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Tires, Wheels, Brakes, Steering and Suspensions Discussion of preventative/corrective maintenance and other technical issues regarding your coach's Tires, Wheels, Brakes, Steering and Suspensions and related components.

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  #1  
Old 08-16-2010
birds_first's Avatar
birds_first birds_first is offline
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Default Tire pressure & temp?

When I left this afternoon my pressure in the front tires were 110 in the shade and the tempature was 84 degrees. Running 65 mph and driving nearly 4 hours my pressure rose to 120L & 125 on the right front and the temp was 116 degrees. The right front was on the sunny side, the rear's temps were around 110 degrees. Is this about normal? I let the pressure alone & will check again in the morning before we leave.
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Old 08-16-2010
davidmbrady
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A 10 to 15% psi increase is what I typically see. I think you're right on. You get about a 2% psi increase for every 10 deg of internal air temp. If your tires increased by 10 psi ( 100 to 110 psi), then if you measured your tire's temp it would be at around 134 deg F.

P2 = P1 * (T2 / T1)

T1 = 84 deg F = 302 deg K
T2 = 134 deg F = 330 deg K
P1 = 100 psi + 14.7 (atmospheric pressure) = 114.7 (absolute) psi

P2 = 114.7 * ( 330 / 302 ) = 125 psi (absolute)
P2 (gauge) = 125(absolute) - 14.7 = 110 psi

Last edited by davidmbrady; 08-16-2010 at 09:23 PM.
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Old 08-16-2010
AC7880 AC7880 is offline
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Pretty close to the pressures I see.


Quote:
Originally Posted by birds_first View Post
When I left this afternoon my pressure in the front tires were 110 in the shade and the tempature was 84 degrees. Running 65 mph and driving nearly 4 hours my pressure rose to 120L & 125 on the right front and the temp was 116 degrees. The right front was on the sunny side, the rear's temps were around 110 degrees. Is this about normal? I let the pressure alone & will check again in the morning before we leave.
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Old 08-16-2010
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Bill Pape Bill Pape is offline
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Psi sounds good, Tires heat up under load, a trouble clue is when a tire is running much hotter,than the tire on the opposite side. Just touching with your hand or palm will warn of a tire running too hot.
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Old 08-16-2010
Jim Harvie Jim Harvie is offline
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One more reason why I like driving at night. Cooler tires, and less wind resistance, in a lot of cases, along with much less traffic. There have been times where I have been able to roll the rubber off of my tires using my hand, on a hot day, when loaded heavy, back in the trailer trucking days.
Of course there are downfalls with driving at night, as well. animals, black ice, reduced visibility, etc. You miss some nice views, but gain some, as well.
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