RV.Net Open Roads Forum: Changes in Air Temp and Tire PSI

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 > Changes in Air Temp and Tire PSI

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Campinghoss@51

Windsor NC

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Posted: 10/30/19 07:18am Link  |  Quote  |  Print  |  Notify Moderator

I run 110 in my G tires all the time. I only check the psi before leaving a cg or home regardless of the temp. Sometimes folks can sweat things that really don't need to be worried about. I always check when cold.


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ktmrfs

Portland, Oregon

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Posted: 10/30/19 11:28am Link  |  Quote  |  Print  |  Notify Moderator

philh wrote:

Pure nitrogen has ZERO advantage in car/truck/trailer tires.


Negligible yes, Zero, not quite. Nitrogen molecules are larger than Oxygen (even though atomic weight is less) so pressure drop over time due to the fact that tires aren't completely "air tight". Now to start with even with "regular" air your already at 80% nitrogen.

And since the process of getting pure nitrogen eliminates any water vapor there is less pressure variation due to changes in water vapor content.

The later can be solved by using an dry air source.

However, IMHO in the end unless it is free, offers no advantage worth paying for in consumer applications.

* This post was edited 10/30/19 12:17pm by ktmrfs *


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RambleOnNW

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Posted: 11/01/19 02:22pm Link  |  Quote  |  Print  |  Notify Moderator

Cold inflation pressure refers to ambient temperature at the time you are driving not the cool of the morning. An added factor is highways with sun shining on them adds additional heating. I usually inflate my rear duals to around 76-77 psi in the morning to target a cold inflation pressure of 80 psi at drive time and that produces a hot driving temperature of 88 psi as read out by the TPMS monitor. Pressure rise is around 1.5 psi for 10 degrees F.

* This post was edited 11/01/19 02:35pm by RambleOnNW *


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Campinfan

Washtenaw County, Michigan

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Posted: 11/01/19 04:55pm Link  |  Quote  |  Print  |  Notify Moderator

Gonzo42 wrote:

As a rule of thumb, air pressure in tires incraase about one psi for a temperature increase of 10 degrees F.

Tire pressure should be set when cold. That is such as first thing in the morning or when the tires have not been running for at least 3 hours. The settings specified assume an ambient temperature of about 72 deg F.

If the air temp you have is different, you can make a calculation such as: if ambient temperature is 52 deg F, reduce your pressure by 2 psi.


I concur. I had to study tires for Crash Reconstruction. Air them up cold to the sidewall amount. The tires are made so that when they warm up and the air pressure increases, it will be fine.


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