Re: Why Slot your Rotors (or pads)?

["Brian Haygood" <scirious@hotmail.com>]

I just machined slots into my Passat's new rotors because:

10% - hot gasses escape from pad (I don't race the Passat)
30% - water's surface tension is broken by slots, so pads don't hydroplane
40% - I want to machine stuff to get experience while I can use some of the 
school's machines (and my bits/endmills)
20% - aesthetics

If I were autocrossing this car I'd probably have more justification, and 
having slotted these rotors, I think drilling would be easier, so I'd 
probably do that instead.

Sincerely;
Brian Haygood


>From: T Berk <tberk@mindspring.com>
>Reply-To: tberk@mindspring.com
>To: Brian McGarvey <brianm@zbt62.eastnet.gatech.edu>
>CC: sfwilliams@home.com, Scirocco List <scirocco-l@scirocco.org>
>Subject: Why Slot your Rotors (or pads)?  Was: What's the straight dope on 
>SS brake lines?(long tech response)
>Date: Mon, 10 Sep 2001 19:07:58 -0700
>
>The given reason on why you would slot your rotors,
>(Like these:)
><http://www.newdimensions.com/products/page_2.html>
>
>is to avoid hot expansion gasses from getting in the way of your
>stopping power.
>
>TBerk
>
>
>
>Brian McGarvey wrote:
> >
><snip>
> >
> > moving from solid rotors to vented rotors more than DOUBLES the heat
> > dissapation surface area. allowing the system to cool at faster rate.
> >
> > <personal opinion>
> > I'm not sure what ppl think they are getting w/ slotted rotors other 
>than
> > cool looks but the surface area increase for heat dissapation is very
> > small. I understand there is a train of thought about brake dust, but 
>the
> > gains are marginal at best mostly i believe it is cosmetic.
> > </personal opinion>
> >
><snip>
> >
> > Brian (ranting)
>
> > > Marc wrote:
> > > > This is why you have vented rotors for any
> > > > serious braking setup. And if you are really serious,
> > > > the you have them drilled. Drilled rotors are not
> > > > necessary for street setup though,
>
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