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Old 09-21-2010, 10:24 AM   #11
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We put some new Nokians on our Audi a couple of years ago and they filled them with nitrogen for "free". I honestly can't see any benefit. I have to think it is a another profit center for the tire shops.
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Old 09-21-2010, 12:09 PM   #12
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Moisture is the key. Nitrogen generators fill a tank with dry gas. You can dry your gas at home too if you put a filter on your compressor.
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Old 09-21-2010, 12:37 PM   #13
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I am an FAA licnsed Aircraft Technician (over 20 years) and I am now currentlty a Supervisor of Quality Control. We use ONLY Nitrogen in aircraft tires for a very good reason, no expansion or contraction with heat/cold. and no moisture will form inside the tire.

I would use it if it was more readily available and not a hassle to get it.
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Old 09-21-2010, 01:36 PM   #14
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Yeah, I heard that notion that tire pressure doesn't vary with temps. However, last winter it hit 20 below zero here, and one of the Nokians on our Audi lost its seal against the bead and went flat. No punctures. I can only assume that the temp DID affect the tire pressure to the point that it lost its seal. So, I'm not so sure I buy into that notion.
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Old 09-21-2010, 01:59 PM   #15
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You may have had a bad bead seat on your rim/some debris in the bead, etc. and this would cause the problem you are referring to. The tire did not loose the pressure because it was inflated with N2, you most likely had another problem that lead to the pressure release. Also your rims will expand and contract with temp changes, -20 below zero can cause strange things to happen..
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Old 09-21-2010, 02:13 PM   #16
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Nitrogen does follow the ideal gas law. Pressure variations will occur with varying temperature.
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Old 09-29-2010, 10:28 PM   #17
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Nitrogen does follow the ideal gas law. Pressure variations will occur with varying temperature.

Yes it does! I see it every day in aircraft tires. If you service them up to spec'd PSI at 0700 after they have been outside all night on a ramp that is 30F you will have an overserviced tire when that plane comes back at 1400 when it is 72F outside. And after many TOGAS that tire WILL grow by a decent amount as well, fresh rub marks on gear doors will attest to that.
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Old 09-30-2010, 06:37 AM   #18
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Pull your RV down Pit road at a NASCAR race,they all use N2,tell them Tony or Jeff sent you!
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Old 09-30-2010, 08:43 AM   #19
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"I am an FAA licnsed Aircraft Technician (over 20 years) and I am now currentlty a Supervisor of Quality Control. We use ONLY Nitrogen in aircraft tires for a very good reason, no expansion or contraction with heat/cold."
=============
Is this a reflection on what is wrong with the FAA?
All gases react to temp.
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Old 09-30-2010, 10:14 AM   #20
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Guys, were are talking trailer tires. The maximum speed rating for ST tires are 65 mph......not 200 mph like a Nascar COT, with tires continually scrubbing the pavement near their limits, and hot brakes heating them up even more . And the most elevation change a trailer tire will experience will probably be around 5000'........not 30,000'+ that an airplane experiences.

I watch my TPMS while going down the road, and on a hot day I can watch the pressure climb to 57 lbs. from the cold fill @ 50 lbs. The tires are made for this fluctuation.......that is why a maximum cold inflation pressure is stated on the sidewall.

A question for the aircraft personnel: Do you have a method for confirming 100% N2 in the tires ?? The way I understand N2 fills that only 95% can usually be obtained with ground based tires, as there will always be air in the tire to start with.

I have been a N2 tire fill naysayer, but I am always open to learn more. Right now, I don't see where a 15% gain in nitrogen in a trailer tire is worth the cost.
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