porsche rotor "holes cast in" phenomenon

Greg Johnson gregsj2 at home.com
Wed Nov 28 07:47:23 EST 2001


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?

'91 200q20v

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