07-05-2015, 04:13 PM
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#1 (permalink)
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aero guerrilla
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Tire pressure vs temperature
I always check my tires' pressure before a trip, in the morning, before the sun warms them up. I keep them at the max sidewall of 51psi.
A few weeks ago I checked the pressure and noticed that all 4 tires are close to 60psi! Is it possible that if I pumped to 50psi on a cool morning (+5 to +10 C), then it would be 60psi on a warm morning (+15 C)? Or maybe I pumped to 60psi by accident (I often pump our bikes' tires to 65psi)?
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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07-05-2015, 05:38 PM
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#2 (permalink)
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Master EcoModder
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Maybe model the air in the tire as the difference in volume between two cylinders and use P.V = m.R.T. Plug in the numbers and see what the difference in pressure works out to be.
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07-06-2015, 01:20 PM
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#3 (permalink)
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EcoModding Lurker
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I've never personally had this issue (as I'm almost always asleep in the morning lol), however I have been to a few service station air pumps that have faulty air gauges. Not sure how you pump your tires up but it's a good investment to have a good air gauge to check your tires. I've never had good readings from cheap gauges.
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07-06-2015, 01:32 PM
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#4 (permalink)
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aero guerrilla
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The pressure gauge is integrated with the pump I use at home, and this is the only pump I use for the car and bike tires, so this rules out any variations between pumps/gauges.
__________________
e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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07-06-2015, 02:47 PM
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#5 (permalink)
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...beats walking...
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Our local Firestone Tire dealership has been kind enough to "check" all my pocket air-pressure gauges for me...checked against their *master* pressure regulator which they have checked/measured/calibrated every six months. They have a "T" shaped fitting that chucks onto their line while my gauge(s) connect onto one of the other two fittings...and we compare the numbers.
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07-06-2015, 05:07 PM
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#6 (permalink)
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EcoModding Lurker
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Quote:
Originally Posted by Piwoslaw
I always check my tires' pressure before a trip, in the morning, before the sun warms them up. I keep them at the max sidewall of 51psi.
A few weeks ago I checked the pressure and noticed that all 4 tires are close to 60psi! Is it possible that if I pumped to 50psi on a cool morning (+5 to +10 C), then it would be 60psi on a warm morning (+15 C)? Or maybe I pumped to 60psi by accident (I often pump our bikes' tires to 65psi)?
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I'd say this is normal, i find my tyre pressures rise with ambient temperature. |
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07-06-2015, 05:42 PM
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#7 (permalink)
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Cyborg ECU
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Quote:
Originally Posted by Old Tele man
Our local Firestone Tire dealership has been kind enough to "check" all my pocket air-pressure gauges for me...checked against their *master* pressure regulator which they have checked/measured/calibrated every six months. They have a "T" shaped fitting that chucks onto their line while my gauge(s) connect onto one of the other two fittings...and we compare the numbers.
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... and what were your results? Were your gauges worth the (little) money you spent on them?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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07-06-2015, 09:35 PM
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#8 (permalink)
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...beats walking...
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Quote:
Originally Posted by California98Civic
... and what were your results? Were your gauges worth the (little) money you spent on them?
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Two (dial gauge) were high at 40 psi...one read 41 psi, other read 42 psi.
One (pencil gauge) was low at 40 psi...it read 38 psi.
I've noted their errors on each gauge and am keeping records to see if those errors are getting worse or staying the same.
Last edited by gone-ot; 07-06-2015 at 09:41 PM..
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