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Proper Tire Air Pressure; Tell me if you've heard this one...
Topic Started: Jul 17 2015, 08:33 PM (1,924 Views)
myredvert
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myredvert

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Now these two facts got me wondering if our metros tires could be aired up to 100+ psi with no problems. Seems probable, huh?
Are you F-ing serious?

Sure, engineers do all that engineering and testing then rate tires just to F- with people who think engineers actually roll dice or pull numbers out of a hat to determine safety factors, limitations, and maximum inflation ratings.
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Woodie
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For the best discussion of tire pressure, one must read "Fear and Loathing in Las Vegas".
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myredvert
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myredvert

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For the best discussion of tire pressure, one must read "Fear and Loathing in Las Vegas".
Of course one must always make exceptions when road testing special tires. ;)
Edited by myredvert, Aug 8 2015, 07:04 AM.
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rjsdotorg
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RONNIEREDLINE
Aug 8 2015, 12:11 AM
if you have the most sensitive pressure gauge in the world and take the tire pressure with the valve at 6 o clock then due it with the valve at 12 o clock it should be a smiggin less at 12 o clock do to atmospheric pressures.
true but RREEEAAAALLLLYYYYY stretching it. this was on an engineers test as a trick question but it is real.
redline
I have a barometric I2C sensor that is accurate to one foot (STH01002S) per LSB.
Never thought of that though.
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myredvert
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myredvert

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take the tire pressure with the valve at 6 o clock then due it with the valve at 12 o clock it should be a smiggin less at 12 o clock do to atmospheric pressures.
The engineering unit of "smidgen" requires the most sophisticated laboratory equipment combined with a good imagination to measure, and you are actually talking about only a wee bit of a hair of one smidgen. :D

Edited by myredvert, Aug 8 2015, 04:14 PM.
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MR1 Kingsbury
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Exp. builder/rebuilder

myredvert
Aug 8 2015, 10:05 AM
Quote:
 
take the tire pressure with the valve at 6 o clock then due it with the valve at 12 o clock it should be a smiggin less at 12 o clock do to atmospheric pressures.
That's correct, but the engineering unit of "smidgen" requires the most sophisticated laboratory equipment combined with a good imagination to measure, and you are actually talking about only a wee bit of a hair of one smidgen. :D

yes and the amount of air that fills the valve to engage the guage will also make a much bigger difference then the 9" difference in alttitude 6 oclock to 12 oclock
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rjsdotorg
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And as I think about it, the air inside the tire is also affected by gravity, making it also denser at the bottom at the same rate as the atmosphere, so leaving the gauge on and rotating the tire should have no effect.
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RONNIEREDLINE
METRO MAD MAN

i should have known redvert would have chimed in!!!!
how are ya redvert, you took the bait ! !
nice to hear from ya again, love the tech talk with ya.
redline
Edited by RONNIEREDLINE, Aug 8 2015, 11:16 PM.
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Woodie
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MR1 Kingsbury
Aug 8 2015, 10:19 AM
9" difference in alttitude 6 oclock to 12 oclock
It's not nine inches, it's six hours.
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