Nitrogen Vs. Regular Air - Jeep Commander Forums: Jeep Commander Forum
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post #1 of 20 (permalink) Old 06-03-2009, 07:06 AM Thread Starter
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Nitrogen Vs. Regular Air

While getting my oil changed this morning at Jeep they said they recommend people to start putting Nitrogen in the tires instead of regular air for better gas mileage etc. Anyone have any information about putting Nitrogen in the tires? Did a search and could not find anything about this.
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post #2 of 20 (permalink) Old 06-03-2009, 07:14 AM
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I have heard of lots of places doing Nitrogen inflation but I don't know the advantage to it. Maybe it is lighter than air? or maybe it helps preserve the rubber from the inside out?

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post #3 of 20 (permalink) Old 06-03-2009, 07:42 AM
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Every car we get from the factories here has the air let out and Nitrogen put in. The nitrogen molecule is larger than a regular air molecule and does not escape through the rubber as easily. It also does not expand after warming up like air does and helps to keep the tires cool and under proper inflation.


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post #4 of 20 (permalink) Old 06-03-2009, 07:49 AM
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I will try to keep this short and understandable,

Nitrogen is a good substitute for air only in specific situations.
Generally it is used in racing applications because the pressure won't rise when the tire is at operating temp.
So, if the right front is best at 37.3 psi and the left front is best at 34.7 psi etc. you can set those pressures at the start of a race and they will not change.
This way, the car will handle as anticipated once the rubber is up to temperature and not change as the tire gets hotter.
However, it is a LOUSY way for service shops to make money.
A street vehicle has a cold tire pressure specification, and for this discussion, lets use 35 psi as cold pressure.
Remember to check pressure monthly as cold means ambient temp.
Anyways, the tire maker has determined that by setting the correct cold pressure, the tire pressure will increase as the tire reaches operating temp.
Air in the tire will increase 1psi for every seven degrees above ambient.
So, we begin our trip at 80 degrees and our 35 psi ambient tire is operating at about 150 degrees in 15 minutes.
OK lets see what goes on here: Since the temp has increased by 70 degrees we divide that by 7 which means our operating pressure has increased to 45 psi.
This is anticipated by the tire manufacturer and is the pressure that will provide the best handling and tread life for this application at that ambient temp.
Now, if we were to have nitrogen in the tire our starting pressure and our operating pressure will not change.
Not good, we will actually be operating underinflated at 35 psi hot.
This will actually cause the tire to run hotter due to increased carcass flexing and will actually cause increased wear because the tread rubber will be softer due to that heat.
So, once you cut through the hype, you see it is a scam against the uninformed.
Quite simply, good for racing application, bad for daily application.
Questions?

Rob


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Last edited by robby; 06-03-2009 at 10:13 AM.
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post #5 of 20 (permalink) Old 06-03-2009, 09:11 AM
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that gave me tired head!

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post #6 of 20 (permalink) Old 06-03-2009, 09:34 AM
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Quote:
Originally Posted by Ranger6882 View Post
that gave me tired head!
Too much nitrogen and not enough oxygen.

Air is a mixture of gases - 78% nitrogen and 21% oxygen - with traces of water vapor, carbon dioxide, argon, and various other components.

Hmm. So if the smaller molecules leak out faster, then eventually your nitrogen content will go up in the tires as you add air to repressurize.
Which is bad because it won't warm up enough to gain appropriate pressure. Maybe I better go out and change the air in my tires.

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post #7 of 20 (permalink) Old 06-03-2009, 09:46 AM
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I had this service tech years ago working for me, his van had a flat so he decides to inflate tire with freon. He got a few miles down the round until tire exploded.

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post #8 of 20 (permalink) Old 06-03-2009, 09:53 AM
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When I was in the service department at the dealer a few weeks ago they had a display promoting nitrogen for your tires. The cost was about $49.00 as I recall and they were giving away a free road service program of some type with it.

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post #9 of 20 (permalink) Old 06-03-2009, 09:55 AM
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Quote:
Originally Posted by Ranger6882 View Post
I had this service tech years ago working for me, his van had a flat so he decides to inflate tire with freon. He got a few miles down the round until tire exploded.
WOW.........

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post #10 of 20 (permalink) Old 06-03-2009, 02:50 PM
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What exactly is the "cold" temp that manufacturers expect you to fill at? 80? This winter I filled to about 37psi (tires rated at 44), and now when I cruise down the interstate they hit 45+psi. How much over the rating is too much?

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