Nitrogen filled tires?
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by RED84CF
Pressure holds, less corrosion on rims due to no water vapor, less rolling resistance, which gives the biggest advantage BETTER GAS MILEAGE. Everybody I know that runs nitrogen in the tires have seen better gas mileage, more so on long trips.
Rolling resistance and therefore gas consumption are less with nitrogen than with air?. Go back and review posts #33 and #39. Then explain why tires with 30 psi of air, 30 psi of nitrogen, or even 30 psi of laughing gas would have different rolling resistances.
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Instructor
Joined: Mar 2005
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From: Thornton CO
Originally Posted by CFI-EFI
Maybe, BUT I'm talking about the pressure in the tire, not the permeability of the gas through the tire or the gauge. Maybe my original question about feathers and lead was too obtuse. How about, which has the higher pressure, air at 30 psi or helium at 30 psi?
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Racer
Joined: Mar 2006
Posts: 421
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From: Fontana Ca
According to what I have read on other sites on this same subject, as you drive, your tires loose pressure because the oxygen leaks out (the nitrogen doesn't because they are larger molecules.) Thus you will end up with tires that have a higher nitrogen concentration anyway without having to pay extra.
Racer
Joined: Oct 2002
Posts: 416
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From: Westfield MA
Originally Posted by nonni777
The main reason for Nitrogen in aircraft tires is that the tire pressure changes very little in the extreme temperature differences that aircraft are operated in, another is little or no water content.
Nitrogen is far from leakproof, aircraft tires need frequent servicing, I see no reason it should be any different in a car.
For street use in cars or motocycles, Nitrogen has no benfits exept for the people selling it at stupid prices.
Nitrogen is far from leakproof, aircraft tires need frequent servicing, I see no reason it should be any different in a car.
For street use in cars or motocycles, Nitrogen has no benfits exept for the people selling it at stupid prices.
The use of nitrogen (or another approved inert gas) is intended to eliminate the possibility that a chemical reaction between atmospheric oxygen and volatile gasses from the inner tire liner will cause an explosion of tire/wheel assemblies.
In fact, Airworthiness Directive 87-08-09 specifies that aircraft tires mounted on braked wheels may not contain more than 5 percent oxygen by volume. Aircraft covered by this AD will have a placard that says "Inflate tires with nitrogen only."
Aside from the safety factor, the use of nitrogen, which does not contain moisture like atmospheric air, also greatly reduces oxidation damage to the interior of the tire.
Burning Brakes
Joined: Mar 2006
Posts: 808
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From: Metairie Louisiana
Originally Posted by CFI-EFI
You know of tires filled with oxygen? And I thought hydrogen would be risky.
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AIR! Picky, picky.As if you or any other forum member didn't know what I was referencing.
Thread Starter
Instructor
Joined: Feb 2006
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From: rowlett tx
Originally Posted by stearnman
No, I understood what you were saying...30 psi is 30 psi whether it's air, helium, raddon, hydorgen, nitrogen, nitrous-oxide, etc...I thought we were discussing the pressure sensors themselves. So, I might have misunderstood that part of your post. My bad.
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Race Director
Joined: Dec 2002
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From: SCMR Rat Pack'r Charter Member..Great Bend KS
Originally Posted by raisinbran
correct psi is psi.. but what im interested in is what happens as you drive and the tires heat up? does regular air heat up less or more than pure nitrogen? as the air/nitrogen heat up, what happens to their pressures? (hope my question makes sense)
The thing is, car and tire manufacturers take this into account when they recommend a normal/loaded/high speed inflation pressure for their cars' tires. That's why they advise checking the tires when they are cold: so the tire will be at the proper pressure when they are hot.
N2 fill? Sure won't hurt anything, but I wouldn't go out of my way to find the stuff, not when I have an air compressor in the garage(that I keep drained). That may be key: bottled N2 is probably much drier than the average compressed air source. I've seen too many aluminum wheels that are corroded in the area inside the tires to not take it seriously.
Larry
code5coupe
Last edited by rocco16; Oct 5, 2006 at 03:08 PM.
Safety Car
Joined: Sep 2000
Posts: 3,524
Likes: 4
From: Hinckley Ohio
My random thoughts on this...
Nitrogen is used in some none tire applications since it provides a dry(no moisture/water) and inert (no oxygen) gas.
These features would offer advantages in a tire application....
No oxygen to age tire from the inside......no moisture to condense on interior wheel surfaces and possibly ice up under certain conditions.
Cost seems to be the only issue...that is cost for limited benefits..
Seems no one can really explain the stable pressure mechanism???? Except that the larger nitrogen molecule doesn't leak out as easily as the other air gases..
???????
Nitrogen is used in some none tire applications since it provides a dry(no moisture/water) and inert (no oxygen) gas.
These features would offer advantages in a tire application....
No oxygen to age tire from the inside......no moisture to condense on interior wheel surfaces and possibly ice up under certain conditions.
Cost seems to be the only issue...that is cost for limited benefits..
Seems no one can really explain the stable pressure mechanism???? Except that the larger nitrogen molecule doesn't leak out as easily as the other air gases..
???????
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Racer
Joined: Nov 2002
Posts: 478
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From: langhorne
Originally Posted by toptechx6
Nitrogen? Hell, that's old technology, I use helium in mine, reduces unsprung weight and cut 2 tenths off my ET and if you think they ride good filled with nitrogen, wait till you try helium!
I use nitrous oxide in mine! a little in the tire a little for me a lttle more for the tire....what were we talking about?:o Oh yea,
sure FEELS like a nice ride!