Discussion in 'Tyres & Alloys' started by Ravi, Dec 30, 2010.
What tyres are filled with Oxygen?
Very well put rajan!! I have filled Nitrogen for exactly the same reasons stated here by many,but that doesn't deter me from checking Tyre pressure every month ... so ,ultimately its us-the drivers' conscientiousness that counts!!:up
I have been filling my tyres with nitrogen for past few months and see a cosiderable amount of difference in the overall smothness of ride.
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Superb find Rajan!!! Completely agree with all the points. I, for one, believe that the Nitrogen story is just hogwash. The only 'advantage' is that the pressure does not reduce over a short period. I really haven't found any difference in ride or handling. As many have mentioned here, air is 78% Nitrogen and I'm not sure if what they are filling as Nitrogen is 100% pure.
thats true, its cool, its property is such that it remains cool, wheres normal air due to atmospheric condition becomes hot. since its cool tyre wont burst due to continuous friction.
Please do not take the above explanation to heart and ensure the tyres are properly inflated and have good tread.
Those who are pro nitrogen be prepared to be surprised
I stopped using nitrogen in my car after i saw this.Also please understand that atmosphere air is 78% nitrogen.
In my view this falls in the category of "Use nitrogen if you like, Use air if you like" .
There is no real benefit of N2 in my view.
There are always comparison made w.r.t airplan tyres being inflated with N2, well for those who quote that as reason for filling it on there cars, my 2 cents..
Aircrafts land between 150mph to 220mph (roughly) depending on conditions.
aircrafts can weigh as much as 200M.Tons so all that mass hitting the ground at once would mean there is immense head generation and perhaps there it makes sense.
Likewise in F1 cars as they don't expand as much at sustained high speeds..
for a normal 20kmph or even 140kmph there is not much N2 has to offer..
This has always been my take.
I know that you will benefit by using Nitrogen in your tires instead of air. There are a lot of advantages that you should be aware of.
What is Nitrogen?
Nitrogen is a dry, inert gas used to inflate airplane tires, off-road truck tires, military vehicle tires, and race car tires for improved performance, more tire mileage and better fuel economy.
Why use Nitrogen?
* Less inflation pressure loss
* Reduced wheel corrosion
* Prevents inner-liner rubber deterioration by oxidation
* Tires run cooler
* Increases tread life
* Increases fuel mileage
* Helps prevent uneven wear
Oxygen in compressed air permeates through the wall of the tire, thus reducing the tire's inflation pressure. During its journey through the tire wall, oxygen oxidizes the rubber compounds in the tire, causing under-inflation and deterioration of the rubber . Dry nitrogen will maintain proper inflation pressure and will prevent auto-ignition, will not corrode rims, extends valve core life, and will help the tire to run cooler.
The biggest advantages - improved tire life
Experts in the tire industry indicate that oxidative aging is one of the primary causes of decreased tire life. Oxidative aging is caused by the diffusion of oxygen from the pressurized air cavity of the tire to the outside atmosphere. Tests have shown that if tires are inflated with nitrogen, there is a significant reduction in tire failure.
Why did race cars, military and off-road vehicles switch to Nitrogen?
Air is about 1/5 Oxygen, and oxygen, especially at high pressures and temperatures, is a very reactive element.
When oxygen reacts with things, the process is called oxidation. When oxidation is extremely rapid, it's called "burning.
That's one reason nitrogen is used in off-highway and aircraft tires. These tires run so hot they can actually catch on fire. Nitrogen doesn't support combustion, so nitrogen-filled tires don't add fuel to the flames. And nitrogen helps prevent slower forms of oxidation also.
Nitrogen prevents other types of corrosion as well
Oxygen and moisture corrodes aluminium and steel wheels. Oxygen also reacts with rubber, another type of "corrosion". When this corrosion starts, the small particles break off and form rust and dust, which can clog valve cores, causing them to leak. The rough surfaces created from the corrosive action on the wheels leads to tire beads that don't seal properly, causing additional leaks .
Oxygen also ages the inner liner, the thin layer of rubber inside the tire whose function is to keep air away from the carcass. As the inner liner ages, more and more air molecules can pass through it, causing more pressure losses. These pressure losses in a truck tire can average 2 psi a month as a result of the air passing through the sidewalls. As it passes through the rubber, the oxygen can also corrode the steel cords, causing them to rust too.
How does Nitrogen help?
While both nitrogen and oxygen can permeate rubber, nitrogen does it much more slowly. It might take 6 months to lose 2 psi with nitrogen, compared to just a month with air. And nitrogen is far less reactive. It doesn't cause rust or corrosion on steel or aluminium, and it doesn't degrade rubber. Wheel surfaces stay smooth and clean, rubber remains supple and resilient.
Nitrogen also will not degrade the rubber seal in the valve core which extends valve core life and helps prevents core leaks.
Small bits of dust and debris as a by-product of oxidative corrosion to the wheels and alloy rims can lodge in the valve core seat, causing air leaks.
Any other reasons for using Nitrogen?
Water!! The air around us is full of water vapour. Compressing air concentrates the water in it.
Draining the water from your compressor tank (used by air filling stations and tyre wallas) daily helps, but unless you have a really efficient air dryer system, chances are that there's a lot of water in your compressed air.
When you compress air, it takes up much less volume, but the percentage of water by
volume is greatly increased.
...and what harm does this moisture cause?
Water vapour in compressed air acts as a catalyst, accelerating rust and corrosion. Water vapor also absorbs and holds heat. And when it changes from liquid to vapor, water expands tremendously in volume.
As a result, tires inflated with wet air tend to run hotter and fluctuate in pressure more. That's one of the reasons why racing tires, where fractions of a psi can radically change the handling characteristics, are inflated with dry nitrogen.
Will my tires have 100% Nitrogen after they are filled?
In reality, no. The Ingersoll-Rand Nitrogen Generator puts out 98% pure Nitrogen. On an uninflected tire, there is still some air present, so after you refill with nitrogen, you'll end up with about 95% nitrogen, which is enough to do the job. That can be increased slightly by filling up the tire with nitrogen without a valve core in the valve stem, and then letting the tire deflate. Then install the valve core and refill to normal pressure with the nitrogen. (purging)
·******** A big % of atmosphere around you has Nitrogen and a very small % has oxygen, still Iron rusts in atmosphere. Still Silver becomes black. Copper goes dark brown.
·******** I would request everyone who says *normal air is best please go to wherever you fill normal air from and take that pipe and spray a small amount of air into your hand or a dry tissue paper. Look at the amount of water accumulated in few seconds and come back and post here.
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from my personal experience i would not advocate Nitrogen. The main reason is we have noticed the ride becomes more bumpy if there is a slight difference in psi.
The cost involved is much more for filling and refilling. i would not advocate nitrogen on Cars which run with a profile upwards of 15.
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