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Author Topic:   Heat cycles in mod tires?
Dirt Administrator

Total posts: 3279
posted July 08, 2001 11:23 PM UIN: 16262997
Tires are one part of our racing program that we need to catch up on somewhat. I am wondering how hot a McCreary IMCA has to be before it goes thru a heat cycle to get harder. A harder tire will take more heat to get there, won't it? Then a softer tire will take less heat and go thru it's cycles to become harder. Help me here.....

Dirt Forum Racer

Total posts: 96
posted July 09, 2001 04:12 PM
Don't they get harder just sitting in the sun?

[This message has been edited by Sidebite (edited July 09, 2001).]

Dirt Full Roller

Total posts: 30
posted July 09, 2001 10:01 PM
It's been my experience that time in the sun will harden racing tires. The oils in the rubber evaporate, I think. If you leave them sitting out in the sun from weekend to weekend, you're giving away some traction. I left a brand new tire on an old car sitting outside through the winter and spring here in the desert and it got pretty hard.I'm about to grind it off and use it anyway. :-} I've heard that leaving them on a concrete floor will also take some of the oils out of a tire, but not nearly as bad as the sun. I've seen some evidence of this after a tire laid on the floor for a few months.

Dirt Roller

Total posts: 13
posted July 09, 2001 10:59 PM
im not sure what temp a tire has to be to go through a heat cycle, but i have talked to a very high up hoosier tech rep. one ofthe things we talked about were "sitting tires" he said that he would buy his tires for the biggest supplier and a late in the season as possible. reason being, who wants old tires. the oils in the tires do dry up and go away. so why buy the ones that have been at the speed shop all winter? also we talked about one of the biggest things to do to a tire. dont take a 4" grinder to the tire to clean it off, we use a da sander. this does not add any heat back in to the tire, the grinder does! i do this everytime we hit the track, each race, and even with new tires. this removes the releasing agent from the tires. this agent is an oil base that pulls it out of the tire mold. as for heat cyles i wish i knew more info im tracking temps w/ hardness numbers and track conditions now so maybe in a few months ill have more info and ideas!!
ltr spde

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