porsche rotor "holes cast in" phenomenon

[Bob]

When we visited porsche several years ago we went to the "Brake Drilling Stations"....

Bob

Greg Johnson wrote:

> *This message was transferred with a trial version of CommuniGate(tm) Pro*
> Chris
>
> Still commonly accepted.  In fact the website of one the "big brake" perveyors says: "Holes are4mm diameter as opposed competitor's units with drilled 8mm holes which are more prone to hairline cracking underrepeated heavy braking applications. {Porsche is the only company utilizing a special casting process where they form the holes in the mold which precludes disturbing the metal grain flow during the drilling process}."
>
> Greg Johnson
>
> Message: 3
> Date: Tue, 27 Nov 2001 16:33:00 -0500 (EST)
> From: Chris Covington <malth at umich.edu>
> Subject: porsche rotor "holes cast in" phenomenon
>
> Was this a myth dispelled or is it still commonly acccepted?
>
> Chris
> '91 200q20v