[s-cars] G60/brake threads... first-order system factors?

[Theodore Chen]

--- "Robin St.Clair" <uberseehandel at yahoo.com> wrote:
> Scott
> Your reply to Leigh is innaccurate in several
> significant points.
>
> The Porsche rotors are not cross drilled, the holes
> are cast in, this is described by Porsche, and SHW, as
> 'pierced' in English - think nipples as an aide
> memoire.

yes, and they're also heavier because of the additional internal
reinforcement required.

> Contrary to your assertions, the Porsche factory does
> used pierced rotors in race applications, I have some
> current season Supercup rotors sitting here (R
> 996.351.409.9J, R 996.351.410.9J, R 996.352.405.90,
> and R 996.352.406.90), additionally I have several
> sets of 993 GT1 long distance racing rotors, similarly
> pierced. These are all rotors supplied and used by the
> Porsche boys - if you doubt me, pick up the phone and
> call Weissach, I'll even give you a DDI number or two
> if you still have doubts.

how deep are their pockets?  how often do they replace those
rotors?  that's basically a "replace every race" proposition that
only well-funded teams/owners can afford.  club racers learn pretty
quickly that plain rotors are cheaper and last longer.

> Experience has shown that anything less than
> a diameter of 4 inches is hardly worth the effort.
> After some time in a wind tunnel (with a rolling
> floor), I hope to have a roadgoing solution.

marine bilge fans move a lot of air through the ducts.
you can get away with a smallish duct if you use fans,
but the fans may not be legal in your race class.

-teddy


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