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rfuerst911sc · 03-11-2014, 02:37 PM

I didn't stay in a Holiday Inn Express last night

but I believe " drilled " rotors are manufactured two different ways. One is when the rotor is cast the holes are part of the casting process. These are more costly to make and less prone to cracking and are not chamfered. The second way is after the rotors are cast they are then machined/drilled. Less costly but more prone to cracking so part of the drilling process also bevels the edge of the holes.

03-11-2014, 02:37 PM	#5
rfuerst911sc Registered User Join Date: Dec 2013 Location: Dahlonega , Georgia Posts: 1,348	I didn't stay in a Holiday Inn Express last night but I believe " drilled " rotors are manufactured two different ways. One is when the rotor is cast the holes are part of the casting process. These are more costly to make and less prone to cracking and are not chamfered. The second way is after the rotors are cast they are then machined/drilled. Less costly but more prone to cracking so part of the drilling process also bevels the edge of the holes. __________________ 2002 Boxster S Arctic Silver with black top with glass window and black leather interior. Jake Raby 3.6 SS ( the beast ) with IMS Solution. 996 GT3 front bumper , GT3 rocker covers and GT3TEK rear diffuser and Joe Toth composites rear ducktail spoiler .