Order of Kilopi
Another one to explode your head...
Save Big on Gas by Filling Your Tires with Nitrogen
It prevents the tire from getting "Squishy".
The end result is that it is maintaining the pressure that is important.
And that's exactly what they say at the end anyway.
Oh; by the way, there's no danger in mixing a nitrogen filled tire with regular air.
Oh; did we mention that air is over 3/4 nitrogen?
Order of Kilopi
See also NEOWatcher's topic http://www.bautforum.com/questions-a...-nitrogen.html of two years ago.
Order of Kilopi
WOW; I don't remember that. Somehow I connected the story today with the latest Gas savings crazyness and didn't imagine it would have been done before. Even worse, by me.Originally Posted by 01101001
Honored Member
Not to mention 'crazyness' is spelled with an 'i'.
Order of Kilopi
Well; that's just crazi.
Honored Member
Who do you want: me, or Gillian?
Honored Member
Anyhow, when I read the thread title I thought it was going to be about burning nitrogen instead of oxygen in your engine.
Order of Kilopi
I only recalled a discussion here before, and I found yours. I thought you were now just taking on a different angle, but that the previous discussion was good background for other readers.
I've written things I've forgotten about. Don't worry about it. I think the BA recently amused his readers by admitting to coming upon an old BA Blog article he had forgotten he had written. I'd quote it now, but I've forgotten where I saw it. So many facts. So few brain cells. I have to store most of my memories on the Internet.
Order of Kilopi
I've heard that this happens with age.
Maybe a bit of nitrogen may keep the brain cells from getting "squishy".
Actually; it was a good opportunity to laugh at myself with that red splotch on my forehead.
At least you're not threatening to sick* Gillian on me.
*Interesting: I thought that was sic, but with the Gillian reference I figured I'd be safe and look it up and found it wasn't.
Established Member
I hate Fox
they are making Amerika dumber every day!
Should be outlawed
Order of Kilopi
Oh I´m surprised this nitrogen thing is still around. Remember that when you fill your tire with compressed air you´re basically filling it with...nitrogen.
A decade and a half ago, when I worked for Shell co., when this fad appeared, we tried that in our tankers. The procedure could theoretically remove moisture and keep an adequate pressure for longer. As a result you would get a more uniform tire wear and consequently a better gas kilometrage. Since the results were insignificant when compared to a control group using normal compressed air, the project was abandoned.
Established Member
Is that a trick question?
Nick
Banned
Let's go back to steel wheels on steel rails - there are some real savings in rolling friction to be had, there, and steel wheels never go flat, and never need inflating.
Order of Kilopi
Never?
Established Member
Careful with the self-ToSeeking ---- I hear that you can go blind...
Order of Kilopi
If your tires are "squishy", it means that they are under inflated, no matter what you fill them with!
The main advantage of nitrogen over ordinary air is that it is dry and therefore more consistent with temperature change. NASCAR has known about this for decades and they don't care about mileage. They change the handling of the car by changing the pressure in half pound increments (sometimes 1/4lb).
Established Member
I saw this only last week when I had to get a tire replaced, the fad seems to be alive and well in the UK!
Honored Member
Why not fill them with hydrogen, so the car would be lighter?
Banned
hydrogen leaks through steel tanks it will leak throgh rubber tires
Order of Kilopi
actually, they do care about fuel mileage.. many of the races are won by the team that makes one less fuel stop than everyone else.
Established Member
You are a regular Dr.Killjoy ace holmes, you've just killed a brilliant idea (Hydrogen on tires, it even has nice ring to it).
Order of Kilopi
I suppose I could consult the psychometric chart I have on the wall right behind me as I type, but it's easier to ask: dry air exhibits smaller volume change with temperature change than does humid air?
Last edited by geonuc; 2008-Jun-18 at 04:16 PM. Reason: changed last line to end with "humid air", not "dry air"
Established Member
Woah, 9 derailments in a year.. I'm wondering, was the NYC subway much more dangerous in 1983, or is it still this bad?John Simpson, president of the Transit Authority, said later that the accident appeared to have been caused by a flat wheel - a wheel that wears down unevenly and develops a flat spot. The derailment was the ninth this year and the second in less than two weeks.
Established Member
just this past weekend...
Dale Earnhardt Jr. went to victory lane Sunday for the first time in more than two years, and he wasn't about to apologize for how he got there.
Earnhardt nursed every drop of fuel in the tank ...
Established Member
Did you mean "wet air" one of those times?
Presumably if the tire air was very wet (ie, high humidity), then if cooled below its dew point, the water would condense, and the tire pressure would drop more than in an analogous tire filled with dry air.
The effect should be pretty small though --- by my calcs, a 30.0 psi tire at ambient temperature (20 C) and 100% RH would drop to 27.0 psi at 0C (assuming ideal gas law), whereas the same tire with dry air would drop to 27.5.
I wouldn't imagine there'd be any difference between the wet air tire and the dry air tire if they were heated.
Order of Kilopi
Agreed, but, since everybody (in NASCAR) is using N2 anyway, that drops out as a factor.
Order of Kilopi
Er, yeah. That was a test to see if anyone was paying attention.
Thanks, I revised my earlier post.
Honored Member
Nah, molecular hydrogen won't diffuse through a steel tank, and neither will helium. Helium might diffuse through the rubber, but still pretty slowly. That's why I chose hydrogen.
But more importantly, would the whine of the tires have a higher pitch?
Order of Kilopi
No, it's okay. Just put a hydrogen turbine inside each wheel, than pass hydrogen from an onboard tank through the tire and into the turbine, allowing you to have hydrogen filled tires. Not exactly practical, however.You are a regular Dr.Killjoy ace holmes, you've just killed a brilliant idea (Hydrogen on tires, it even has nice ring to it).
Established Member
In fact nitrogen does make your brain squishy. At high pressure - you need to breath air and dive to more than 30 metres, when you can develop nitrogen narcosis. The nitrogen acts as an anaesthetic, like xenon at seal level pressure.I've heard that this happens with age.
Maybe a bit of nitrogen may keep the brain cells from getting "squishy".
If you breath pure oxygen at sea level for long enough, and wash all the nitrogen out of your body, then you can become more alert, and perform better at certain mind tests! Sorry, can't remember the reference! Need less nitrogen!
John
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