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Studs and Al vs. Fe rotors

Studs etc...
>Graydon brings up a good point....Do only the Germans and Swedes use
>bolts? I don't recall the problem with English cars, nor Italian. Any
>guesses as to why?
>Perci Hala

My Fiat Spider uses bolts, along with four locating studs.  As far as I 
Lancia too uses the same setup.  Perhaps Alfa's too.

Al vs Fe Rotors...
>From: Jeremy R King <kingjer@eng.auburn.edu>
>Ok.  After much prodding, I've finally done "THE MATH".  Please keep in
> deleted
> guarantee you that 1/2% DOES NOT MAKE AS MUCH AS A FOOT DIFFERENCE in
> braking distances between the Viper and the Prowler.  Probably not > > 
> even an inch.  <stuff deleted>
Assuming stopping distances are linearly proportional (and all other 
things being equal), a 0.5% improvement to a 200ft stopping 
distance is 1ft.

>From: Jeremy R King <kingjer@eng.auburn.edu>

>Actually this isn't wholly wrong, simply misstated.  Instead of the 
>sentence saying "the overall normal force" will be bigger, it should
>read, "the bigger the resulting frictional force."  You're right in the
>fact that the normal force doesn't change (ie the amount of pressure on
>the brake pedal).  But a bigger pad with the same pedal pressure applied
>will generate a larger resulting frictional force (stopping force)
>because of the normal force being integrated over the whole pad surface.
>Simple mis-wording.

While integrating over area, the force that should be used is the normal 
force per unit area.  The bigger the pad, the smaller the normal force 
per unit area is (for the same normal force).

Byas Nambisan