Quote:
Originally Posted by CapriRacer
As you point out, there are lots of variables.
That is why it is difficult to convinced people of the basic
principles involved - their own experiences and what they
read on the internet don't include such subtleties as what
has the biggest effect and what can be ignored (not having
a significant effect).
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So based, probably, on the topmost three statements in this link, regarding pressure, density, and temperature of air:
http://msrc.sunysb.edu/~chang/atm205...ter_1_txtb.pdf
The providers of that blue chart are suggesting that, for every F10° below F70°, one should increase their cold tire pressures according to the grid.
IE: The vehicle placard on my Honda Accord recommends 32PSI cold, as long as same size and speed rating of tire are kept on it when replacing.
For temperatures from 70F up, that cold pressure can be maintained.
However, when first thing in the morning temperatures start to average 60F, I should add a pound - to 33psi cold. And so on...
Until the average morning temperature, say in February around here, averages only 20F, then I should be maintaining 37psi cold. Come April, with average dawn Temps around 40F, then it's OK to deflate them back to 35psi cold.
Again, based on the principles, concerning air pressure, density, and temperature, in the above link.
So if I had a big old Econoline or Express van, proper light truck tires, and recommended rear axle cold pressure(80psi) = Max cold pressure on the tires, is it ok, per those principles and that chart, to keep them at 85-87psi cold, in winter?
But, if colder air is more dense than warm air - the opposite of what I assumed for most of my 51 years, why are they suggesting increasing cold tire pressures at lower ambient temperatures?
Barry you can probably tell I spent many years in special ed schools - they never taught us any of the above stuff! lol