ya know drilled rotors also get rid of unsprung weight too! :)
chuck.
----- Original Message -----
From "Mueller, Robert CDR" <RMueller at grumobile.uscg.mil>
To: <spridgets@autox.team.net>
Sent: Thursday, June 13, 2002 1:06 PM
Subject: Drilled Brake Rotors
> Fellow Spridgeteers,
>
> Been following the thread on improving brakes, and the thoughts on drilled
> rotors in particular. On the Porsche 944 List, they consider most drilled
> rotors to be "eye candy," as they usually crack after hard use, like on
the
> track. Seems when they drill the holes, it sets up all sorts of stress
> points, and thus helps form the cracks. The "drilled" rotors that come
from
> the Porsche factory for the new cars are not drilled at all, but are
> actually cast with the holes in place, and thus don't have the stress
points
> (mega $$$, and not available for older Porsches anyway). I believe the
> original idea for "drilled" rotors was in the 917s back in the early 70's
> and the idea was to improve braking in the wet, to get rid of the thin
layer
> of water vapor that gets between the disks and the pads when water hits
the
> hot brakes. Since those brakes were internally vented, the idea was for
the
> water vapor layer to get sucked in the holes and out through the internal
> vents. I'm not sure that would work on solid disks that have been
drilled,
> so the holes on Midget rotors may do nothing positive at all. Anyway, the
> general consensus is that "drilled" rotors are a waste of money and as was
> mentioned earlier, the slotted rotors (with groves in the face) do a much
> better job of getting rid of that water vapor and don't crack
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