[Mgs] crossed drilled brake rotors

[Bob Howard]

 Bill,
    I have never understood how they would have much advantage. For
cooling, yes, there is additional metal exposed to air, but then the air
within the small holes would be pretty much dead air within the holes,
not being exchanged much for cooling, and if the purpose were to
dissipate vapors from the hot pads, the vapors would be trapped in the
holes during the time they were being clamped by the pads. .
    There is a firm advertising slotted rotors. These would appear to
have advantage, in that they could allow the vapors to squirt out the
slots and to allow dissipation of steam if the rotors and pads were wet.
How do slotted compare to drilled? 
   Could you write more about these topics?
Bob

On Thu, 20 Sep 2007 15:05:05 EDT WSpohn4 at aol.com writes:
> In a message dated 9/20/2007 11:52:09 A.M. Pacific Daylight Time,  
> peter at nosimport.com writes:
> 
> They  made one H**L of a difference on the track this past weekend!
> 
> The car  would reliably  vibrate  wildly every time the brakes were  
> 
> applied at any speed.
> 
> One rotor cracked all the way across, and the  other rotor was about 
> 
> to at every drill hole.   
> ____________________________________
>  
> 
> 
> 
> You know, Peter, I WAS going to mention that possibility, but  
> figured it was 
> a rare enough problem that I wouldn't bother.
>  
> Guys, he is absolutely right, when you are racing and the  rotors 
> are 
> subjected to extreme heating and cooling cycles, the holes can give  
> rise to 
> radiating cracks.  As I said, probably not a factor for street  
> use.
>  
> Bill
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