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Old 08-16-2013, 09:05 AM   #11
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Originally Posted by emtdave View Post
Nitrogen has better heat transfer properties than compressed air, no water vapor and on a molecular level the molecules are slightly larger and therefore less prone to leakage thru a tire membrane.
That's true. My 2604WS came with N-filled tires and have held their correct pressure.
I'll offer this as anecdotal evidence: My friend has a GMC van he uses as a TV. It has a set of high-load-range tires that require 80psi. He was constantly annoyed by having to find an air pump at a gas station that would go that high. He doesn't always travel interstates so truck stops weren't an option. He switched to N and hasn't topped up the tires in two years.

Jus' sayin,'
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Old 08-16-2013, 12:40 PM   #12
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Quote:
Originally Posted by awellis3 View Post
That's true. My 2604WS came with N-filled tires and have held their correct pressure.
I'll offer this as anecdotal evidence: My friend has a GMC van he uses as a TV. It has a set of high-load-range tires that require 80psi. He was constantly annoyed by having to find an air pump at a gas station that would go that high. He doesn't always travel interstates so truck stops weren't an option. He switched to N and hasn't topped up the tires in two years.

Jus' sayin,'
Teach
Let's assume for a minute that it's true that nitrogen molecules leak out more slowly. So you put air (78% N) into your tires. After a while, the 22% molecules have leaked out so your tire is 22% low on pressure, but it's pure N. You top it off with air and now that small percentage of non-N leaks out again. As you can see, after a few loops they this process, your tire is nearly pure-N and the pressure stays constant.
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Old 08-16-2013, 01:23 PM   #13
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A couple comments about this subject:

1. Do a search here regarding nitro filled tires, there's plenty of discussion and pros and cons ( mostly cons), I started the thread last year after we brought our FW and I had a flat on a nitro filled tire and the subsequent difficulty finding a place that had nitro.

2. I personally put the recommendation of keeping your RV tires serviced with nitro in the same category of those TV info commercials telling you how to get rich in the real estate market - just pure bunk.

3. After a series of fires occurring from overheated brakes in large aircraft that were partly fed by oxygen in the tire and magnesium in the wheels, the FAA made it mandatory that the tires on these aircraft be serviced with nitro to prevent any fire from spreading if the brake (s) overheated. This rule has been in effect for several years now.

To me, that is the only benefit I see from using nitro to service tires.
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Old 08-16-2013, 01:30 PM   #14
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My tire guy, a good friend, put 'em in my truck, and they came in the trailer....nitro that is.

He said the advantage is that they don't have flat spots when cold like air does. Other than that, nothing.
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Old 08-16-2013, 01:41 PM   #15
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Originally Posted by BandJCarm View Post
My tire guy, a good friend, put 'em in my truck, and they came in the trailer....nitro that is.

He said the advantage is that they don't have flat spots when cold like air does. Other than that, nothing.
Oh My!!! That's a "whopper" of a claim.
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Old 08-17-2013, 07:02 AM   #16
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Yep!
Save the money!
Use the money you will save and buy an onboard compressor for the truck and never need to look for a circle k for air ever again!
That's what I did and I put the filtered air input tube inside the cab of the truck so, if I am running the AC, the moisture content of the air will be lower and cooler than the outside ambient air. I love having the on board compressor. Especially since my camper tires need 110 PSI. My home 120 PSI compressor didn't have the guts to air up my camper tires or the air bag on my hitch.
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Old 08-17-2013, 08:10 AM   #17
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Consumer Reports mag says it doesn't matter.
Like others here have said- atmosphere is 78% nitrogen anyway.

Be sure and winterize the air in them every fall.....
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Old 08-17-2013, 08:41 AM   #18
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Gimmick to increase tire dealership profit.

One born every minute:

Do Nitrogen-Filled Tires Enhance Fuel-Efficiency?: Scientific American
Attached Files
File Type: pdf N2 debate molecule size graham.pdf (76.1 KB, 18 views)
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Old 08-17-2013, 12:28 PM   #19
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B47:

I was in the landing gear and brakes group at Boeing for several years. I did a lot of research into tire bursts.

The accident with the magnesium wheels was a Swissair Caravelle. There were 69 fatalities. Magnesium alloy wheels were banned on passenger airplanes after that, as was the Mil-H-5606 hydraulic fluid.

Boeing had an in-flight tire burst on a 727 that punched a 15" or so hole in the wheel-well aft bulkhead. The tire bead had failed in tension, which we calculated would have taken an instantaneous pressure in the tire of about 12,000 psi. We figured that a dragging brake during taxi and take-off had caused gases in the tire material to mix with the inflation air and a spontaneous explosion caused the burst after the gear was retracted. There have been several others, including a USAF Galaxy, but none since nitrogen was made a requirement.

Conclusion - if your RV can accelerate to 150 mph in two miles with a dragging brake, and then you put the wheels in a closed box, inflate your tires with nitrogen. If not, save your money!
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Old 08-17-2013, 04:22 PM   #20
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Originally Posted by F and E Damp View Post
B47:

I was in the landing gear and brakes group at Boeing for several years. I did a lot of research into tire bursts.

The accident with the magnesium wheels was a Swissair Caravelle. There were 69 fatalities. Magnesium alloy wheels were banned on passenger airplanes after that, as was the Mil-H-5606 hydraulic fluid.

Boeing had an in-flight tire burst on a 727 that punched a 15" or so hole in the wheel-well aft bulkhead. The tire bead had failed in tension, which we calculated would have taken an instantaneous pressure in the tire of about 12,000 psi. We figured that a dragging brake during taxi and take-off had caused gases in the tire material to mix with the inflation air and a spontaneous explosion caused the burst after the gear was retracted. There have been several others, including a USAF Galaxy, but none since nitrogen was made a requirement.

Conclusion - if your RV can accelerate to 150 mph in two miles with a dragging brake, and then you put the wheels in a closed box, inflate your tires with nitrogen. If not, save your money!
Yep - the Airworthiness Directive (AD) number is 87-08-09 and was effective 06-01-87.
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