Quote:
Originally Posted by ZeroFuel
Old racing trick. Use nitrogen in your tires. This will greatly reduce pressure build up.
Find a shop with a nitrogen system to do the initial file.
Then you have the option of going to your local welding supply to rent or buy your own tank for topping up.
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Sorry, but air is 78% Nitrogen and even if it wasn't, the difference is gas doesn't really affect the pressure buildup. Pressure for all gases is governed by the same equation - Boyle's Law (also known as the ideal gas law):
PV = nRT, where
P = pressure (absolute)
V = volume of the gas
n = number of moles of gas
R = universal gas constant
T = temperature (absolute)
The reason racers use nitrogen is 2 fold:
1) Ordinary air contains water and when compressed it precipitates out. This is why it is recommended that compressors be drained regularly and why shop air lines, especially those used for painting, have a dryer close to the end of the line to remove any water that might make it into the line.
Water in a tire will go back and forth between water and liquid and this causes larger pressure swings. If you were to use "good" air (that is, dry), this is not an issue.
2) In many racing pits, you aren't allowed to have generators (fire potential), so it is common to use nitrogen tanks to power the impact wrenches. Since the teams already have this tank, it is common to use this to fill the tires.
For street tires, it's not so important to maintain the spring rate - and therefore the handling - so even the increased pressure build up due to the water going in and out of phase is not a problem.
Quote:
Originally Posted by theunchosen
capri I would quote but its kinda long and then its tedious to do scrolling.
I'm not particularly worried about static burst pressure, I doubt anyone here will ever do that to a tire if they are paying any attention. The fatigue or pressure creep is more dangerous. I'm ok with inflating tires to the max pressure(not under max loading by any stretch of the imagination, either do one or the other not both) because of the safety factor put in place.
Going over that. It might be safe anecdotally, but is it worth it? How many of you have had a tire go away while driving? You get new rotors new axles, new rims new tires new brakes new paint and maybe more. If it happens in a corner above 45 and there are obstacles its likely you'll be in the hospital. When a tire goes you have 0 control after that.
Not worth it to go over max, I use a gauge I know reads high and fill to max sidewall(41) which is really like 38
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Perhaps it wasn't clear, but I am with you regarding not inflating a tire over the max listed on the sidewall.
The point I was trying to make was that many folks say something along the lines of:
Quote:
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"........I'm only using 50% more than the max - 75 psi .....",
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when, in fact, this is actually TWICE the design pressure.