Thread: Max PSI
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Old 05-01-2017, 09:17 AM   #16
JRTJH
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Join Date: Mar 2011
Location: Gaylord
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Good one, Jeepshots. Maybe a continuous monitoring system, but what about at night, when you're sleeping??? Wouldn't that run down the battery and wouldn't the compressor wake up the baby? We've got enough "phantom drains" on the battery system already, adding more without having "solar and lunar charging" (that wouldn't be efficient use of that "night-time light).... OK, I know, and it was said "tongue in cheek".....

Now, Not directed at Jeepshots, but intended as a general comment, the reality is that even a "first semester engineering student" is taught that environmental conditions are always "engineered into the system". What that means is that the ambient temperature (cold inflation pressure) is expected to rise with use. That environmental rise, caused by tread friction, heat, loading, sidewall motion and a host of other "not usually considered" conditions is factored into the "operating pressure rise" of the tire. Every tire manufacturer considers this when designing a new tire for the market and it's a part of the testing process during pre-production tests and is followed closely after the tire is released to the public.

Every tire manufacturer has considered and accommodated the ambient/operational/environmental pressure increase in the design concept of the tires that are on any RV. Most tire manufacturers, somewhere in their literature have instructions that follow these guidelines:

1. Check tire pressure and adjust the "cold inflation" (which means before the trailer is towed, not before the sun hits the tire)
2. Do not bleed air from a tire that has been towed to "lower it to the recommended max pressure".
3. Do not adjust for altitude or temperature in a hot tire. A tire is considered "cold" after it has cooled for approximately 3 or 4 hours.
4. Expect about a 1 PSI increase for every additional 10 degrees F and about a 1 PSI decrease for every 10 degrees that the temperature falls. Understand that the latter, temperature decreases are more dangerous than the increases because underinflation leads to more potential for tire damage than slight overinflation (which is already factored into the tire design).
5. Monitoring tire pressure does not mean adjusting tire pressure as it will be constantly changing based on the above factors, all of which are a part of the design elements of the tire and are fully compensated for in the tire construction.

My thoughts, for what they're worth, tire pressure is something to consider and to stay "ahead of" but it's not "rocket science" and it doesn't require an extra-ordinary amount of time and thought during use. Just adjust pressure before the tires are "sun soaked" and monitor them frequently during use. No need to "overthink it and make it impossible to do".....
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