If at sea level I removed the valve stem from a tire ,the air inside would equalize at one atmosphere .Replace valve stem and brought tire up to 33 pounds with nitrogen , contents would be 50 percent natural air and 50 percent nitrogen , Why 33 lbs , as I understand it one atmosphere equals 33 lbs. Maybe I am mixing apples and oranges . Continuing , I bring tire up to 66 lbs , operating pressure for this tire . Tire now is one third air and two thirds nitrogen . I can never improve this mixture with out a vacuum pump , nearly impossible because of sidewall collapse . How far off base am I , I ain't no science wiz .

Well Bob, I think, you are over thinking this!It is my understanding, that "natural air", has a high percentage of nitrogen, about 80 percent, to begin with.I don't know why you would feel the need to be 100 percent nitrogen on an RV tire, but I think if you let existing air out of your tire, added pure nitrogen from a suitable source, that would be as good as it gets.Jerry

78.09 % nitrogen (known as air) is good ebough for me,

I carry a small nitrogen tank and pressure regulator in my RV and use it in lieu of a air compressor. I've found the tank will meet all my needs for a year or so and then I purchase a fresh tank at a welding supply for $15-$17. I like it so much better than that wimpy air compressor I had, plus if I need to rent an air impact wrench to break a few nuts free it'll give me more than enough pressure for my needs.Steve

You are kinda missing my point , maybe . Unless you use a vacuum pump you ain't never gonna get close to having a " perfect nitrogen filled environment " Did I say it correct ? Even at 110 lbs you will still have left in the tire one fourth of one atmosphere of plain ole everday air . I wonder if airplanes and race cars evacuate a tire before nitrogen . Maybe I have been sniffing to much glue , I do not have any glue so I use my granddaughters paste .

On that note, we just recently bought my son a new car. It was amazing how many dealers were charging $199 for nitrogen filled tires. It was an "add-on". Needless to say, I told them to not even consider that junk as we were bargaining. What a crock.

Not nitrogen , again ! | Good Sam Community

wearenh
Explorer
Aug 08, 2016
wanderingbob wrote:
...I can get 33 feet in a tire of nitrogen at sea level...

you must have really really big tires, how do they fit under your rig??
wanderingbob
Explorer II
Aug 08, 2016
I am The OP . I think that I will get a hobby , I am gonna study gun laws , concealed carry . Lots of work there to be done !!!
austinjenna
Explorer
Aug 08, 2016
After reading these posts. It appears to me some of you guys need to get a hobby.I guess I don't think a lot about the air in my tires, if they are not flat, I'm in good shape. But I did get a chuckle from the posts.

X2
drsteve
Explorer
Aug 07, 2016
For race car tires, nitrogen has clear advantages, such as better pressure stability due to less moisture content. For normal driving, well... not so much.

Nitrogen
Old-Biscuit
Explorer III
Aug 07, 2016
Dtank wrote:
Strabo wrote:
I change the air in my tires, and have them rotated so the letters on the sidewall standup when i come to a stop. ;)

I tried that but the darn tire lettering wouldn't line up when I got
it home.

Also did the helium thing, but found it had too much "float", and I
was losing traction on steep hills with no load in the pickup bed.

BTW - the folks carrying small nitrogen tanks -vs- a compressor, should look into C02.

Go to Power Tank- then make your own.
Off roaders and RVers been using C02 for a looooong time!

Fill at: Paint ball stores, home brew stores, welding supply, etc.
Expansion ratio of C02 liquid to a gas is 450 to one.

.

$350 for a Power Tank 10lb basic set up

My 12V DC compressor didn't cost that much and has never needed refilling in 8 yrs. Plus it doesn't take up as much room
Old-Biscuit
Explorer III
Aug 07, 2016
Turtle n Peeps wrote:
No, you're not correct.
You don't need a vacuum pump to get 99% N into a tire.

Here's how you do it. Get as much air out of the tire as you can without blowing the bead off. Put the valve stem back in and fill with N.

Bleed all of the air/N out of the tire.

Fill with N again.

Bleed all of the air/N out of the tire.

Fill with N again.

Each time you do this you get a higher concentration of N into the tire. After about 3 or 4 times you have "pretty much" 100% N in the tire.

Purging.......

That's why dealers charge for Nitrogen filled tires...to cover cost of all that nitrogen being purged.

If they are not purging then they would be charging for services not preformed and a dealer wouldn't do that!
dave54
Nomad
Aug 07, 2016
Strabo wrote:
I change the air in my tires, and have them rotated so the letters on the sidewall standup when i come to a stop. ;)

I tried that. I looked at the tire sidewall in my extended mirrors and the writing was backward. I had to shift into reverse to read the sidewall lettering.
Dtank
Explorer
Aug 07, 2016
Strabo wrote:
I change the air in my tires, and have them rotated so the letters on the sidewall standup when i come to a stop. ;)

I tried that but the darn tire lettering wouldn't line up when I got
it home.

Also did the helium thing, but found it had too much "float", and I
was losing traction on steep hills with no load in the pickup bed.

BTW - the folks carrying small nitrogen tanks -vs- a compressor, should look into C02.

Go to Power Tank- then make your own.
Off roaders and RVers been using C02 for a looooong time!

Fill at: Paint ball stores, home brew stores, welding supply, etc.
Expansion ratio of C02 liquid to a gas is 450 to one.

.
Strabo
Explorer
Aug 07, 2016
I change the air in my tires, and have them rotated so the letters on the sidewall standup when i come to a stop. ;)
JWRoberts
Explorer
Aug 06, 2016
dave54 wrote:
I use helium. My truck just seems to float down the highway.

LOL.....

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Not nitrogen , again !

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