Author Topic: Good time to check tire pressure  (Read 725 times)

deathsled

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Good time to check tire pressure
« on: March 17, 2018, 09:12:51 PM »
Checked my tire pressure on big red and all four were down a bit.  Pumped them up after the oil change and all is good.  Word to the wise to check and maintain tire pressures.

Richard E.
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

shelbydoug

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Re: Good time to check tire pressure
« Reply #1 on: March 18, 2018, 08:04:31 AM »
Yes. Tire pressure for me seems to disproportionately decrease with big cold temperature drops. There is an engineering chart around that shows something like a 1 psi drop for every 10 degree drop BUT personally I've seen tire pressures regularly drop to about 15 psi from about 32 when the temps suddenly drop from the 40's to the low teens.

Probably has more to do with the ability of the valve stem to hold pressure under those conditions rather then the compression of the air in the tires.

Just my observations. Scientists may disagree.

Bigfoot

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Re: Good time to check tire pressure
« Reply #2 on: March 18, 2018, 08:33:16 AM »
“Changing gears....”
Its always a struggle to figure out exactly the pressure you need on the track.
And of course as you push the car and the temps go up so does the psi.
RIP KIWI
RIP KIWI

deathsled

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Re: Good time to check tire pressure
« Reply #3 on: March 18, 2018, 01:13:31 PM »
I've never been out on the track as a driver.  But totally logical as air molecules heat they expand therefore change the reads.  I understand that nitrogen filled tires work better because nitrogen is less susceptible to expansion.   
"Low she sits on five spoke wheels
Small block eight so live she feels
There she's parked beside the curb
Engine revving to disturb
She's the princess from his past
Red paint gold stripes damned she's fast"

shelbydoug

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Re: Good time to check tire pressure
« Reply #4 on: March 18, 2018, 01:34:06 PM »
I've never been out on the track as a driver.  But totally logical as air molecules heat they expand therefore change the reads.  I understand that nitrogen filled tires work better because nitrogen is less susceptible to expansion.

Yes.

I like helium better. When I go too fast it makes the scream a higher pitch.

Alan

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Re: Good time to check tire pressure
« Reply #5 on: March 18, 2018, 02:55:21 PM »
Helium held its pressure for me but traction got real sketchy.
‘67    0029

shelbydoug

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Re: Good time to check tire pressure
« Reply #6 on: March 18, 2018, 05:24:51 PM »
You need to breath the helium.