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Originally Posted by 68LSS1
... I am not following you logic about what atmospheric pressure has to do with it. When you put a tire pressure gauge on a empty tire what does it read? Zero, no pressure. With your line of reasoning I would have 14.7 psi in the tire. Explain to me how atmospheric pressure has something to do with this, I could be wrong, have been before (once in this thread already  ) and will be again. |
Actually there is 14.7psi in the tire. Everone drops of the G that should be at the end of PSI. G stands for gauge. A regular tire pressure gauge starts at 0 accounting for atmospheric pressure allready present. As far as the rest of the post... I still ain't figured it. There really is a check valve in a radiator cap?
68LSS1, I also think your tire pressure would increase with altitude. You fill a balloon at sea level it's x psi plus atmospheric. You go up in elevation the balloon is still x psi plus atmospheric where it was filled. The balloon will expand. In your above example the tire pressure would be 39.5 psig at altitude. Assuming calibrated/accurate gauges.