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Re: Cross drilled or slotter rotors? Opinions needed

jim catterson wrote:

>  my experience is that the cross drilled rotors have the cool factor
> going for them but that is about it unless the holes are cast in
> rather than drilled.  if the holes are drilled in [and even if the
> holes are champhered],  they are prone to stress cracking.  have not
> had any warping though on two different porsches [930 and 911sc] w/
> cross drilled rotors.  the gas slotting actually works pretty well and
> is far more robust than drilling

How does porsche do it? I thought they were drilled afterwards, they are
cast in?