Re: [DMCForum] Cross-drilled rotors was Door strut strength?

["Andrei Cular" <acular@xxxxxxxxxxxxxxx>]

While chamfering the edge and tempering helps reduce stress it can not
eliminate it.  The best x-drilled rotors have the holes put in during the
casting process this eliminates discontinuities in the grain structure of
the metal.

The only reason to go to x-drilled on the average D is for looks.  The
holes
are to allow gasses to escape during hard breaking, eliminate break fade.
I
have never had the opportunity to drive my car hardenough to cause fade
but
I don't think it will be an issue for most.  I push my Z and my brothers
944
to the absolute limits and only on the rarest occasion experience break
fade.  And both of these cars have stock rotors and stock calipers.


Andrei




----- Original Message ----- 
From: "Travis Goodwin" <tgoodwin@xxxxxxxxxxxx>
To: <DMCForum@xxxxxxxxxxxxxxx>
Sent: Friday, May 16, 2003 9:01 AM
Subject: RE: [DMCForum] Cross-drilled rotors was Door strut strength?


> Thanks for the heads up Walt. The more I think about it, high
performance
> rotors may not make a lot of sense in my case. I'm a weekend driver and
> travel less that 100 miles a month. So, PowerStops wouldn't make a whole
lot
> of difference in my case. Maybe I'll just go OEM and make the transition
> easier (and less expensive).
>
> > -----Original Message-----
> > From: Walter Coe [mailto:Whalt@xxxxxxx]
> > Sent: Thursday, May 15, 2003 4:01 PM
> > To: DMCForum@xxxxxxxxxxxxxxx
> > Subject: Re: [DMCForum] Cross-drilled rotors was Door strut strength?
> >
> > I ordered PowerStop cross-drilled rotors though SummitRacing who got
them
> > through AutoSpecialty.  Only the front rotors came and the back ones
went
> > on
> > back order for months.  I finally played detective and spoke to the
> > relevant
> > people involved.  Their supply of cross-drilled rotors ran out, and
they
> > sold slow enough that they were not planning on making any more.  At
that
> > time they had two more pair of front rotors and no rear rotors.
> >
> > SummitRacing offered to buy back my front ones, but I decided to try
them
> > out on my car anyway.  In short, they suck!  My only complaint is that
> > they
> > are very noisy but then I'm the only one complaining about PJ Grady's
> > shock
> > absorbers with the high-performance squeak.  These brake rotors make a
> > whirring noise any time the car is in motion even without touching the
> > brake.  It isn't bad enough to make me replace them, but I certainly
> > wouldn't put the same kind of rotor on another car.  Rob Grady told me
> > that
> > he test drove a DeLorean with cross-drilled rotors and didn't want to
deal
> > with them because of the noise issue.
> >
> > One important caveat: not all cross-drilled brake rotors are created
> > equal.
> > The PowerStop ones I got were made to be cross-drilled.  After the
> > drilling
> > process, they were reheated and then zinc plated.  The holes are
chamfered
> > (like funnels) which are supposed to cut down on the noise, but they
are
> > still very noisy.  John Hervey told me that the ones he got were not
> > cross-drilled and then he had someone do the cross-drilling expost
facto.
> > I
> > wouldn't want to trust it, but then maybe John would like to chime in
and
> > explain what he has.  I think the reason why he doesn't want to sell
the
> > fronts or rears separately is because he had them made in complete
sets.
> > If
> > he sold just the fronts then he might have a harder time selling the
rears
> > separately.
> >
> > The cross-drilled rotors I like best are sold by Ed Uding.  He had
them
on
> > display at the Memphis show last year.  This is a much thicker
internally
> > vented rotor that he then cross-drills.  I don't like the idea that he
> > cross-drills them expost facto.  But I do like the idea that they are
> > internally vented.  This should stop most of the whirring noise.  Can
> > anyone
> > who has tired them say?  These rotors are too thick for stock
calipers,
so
> > Ed came up with an adaptor piece that goes between the halves of the
> > caliper
> > making it wider.  What a clever guy!
> >
> > Walt
> >



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