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Old 19th September 2013, 14:28   #781
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Default Re: Inflating tyres with dry nitrogen

Thanks to SS-Traveller for sharing this:

Quote:
Here's a very lucidly explained article about why it's a myth that nitrogen in the tyres of a regular road-going car has any advantages: http://www.l2sfbc.com/rmp/blog/is-it...-with-nitrogen. It's a recent article

Here's one more : http://www.powertank.com/truth.or.hype/

Last edited by Rehaan : 20th September 2013 at 12:03. Reason: Adding one more link
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Old 8th April 2016, 12:45   #782
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Originally Posted by apachelongbow View Post
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The other urban myth is nitrogen filled tyres, nothing can be further from the truth, especially when air contains 79% nitrogen. May be we must experiment with filling helium in tyres, it is inert, lighter than air, it would reduce vehicle weight or rather offset it and may be we can have better fuel economy??

Not an urban myth, it's very real, although for regular cars the practical advantages are relatively small. On some applications such as certain aircraft tyres it could be mandatory if not a formal legal requirement.

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Old 9th April 2016, 10:16   #783
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Originally Posted by apachelongbow View Post
On aircraft tyres it's used only to negate fire risks... just because of high speeds involved.... useless when it comes to road cars. In fact myth busters show has a episode on the same thing.. interesting to watch. People think it helps tyres run cooler.... big myth, or prevent tyre blowouts.. another myth
Correct.

The biggest urban myth about nitrogen is that people believe it is a total urban myth. The physics behind using nitrogen over air is real and factual. However, as said before on cars the practical use is less than minimal, but on aircraft the effects are much more pronounced, primarily due to the high temperatures and high pressures involved.

It is in fact the main reason behind for instance the FAA making it mandatory by for instance the FAA:

http://www.airweb.faa.gov/Regulatory...light=87-08-09

And a more in depth article:

http://www.nitrogentiremachine.com/f...nistration.htm

Even for places where it is not mandatory, manufacturers such as Boeing will recommend it strongly:

http://www.boeing.com/commercial/aer...nly/m03txt.htm

Technically it is not the high speed that is the problem, but the high temperature in combination with a potential chemical reaction between atmospheric oxygen and volatile gases from the tire inner liner producing a tire explosion.

During the take off roll, tire temperature do increase some, but it is during the landing and the braking that they get really hot. To your point, they donít help to run the tire cooler, its just that when they are filled with nitrogen they are able to withstand those high temperatures better..

With the introduction of carbon brakes on aircraft, the brake temperature has gone up as well. Carbon brakes are most effective when they are run up to pretty high temperature.

Having said all of that. (Clean) Nitrogen has certain properties that do have additional benefits. Whereas on regular cars they have little or no practical use, on aircraft application you will see some of the benefits. E.g. less deflation, less corrosion, no ice formation. Note that due to the very high pressure and temperatures all such effects are more pronounced on an aircrafts then on regular cars.

But as stated before on aircraft first and foremost itís the benefit of the high temperature and thus explosion protection which is the reason for use of nitrogen on aircraft. The rest is just bonus.

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Old 5th June 2017, 12:24   #784
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Default Re: Inflating tyres with dry nitrogen

Never been a believer of filling nitrogen in my tyres. Here's an excellent article from Jalopnik:

Quote:
Yes, nitrogen is technically a better gas to fill tires with than air, though itís not really so much about nitrogen itself as it is not having water vapor in your tires.

Is it worth it? For normal driving, probably not. The advantages, while real, are still really very miniscule. Also, remember, we live in a big soup of air, so even if your tires are full of nitrogenóand that actually means about 93 percent 95 percent nitrogenóthereís still a whole atmosphere of damp, oxygen-tainted air pushing its way into the tires.

If youíre a professional racing driver or even just like to track your car a lot, then, sure, nitrogen-filled tires may give you just that little bit of edge for handling and will keep their pressure better longer-term which may give a slight edge on the track. It canít hurt, certainly.

Also, unlike oxygen, nitrogen does not support combustion, so thereís a bit of a fire safety advantage as well.

If you have the money and can tell when one of your tires is 1 PSI less than the rest, or you have a pit crew and make a living racing cars then, please, jam as much nitrogen into your tires as you want.

For everyone else, I think you can get by just fine by bragging that you fill your tires up with a special mix of 78 percent nitrogen.
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