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Old 09-23-2014, 08:44 AM   #1
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Tire pressure/Temperature change

When we left Pensacola last week and I checked the tire pressure in the morning before we left. It was about 82 degrees then and the pressure was about 80 psi. Now we are in N GA and last night it went down to 58 degrees and the tire pressure went down 73 psi. I can't remember Boyle's law on pressure and temperature but do I need to bring it back to 80 psi? When we head south next week we will be seeing higher temperatures and higher tire pressure.
Any comment would be appreciated.
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Old 09-23-2014, 09:02 AM   #2
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If you run 80psi in your tires and it went down to 73psi then yes you need to fill back to 80psi or your tires will over heat. When you get back to where you were check them again and adjust accordingly. GL and safe travels
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Old 09-23-2014, 09:08 AM   #3
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I don't do it but some folks run nitrogen in their tires. Seems the tire pressure doesn't change with heat/cold or with elevation changes. And the nitrogen molecules won't leak out of a tire due to their larger size.
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Old 09-23-2014, 09:11 AM   #4
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Never run less that tire load/inflation charts. They list the minimum acceptable pressure for the corresponding load to avoid unsafe conditions.
That is one of the reasons I always use the Winnebago tire pressures listed on the vehicle ID placard, that factor is accounted for. I don't have to be concerned about varying temperatures and tire pressure dropping below safe limit as long as I'm not overweight.
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Old 09-23-2014, 09:21 AM   #5
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Quote:
Originally Posted by V3600 View Post
I don't do it but some folks run nitrogen in their tires. Seems the tire pressure doesn't change with heat/cold or with elevation changes. And the nitrogen molecules won't leak out of a tire due to their larger size.
Not true! Boyles gas law cannot be circumvented or ignored. What causes large pressure change is moisture in the air. Compressed Nitrogen is moisture-free. Normal air acts the same if a high-quality air-dryer is used at the compressed air line.
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Old 09-23-2014, 11:08 AM   #6
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Your tires didn't drop 7 psi merely due to temperature changes. The gas laws sow that the change would be 1.8% (percent, not psi) for each 10 degrees (F.) of temp change. The 24 degree drop would change your 80 psi to about 76-77 psi. If you are down to 73, either you have a leak or you measure one when the tires were hot (driven on recently) and the lower one when cold (not driven for several hours).

If 80 psi is the recommended cold psi for your tires, by all means bring them back up to 80, but do it when the tires are still cold. If necessary, take a reading when they are cold and figure out how many pounds (psi) to add, then drive to an air pump and add that many, even if it takes you above 80. The pressure will always be higher when the tire is hot from driving, and that is OK..
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