terrasmak

iTrader: (8)

Yup , but i can put properly filtered air in the tires on my F-15. The water in air is the part the raises the pressure the most. Studies have shown a 1 to 2 psi difference on car tires that use Nitrogen. Thats at the normal pressures cars run , but when your running it in a jet at 320PSI the pressure change is much higher. It could be the difference between blowing a tire and not with the pressure increase.

BTW air is 21% O2 , 78% nitrogen and 1% misc gasses, being a scuba diver i know these things.

cessna

Thats why an A320 or a 737 tires dont blow from going from -45 Cel at 35,000F to landing when the tires get run up to over +170 Cel.....

With that said, I dont see how much of a gain you'd get by using Nt rather than regular air in your tires.

Spike100

+1 ...and for sure... that's a very valid point that I believe is missed on this thread. It is certainly more significant in colder climates where condensation and rust are issues. It happens, and nitrogen "filling" (as you point out) reduces/eliminates the problem.

Another point I would like to make is that nitrogen is really great (keeping the tire pressures constant) when you drive your car in an environment that has significant temperature variations. In Frostbite Falls, the temperature can vary more than 60 degrees F in a 24 hour period. When that happens, the TPS system in my Z goes crazy (reporting the tire pressures with this level of change in the temperature) when using "straight" air in the tires. The solution was simply breaking the bead (removing the tire), remounting the tire, and filling with nitrogen. Problem fixed.

When you consider the cost of tires and wheels for the Z, filling the tire with nitrogen is an inexpensive and wise decison that provides a degree of protection for your investment. My vote is paying a little bit more if you run your tires in any environment (track, cold climates with varying temperatures, etc.) for a nitrogen fill instead of plain air.

--Spike

PDX_Racer

iTrader: (2)

The lack of pressure change has more to do with the fact that nitrogen is generally "dry" while air has quite a bit of water vapor.

Spike100

Yes (and good point)... and I believe this is also the point that THE TECH describes in his post. Fill your tire with regular air on a humid day, and you get moisture somewhere (probably on the interior of your expensive wheel). If you run at higher speed (highway or track), the moisture evaporates, and the tire pressure increases. If and when the ambient air temperature drops, you get condensation and a loss of tire pressure, and moisture on the inside of your wheel.

Nitrogen fills make that problem go away.

--Spike

2 low Z

Partially true, the main reason we use nitrogen is for fire resistance when the tires let go during a brake fire. Sorry for the thread jack, I should keep this on the aviation boards but I fly the 737 and just finished studying for recurrent.

Enough about work, back to drinkin.

terrasmak

iTrader: (8)

Nope , its the same thing as above , if we get a brake fire hopefully the few PSI saved willnot cause the tire to blow.

2 low Z

uh...ok...

G35JCC

Has anybody tried Hydrogen in their tires?

Z04

iTrader: (15)

World Famous Z

iTrader: (42)

I know Jason is using it in his 240sx, I'm also running it in my daily driver SUV, and it's gotten a tad better gas mileage. Not a huge difference, but you tend to REALLY notice the small differences in a gas guzzling Chevy SUV.....

It's neat to do, good for track days or the performance oriented people especially...

efx

iTrader: (4)

i tried helium on racing days... gain 50hp

HKILP7M8

I have nitrogen in my z and feel I get a softer ride. Not much improvement in mpg however.

terrasmak

iTrader: (8)

All in your head , PSI is PSI .

Spike100

Hydrogen + "Brake Fire" = Hindenburg Zeppelin disaster

--Spike

Wired 24/7

iTrader: (2)

Come by my lab... I can fill your tires with N2, CO2, Argon, whatever you want

RKnight

I have actually seen visible beads of water in tires from water accumulated over time when taken off the rim. Costco uses nitrogen in all the tires they sell. I noticed the presessure in my tires doesn't go up near as much at the track because of the dryer nitrogen. Nitrogen is a smaller molecule than 02 so it doesn't leak from tires as fast as 02.

Z04

iTrader: (15)

http://www.powertank.com/truth.or.hype/

Wired 24/7

iTrader: (2)

Fixed... your logic didn't make any sense, and nitrogen is indeed the LARGER molecule, while O2 actually weighs more.

RKnight

These tests still don't account for the moisture buildup that occurs from repeated fills of air from compressors that don't have a good water seperater like the ones at self serve air stations at gas stations. Even my 20 gal. compresser in my garage without a seperater will cause water to drip from the exhaust port of an air tool after a few minutes of use during humid days.
Last month as I walked around the pits at the LB Grand Prix I noticed almost every crew had a bottle of nitrogen for servicing their car.