"Powell, Ken" wrote:

I was at one time considering going auto racing and did a lot of research 
on brakes.  I found that drilling causes stress risers
in the rotors but are necessary to vent the gases that form 
under the high heat load.  Most racers of the heavy cars (Mustangs
and Camaros) either drill or slot the rotors and replace them 
often as expendable items.  Drilled rotors on a street car should
be OK since we very seldom heat the rotors to cherry red.  
BTW, there are a lot of pictures on the NET of rotors that have
stress risers from the heat.

Ken P.

 
The AirCraft Rotary Engine NewsLetter.  Powered by Linux.
ACRE NL web site. http://home.earthlink.net/~rotaryeng/            
Copyright 1998-2003 All world wide rights reserved.