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Re: drilled rotors

To: <shop-talk@autox.team.net>
Subject: Re: drilled rotors
From: "Elton Clark" <lotus.tony@airmail.net>
Date: Sun, 10 Mar 2002 20:33:57 -0600
Doug wrote:

>>> It is interesting that all (?) motorcycle rotors are drilled, but not
vented, and that most cars are vented but not drilled.<snip> Bikes clearly
need to reduce unsprung weight  <snip> cars have more problems with heat
<snip> I do think the drilling improves immediate brake  response when the
rotors are wet, may increase heat dissipation, etc., <snip> Again, this
makes more sense for bikes than for cars.<<<

Brakes on bikes DO offer up some unique problems and solutions.  At the
"Barber Motorsports
Museum" in Birmingham, AL, Race Team Manager, Lee Clark, showed me an
Italian race bike (Gillera?) with some magnificently contrived front brakes.
The disc rotated in the opposite direction to that of the front wheel!   On
the jackstand, I could spin the wheel forward and the brake disc turned
backward . . . .some planetary works inside the hub I guess.  It was
supposed to combat suspension-dive under braking or something . . . I wonder
if it was worth the extra weight and complication?

Tony in Texas

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