Not nitrogen , again !

[wanderingbob]

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 .

[wearenh]

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]

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]

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]

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]

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]

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]

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]

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]

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]

dave54 wrote:
I use helium. My truck just seems to float down the highway.

LOL.....

[Turtle_n_Peeps]

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.

[BCSnob]

I'll bet you'll find a tire pressure gauge measures the pressure differential between inside and outside the tire; otherwise one could use a tire pressure gauge to measure barometric pressure.

[2oldman]

wanderingbob wrote:
Goggle (sic) sez one atmosphere is a column of water 33 feet high , as a former SCUBA instructor 33 feet equals one atmosphere

I had to look hard to find that.. and really didn't. I was simply stating its PSI measurement. A deflated tire would have 14.3 psi.

I do seem to remember you had to descend to 33 feet to equal one atmosphere.. aka 14psi. Or maybe that was 14 + 14 at 33 feet?

Ah heck, maybe I should mow the lawn.

[wanderingbob]

WOW , now I am confused , Goggle sez one atmosphere is a column of water 33 feet high , as a former SCUBA instructor 33 feet equals one atmosphere so if I can get 33 feet in a tire of nitrogen at sea level , Oh the heck with it . I will just get out my bicycle pump and put 65 lbs of what ever into my Chinese tyres and then go practice for my upcoming recital .