11-15-2017, 10:51 AM
Good information Bill. Michelin Truck Tire Service Manual states that:
"Ambient temperature will affect the pressure within the tire. For every 10-degree temperature change pressure readings will change between 1 and 2 pounds per square inch (psi). Consider this when checking pressures. Check all tires when cold at least 3 hours after the vehicle has stopped. Never bleed air from hot tires."
The chart you quote would indicate a larger change than that, more like 3 psi but the incremental change does seem to be a little greater at temperatures I hope to never experience with my Newell (-20 to -50). I am assuming that at higher temperature 100-120 degrees F, the pressure change is closer to the 2 psi per 10 degree temperature change.
To further complicate the matter, another factor in tire pressure is altitude. According to the Michelin Truck Tire Service Manual:
"Additionally, altitude can have a slight affect on pressure. For every 1,000 foot increase in altitude above sea level, pressure will increase approximately 1/2 psi. For example, a tire inflated to 100 psi at sea level will read slightly over 102 psi in Denver, Colorado."
"Ambient temperature will affect the pressure within the tire. For every 10-degree temperature change pressure readings will change between 1 and 2 pounds per square inch (psi). Consider this when checking pressures. Check all tires when cold at least 3 hours after the vehicle has stopped. Never bleed air from hot tires."
The chart you quote would indicate a larger change than that, more like 3 psi but the incremental change does seem to be a little greater at temperatures I hope to never experience with my Newell (-20 to -50). I am assuming that at higher temperature 100-120 degrees F, the pressure change is closer to the 2 psi per 10 degree temperature change.
To further complicate the matter, another factor in tire pressure is altitude. According to the Michelin Truck Tire Service Manual:
"Additionally, altitude can have a slight affect on pressure. For every 1,000 foot increase in altitude above sea level, pressure will increase approximately 1/2 psi. For example, a tire inflated to 100 psi at sea level will read slightly over 102 psi in Denver, Colorado."