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Old 02-03-2016, 07:48 AM   #21
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There are tons of threads on this subject. The general consensus seems to be that nitrogen maybe be fine for racecars and airplanes, but, no significant advantage for the RV world.

To the OP, treat nitrogen the same as air and you can use air if tires are low - no problem mixing.
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Old 02-03-2016, 08:29 AM   #22
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Quote:
Originally Posted by aufinger View Post
The below information is from an article posted on Nascar.com. It makes sense when you're going 180-200 mph.

"The reason NASCAR tires are inflated with nitrogen, rather than the normal air we pump into our tires, is due to the increased stability under hotter temperatures that the gas exhibits. It allows the tire pressure (50 pounds per square inch) to remain constant throughout the race regardless of the temperature, which can reach 200 degrees Fahrenheit."
At 200+ mph a half a pound change can cause a significant change in handling . Not the case with an RV at 60 mph.
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Old 02-03-2016, 10:26 AM   #23
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OK ... now we began the Nitrogen story...
I made a document about it , and even state that filling with normal air is better then with Nitrogen.

In addition I can state that 100% nitrogen in tire is hard to get, best by a cylinder , and not by a device on the air hose . Those give about 95% Nitrogen , wich percentage stays about the same when pressure drops, because difussion speed is then the same for oxigen and Nitrogen.

Filling car tires with normal air is better then with Nitrogen.

A. Oxygen, which makes 21% of normal outside air, in volume absorbs more energy to rise a degree in temperature then Nitrogen.
Difference is only 1% , but in selling argument is sometimes mentioned in energy/ mass so Joule/kg.degr. Kelvin and there Nitrogen wins by 13 % . Tires though are filled with a certain volume so that counts .
This selling argument can be de-myth simply by the fact that its untrue.

B. Water in a tire transports the heat more then dry air or Nitrogen-filling ( which is by its production process free of water).
Not for no reason water is used in central heating and cooling system of cars as main substance.
The tire inside will have lower temperature which is better for cooling down the important spots of the tire wich have to keep a low enough temperature to prevent hardening and damage in next bending of those parts.
When incidentally the tire inside gets hotter ( sunshine on tire or severe braking, or high ambient temperature) more water goes over to gas wich highens the pressure inside the tire more then dry gas. Also then more water as gas in tire so even better cooling.
So advantage of water is 2 ways when needed, better cooling and lesser heat production.
Disadvantages of water as oxidation only happen at outside . Tire specialists will confirm that when they remove a tire of the rim , the rim inside the tire is not corroded.

C. When a Truck, transporting flammable substance, is on fire, the little oxygen in a tire will , when exploding ,probably even kill the fire .
In tunnels experiments where done to kill the fire with air current , and it worked, despite the oxygen in it.

D. A normal car tire up to truck tire is not a race-car tire, for which a constant as high as possible contact area, so best grip , is needed to give half a second better round time.
For that reason they are filled with as dry as possible air or Nitrogen.
That this gives low lifetime is not important, and for a normal car tire it is.
Often blowing tires at racing, is seen there as collateral damage, but we donít want that for normal car tires.

E. A car tire is also not a airplane- tire in which the water can freeze and when landing this can give misbalance , which can lead to tire-failure or accident, when suddenly going from zero to about 200m/h.
The water in a car tire does not freeze that often, and when it does and the car begins do drive , it begins slow and the misbalance is not a big problem . then pretty soon, certainly when on speed the ice is melted to water and problem will be gone.

F. When filled with normal air the user is aware of checking the tires regularly, which takes better care of a saver tire, because regularly filled up to the right pressure and optical checking of the tire .
The illusion that Nitrogen filling makes the tire to loose almost no pressure, which is often exaggerated to 5 times , while in real a poor 2 times and then only in the very beginning, makes the user less caring .
The tire also looses air when hitting pavement so temporary leak between edge of tire and rim, Filling with whatever gas-combination wonít prevent that.

This idea is even stronger when TMPS is used which is often inaccurate , so the user thinks to maintain the right pressure, while really riding with to low pressure for longer time, which can lead to tire damage. Aftermarket sensors for TMPS when screwed on the valve can give leakage trough hole where valve is placed , because of the bending of the valve by centrifugal forces at speed.

G. Filling with normal air is always possible, even with a bicycle- pump, is only to fill up so wonít take that long. When you keep driving with to low pressure , in order to find a place to fill with Nitrogen, you damage your tires. So just fill up with normal outside air, even when the tire is filled with Nitrogen. Then also you donít need to have the tire refilled with pure Nitrogen by your tire specialist when at home again, not worth the trouble, and normal air is even better then nitrogen because of the water in it.
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Old 02-03-2016, 10:47 AM   #24
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That's more than I ever need to know about nitrogen.
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Old 02-03-2016, 11:01 AM   #25
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[QUOTE=doc73;1092765]My tires are aired to the max pressure and that is what the RV called for... But that said if the RV said 40 and the tire said max of 60... I'd air to 60. These things are loaded so close to the max tire weights I would want all the help I could get for the max load.[/QUOTE

Agree!
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Old 02-03-2016, 11:08 AM   #26
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Originally Posted by youroo View Post
To the OP,first to the V-Nose group! Since you are asking I would say 1st thing is Make Sure your tire Gauge is CORRECT! Most Free/Cheap gauges are OFF any how! Then fill your Tires with Air to the Max PSI COLD stated on the Sidewalls! You can carry a Little AC with you or stop at Any Tire store for Air,But Not all Places have Nitro! I would devote more time to Upgrading the O/E Tires! Youroo!!
Bingo! Get some good tires and a good gauge and keep them at the cold PSI.
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Old 02-03-2016, 11:09 AM   #27
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And lube those bearings yearly or that tire pressure won't matter..
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