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Old 07-05-2010, 02:14 PM   #1
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Nitrogen vs. Air in your tires

Moderator: I am not sure where this post should be, if you want to change it to a better category its OK by me.
Below is what I saw in the automotive section of recent issue of a Salt Lake City, UT newspaper.
“Get Nitrocized for free at XXXXXX” (with purchase of a car from XXXXXX)
“Nitrocize Package- We replace the air in your tires with nitrogen!”
· “increases fuel economy by up to 10%”
· “increases tire life by 30% or more
· “decreases activation of your Tire Pressure Monitoring System”
What does the above advertisement mean?
How can nitrogen increase fuel mileage? (Notice; “up to”)
How can nitrogen increase tire life? (Notice; “increases tire life by 30% or more”)
My 1955 edition of “Machinery’s Handbook” and what little I remember about basic chemistry is that air is composed of; Nitrogen-78%, Oxygen- 21% and Argon- 1%.
I always thought that race cars used Nitrogen in their tires because of the moisture (water vapor) contained in standard compressed air as well as the high temperature they operate at.
Richard
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Old 07-05-2010, 02:45 PM   #2
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Rich, I bought a used MH this spring and previous owner had nitrogen in tires. My research indicates a little better mileage, delays tire age from sunlight and runs at cooler temp. The only thing I noticed is air pressure has stayed the same for 5 months and I swear from touch after hundreds of miles on the road the tires do not fell hot, probably luke warm (subjective judgement on my part). For whatever its worth, I'm keeping nitrogen in the tires
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Old 07-05-2010, 04:24 PM   #3
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FWIW I have had nitrogen in my toad. Some assumptions must be made in the above stated claims. One is that the operator does not compensate for ambient temperature changes. My unanswered question is, should we use the standard tire chart with Nitrogen? Should we increase the recommended pressure when using nitrogen to compensate for the lack of pressure rise? I would guess the proper tire sidewall profile is according to PSI not nitrogen!
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Old 07-05-2010, 04:31 PM   #4
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Is Flagelplater's concern valid during the winter?
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Old 07-05-2010, 04:39 PM   #5
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FWIW The PSI indication on my toad remains steady for winter driving as well as summer driving. It would only shift 1 or 2 PSI from 32 as a set pressure.
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Old 07-05-2010, 04:50 PM   #6
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Do you monitor the toad TP when your driving the toad?
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Old 07-05-2010, 05:18 PM   #7
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I have yes. If we take a long trip in the toad I will move the monitor, but normally I leave the monitor part in the coach.
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Old 07-05-2010, 05:21 PM   #8
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Air is mainly nitrogen. There is absolutely no benefit to be had from paying to have your tires purged and refilled with nitrogen, other than to the tire salesman that conned you into doing it.

When I worked at Boeing, I was involved in analysiing in-flight tire bursts. based on about 20 or so serious incidnets, the airline industry switched from air to nitrogen. The incidents were almost all the result of dragging brakes on takeoff causing high temperatures in the wheels and tires which then "cooked" the tires when the gear was retracted. Volatile compounds were released into the tire's air volume and spontaneous combustion caused the tire to explode.

If your RV can get up to 150 mph with a dragging brake, nitrogen inflation might help avoid a tire explosion. If you can't get going that fast, don't waste your money!


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Old 07-05-2010, 05:30 PM   #9
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When tires are mounted are steel wheels is not the oxygen taken up as iron oxide?
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Old 07-05-2010, 05:36 PM   #10
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I am of the club that nitrogen is not worth the cost or effort. If you have a airplane or race car, it would be worth the effort.

Ken
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Old 07-05-2010, 05:42 PM   #11
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FWIW I too, in a prior life, was involved with the aviation industry. We also used nitrogen it helicopters, even little puddle jumpers, that never had a dragging brake problem or attained a high speed. It was to insure that moisture was not injected into the tire. I also agree that I would Not pay, more than a dollar or two, for nitrogen, mostly because I monitor my tire pressure very close. It is very nice though when you drive from the frigid North to warm South and your PSI check every morning remains the same. No adjustments needed! Still wondering about the Tire Chart question though.
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Old 07-05-2010, 05:46 PM   #12
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So then Flagelplater, how does that jive with your previous concern?
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Old 07-05-2010, 05:56 PM   #13
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TandW Sorry. I don't follow your question.
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Old 07-05-2010, 06:05 PM   #14
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I am sorry. I just figured that based on your own seasonal observations you had satisfied your concerns about running pressures. You don't want to carry your static pressure above what is prescribed, do you?
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