A big cylinder of nitrogen is cheap and a lot more convenient than a gas powered air compressor when you are way off at the races.

This idea of nitrogen being superior to air, I believe started as a cock and bull story fed to reporters hanging around the pits.

Nitrogen expands at the same rate as air. So do all gases, according to Boyle's Law. Anyone who finds out different, will get the credit for overturning a 200 year old law of physics.

Moisture inside the tire does nothing, compared to the moisture, or lack of same, combined with UV radiation (sunshine) on the outside.

Nitrogen is great for filling tires but not worth paying extra for. Don't let any tire shop or garage tell you different.
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Old 10-13-2008, 09:13 AM   #18
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Putting bags of dessicant inside your tires does not remove the moisture from inside the tire it just binds it with the dessicant. The bags will throw the balance of your tires off.
They will never sit in the same place twice. When the tire rotates the bag will be held in place where ever it happens to be by the centrifical forces.
Al
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Old 10-13-2008, 09:24 AM   #19
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I disagree with part of what has been said. The biggest contributor to tire pressure change is the moisture contained in the compressed air. IF you can remove the moisture from the air, it will change pressure much more slowly. Something that I see tire stores touting is that the tire will not lose pressure over time, this is not true. A tire will lose 1-2 pounds of pressure per month, no matter what it is filled with.
What tire stores and others try to tell you is the oxygen will find its way out of microscopic cracks and gaps in the tires. This is true, but it also means the nitrogen will also find its way out of those same spots. If it didn't, tires would automatically fill with nitrogen just by the fill and loss process.
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Old 10-14-2008, 07:45 AM   #20
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The claim is that the nitrogen molecule is larger and does not escape as fast as air.
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Old 10-14-2008, 08:21 AM   #21
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If the nitrogen molecule is larger, wouldn't nitrogen tend to collect nearest the earth's surface due to it's higher molecular weight?

Then people that live up on the mountain top would be breathing more oxygen than those down in the valley.
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Old 10-14-2008, 08:24 AM   #22
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Terry, that makes sense.

Air is 78% nitrogen, 21% oxygen, .9% argon, .033% CO2 and other makeup really drops off after that. Oxygen is only slightly heavier than nitrogen; molecule size size is a much more complex issue but I'll bet on not much difference. Everybody sing now -- Nitrogen makes the cha-ching go around...
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Old 10-14-2008, 08:31 AM   #23
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Terry, that makes sense.

Air is 78% nitrogen, 21% oxygen, .9% argon, .033% CO2 and other makeup really drops off after that. Oxygen is only slightly heavier than nitrogen; molecule size size is a much more complex issue but I'll bet on not much difference. Everybody sing now -- Nitrogen makes the cha-ching go around...
Four times around on a tandem trailer.

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Old 10-14-2008, 02:03 PM   #24
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Airlines and nitrogen

On 31 Mar 1986 a Mexicana Airlines Boeing 727-200 crashed killing 166 passengers and crew.It was determined the aircraft crashed due to a blowout of one of the tires.The tire had ruptured fuel,hydraulic and electrical lines in the wheel well.
In Jun 1987 the FAA issued an Airworthiness Directive requiring large aircraft that had tires on wheels with brakes installed to be seviced with less than 5% oxygen by volume thus nitrogen-which will suppress any fire caused by overheated brakes that cause the tire pressure to increase untill the tire or wheel failes.
Since useing nitrogen the airlines found .
(1) More consistent tire pressures ( Tire pressures are checked daily)
(2) Reduced corrsion to allow wheels.
(3) Prevented iner liner rubber deterioration due to oxidation.
(4) Tires run cooler
(5) No moister to freeze at high altitude.

I do use nitrogen in ALL my tires.
I think it has become a green thing.(In europe I hear they use green valve caps on nitrogen filled tires)Some say with nitrogen tire inflation improvement can be noted in vehical handling with better steering,braking and reduced chance of blowouts,fuel savings and better tire life through better tire pressure retention and cooler running tires.Here in the HOT Southwest heat takes it tole on tires so cooler running tires are .
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Old 10-14-2008, 02:26 PM   #25
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It is great that the FAA regulates air content of tires used in aircraft that have landing and take off speeds in excess of 100 miles per hour.

However my bullit only sees the north side of 65 mph on a good day. I consider the nitro green thing an added pain that I choose out of. Costco offers the service and does put the green caps on the valve stems. However, when I go to the great out doors I have discovered a spanish phrase from locals in the South West .......

"We don't need no stinkin' green caps!"

Couple that to the lack of moisture around here (usually less than 10% relative humidity) in the air I breathe which gives my sinuses a fit. However that is a story for another thread.

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Old 10-15-2008, 10:25 AM   #26
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Jimmini, I'd be willing to bet you have those magnet gizzies on your fuel line too!
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Old 10-15-2008, 10:09 PM   #27
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When I bought new tires from Costco they gave me green valve caps, no charge.

Pat
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Old 10-15-2008, 11:50 PM   #28
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Little cans.

Hi, I'm still waiting for the little cans of nitrogen [16 oz.] to top off my tires while on the road so I don't mix nitrogen with ordinary air. Everytime you check your tires with a pressure guage you will lose a little bit of air/pressure and will need to refill it somehow. My vender couldn't answer that question; What do we do while on the road? Why don't they make "Run Flat" ST tires?
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