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Tyre pressure & Nitrogen

Yahoo Message Number: 12964
One good thing about living in Oregon is that the Department of Transporation leaves their (Us TaxPayer Bought) scales on even when they are closed. I weigh every trip, just for curiousity sake, (it's the annal Engineer in mee). But keep my tyres are maximum pressure. It might means rougher ride, but it is a safe Ride... Has anybody hear of nitrogen in tyres. My wife just had the tyres balanced on her Van at Costco and they filled the tyres with Nitrogen. They claim they will last longer, even put a Green Cap on Valve Stems.... Costoc did not say what effect delution with plan air would do on inflation checks and refills.....
Lee in Portland/Redmond

PS: The "Y" in Tyres is for David & Karen's enjoyment

Re: Tyre pressure & Nitrogen

Reply #1 –
Yahoo Message Number: 12974
Nitrogen is used in race tires because it is "dry" air and not subject to the fluctuations that moisture causes due to the moisture expanding and contracting within the tire. Nitrogen does still expand and contract, but not with the added element of moisture. If you watch NASCAR, you probably have noted that the announcers mention the drivers are cautioned not to go all out until their tires are "up to pressure".
My experience has been as a substitute "tire man" on a late model race team in Florida. In the circuit we race in, tire bleeders are allowed. They are simply relief valves installed on the wheels that are set to relieve and maintain a preset pressure on the race tire. In some cases after a race or practice session the tires are almost flat when totally cool.
Another observation I had last year on my motorhome tires: After being in Florida for three months my front tires had grown considerable in regard to tire pressure. I had inflated them to 110 psi prior to leaving Michigan, and when checked in Florida, the right one was at 126 psi and the left one just over 120 psi. The backs were higher but not significantly like the fronts. I relieved the pressure and checked them back in Michigan in the cooler weather expecting them to be at a lower pressure. They were a few pounds higher, not lower. Hmmmmm! Maybe it's the moisture.....or a gremlin going around inflating my tires!?? Maybe the tires are "hardening" up after going through another heat cycle? Race tires do that, too! Hmmmmmmm! This is "intrigueing"!

Joe

'97 Intrigue (with newer Toyos on front due to recall)
 

NITROGEN

Reply #3 –
Yahoo Message Number: 12965
Race car teams use nitrogen in their tires because nitrogen does not change pressure with the heating and cooling of the tires as air does.........