Quote:
Drilled rotors are fine for the street and autocross because you don't build up heat as high when compared to driving a track day at a road course. Driving repeat extended hard laps at a road course will crack any cast iron rotor eventually, drilled or not.
Are you inferring its the elevated temps that mainly causes the cracking cracking issue? Because I thought that cracking was related more to varying and repeated temp changes, not the ultimate temp, and if that is true, seems like street use would have more and wider temp changes then a closed circuit race track use. I'm not sure of the temp swings.
I would think most would agree a drilled rotor would crack easier then a solid rotor, and most will agreed a failed rotor when being driven/used is kinda bad, where we agree to disagree and reagree is how likely that is to happen and how much risk one is comfortable with assuming that risk. 
Reality check, that half the population is smarter then 50% of the people and it's a constantly contested fact.
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