Quote:
Originally Posted by derbo
What is considered operating temperature?
1 heat cycle as I understand it is cool > operating temperature > cool.
Based on that understanding:
1 heat cycle = 1 session track day, 1 session cool.
1 heat cycle = back to back 2 sessions in trackday.
Is that correct to think this way?
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And
Quote:
Originally Posted by tsk94
I would consider a heat cycle essentially on a per session basis. Where you bring the tire up to operating temp and it cools down (not necessarily down to ambient temp).
1 session = 1 heat cycle
The only time it wouldn't apply I suppose is when you go out for a session and almost immediately go back out for another.
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derbo Operating temperature and a heat cycle are related, but not the same thing.
tsk94 defined one heat cycle perfectly above i.e. from the ambient condition bringing the tire up to the operating temperature range (zone) its tread compound(s) and other rubber components were designed to operate within -
once - and then allowing the tire to thoroughly cool down to ambient temperature. So one on track session equals one heat cycle
IF the tire is exercised hard enough to get it hot enough to "come-in" i.e. into its tread compound's peak grip temperature regime. Sorry for all the words.
A tire's rubber compound(s) - especially its tread - are designed (compounded) to perform at peak grip depending upon the environment it's being used in. Example: a winter tire is designed to be supple and provide grip well below freezing in ice and snow, but that same winter tire doesn't do well at a race track during hot laps because the rubber compound in the tread isn't designed to operate at high ambient and hot operating temperatures (it will tear and wear like cheese). The topic of rubber compound operating temperature is discussed in the .pdf file attached - should you need more detailed information (starting on page 8).
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