Tire Pressure VS. Temperature - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 10 (permalink) Old 12-28-2008, 07:22 PM Thread Starter
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Post Tire Pressure VS. Temperature

I have been reading up on how air temperature can effect tire pressure and decided to try my own experiment. Starting a little over a month ago I set the tire pressures of my trucks with the air temperature at 60*F. I randomly checked the tire pressures on different days with different temperatures. After checking the pressure with a digital gauge. I then reset the pressures back to the original settings. To save time I rounded the pressures to the nearest whole number. Here is what I found;

Silverado; Baseline Setting 80psi

Air temperature 40*F
Pressures; LF 76, RF 75, RR 78, LR 78

Air temperature 21*F
Pressures; LF 72, RF 72, RR 77, LR 77

Air temperature 36*F
Pressures; LF 81, RF 82, RR 84, LR 83

Air temperature 50*F
Pressures; LF 43**, RF 82, RR 87, LR 86


Suburban; Baseline setting 40psi

Air temperature 40*F
Pressures; LF 37, RF 37, RR 39, LR 39

Air temperature 21*F
Pressures; LF 35, RF 34, RR 38, LR 38

Air temperature 36*F
Pressures; LF 40, RF 42, RR 42, LR 44

Air temperature 50*F
Pressures; LF 42, RF 42, RR 44, LR 45


** Nail was found in tire. Had slow leak so data is corrupt.

Conclusion; across the board, the rear tires generally lost less pressure. This I believe is because of the weight of the engine in the front pushing down. Also note the higher pressure settings (Silverado) where generally more affected by changes in temperature.

I hope everyone can appreciate this. Please everyone, take a few minutes and check your tires regularly. Be safe out there.

-Robert.

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post #2 of 10 (permalink) Old 12-28-2008, 07:34 PM
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I usually see nearly a 10 psi drop from summer to winter on the big trucks.

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post #3 of 10 (permalink) Old 12-28-2008, 10:47 PM
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This past thanksgiving week I had new tires put on my truck. So far I have had to add air twice, about a month’s time. I too have noticed the front took more air then the rear. The past 5 years I had a different tuck with nitrogen in the tires, only had to have nitrogen added once. Now I wish I had nitrogen in the new tires, and I use to think the advantages of nitrogen were myths.
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post #4 of 10 (permalink) Old 12-29-2008, 06:11 PM
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isn't this just gay- lussacs law? P1 / T1 = P2 / T2

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post #5 of 10 (permalink) Old 12-30-2008, 01:15 AM
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I've heard that nitrogen stuff works pretty good...?

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post #6 of 10 (permalink) Old 12-30-2008, 06:02 AM Thread Starter
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Quote:
Originally Posted by Superdutytd View Post
I've heard that nitrogen stuff works pretty good...?
On both my trucks, when the tires where first put on, where filled with straight Nitrogen and from my experiences made no differences in how much or often I had to adjust the tire pressures. Since everyones circumstances are different, your results may differ.

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post #7 of 10 (permalink) Old 12-30-2008, 12:00 PM
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In my M3 I run pure nitrogen (not mix) and my pressures stay constant +-2 degrees even on the track as my tires warm up. Only problem I have is how expensive it is because they have to pull a vacuum inside the tire then put the in nitrogen.

I think the tech side is that the Nitrogen molecules are inert gas which isn't AS effected by heat or lack of heat.

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post #8 of 10 (permalink) Old 12-31-2008, 12:43 AM Thread Starter
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The two things I also didnt consider are atmospheric pressure and humidity. They both can have an effect on the contraction and expansion of air. If I ever repeat the experiment, I will measure those factors as well.

-Robert.

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2010 Chevrolet Malibu LT 2.4L 6A
2003 Chevrolet Silverado LS 6.6L 5A
1997 GMC Suburban SLT 5.7L 4A

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post #9 of 10 (permalink) Old 01-04-2009, 05:44 AM
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Quote:
Originally Posted by Superdutytd View Post
I've heard that nitrogen stuff works pretty good...?
That it does 99% big offroad rigs use it so they dont have to mess with the psi all the time in diff temps.




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post #10 of 10 (permalink) Old 01-14-2009, 07:18 AM
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pure nitrogen is better in many ways for tires. but untill i have to start paying for the air in my tires i will not consider nitrogen. by the way the earths atmosphere consists of approx 78% nitrogen. so i do put mostly nitrogen in my tires.
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