[s-cars] Brake Rotor with Big Reds

[Richard Hoffman]

To be fair, the holes are actually cast into the rotor and then machined 
with a radiused transition to the face.  The casting doesn't provide a very 
good surface finish, but by casting the holes in to the rotor it ensures a 
proper grain pattern around the hole to resist  cracking.  They are not 
indestructable, however.  Cracking does happen, but really it is so minor it 
doesn't affect function.

PS there are some Billzcat1 hats coming available soon - only 2 pairs of the 
next 5 pairs I'm making are spoken for - available for Porsche 322x32 rotor 
or any Wilwood using 8x7.00" mounting pattern, 4x108 or 5x112 :) 
(www.billzcat1.com)

TTYL
Richard

----- Original Message ----- 
From: "Theodore Chen" <tedebearp at yahoo.com>
To: <s-car-list at audifans.com>
Sent: Tuesday, May 17, 2005 11:59 PM
Subject: Re: [s-cars] Brake Rotor with Big Reds


> posrche's rotors are more accurately described as "holey" than drilled.
> those holes are cast into the rotor, not drilled, and the rotor is
> designed with extra reinforcing structure to make up for the weakening
> of the rotor caused by putting holes in it.
>
> in a street application, it's for looks.  on race cars, it's more
> functional but most of the 911 GT3s i saw running in ALMS at laguna seca
> recently had slotted rotors with no holes in them.
>
> also, race teams replace the rotors after every race (or every few races 
> if
> they don't have the budget).  are you prepared to do that?
>
> -teddy
>
> --- Greg Johnson <gregsj2 at gmail.com> wrote:
>> Some of you may recall that we (BIRA) created "replirotors" very early
>> on.  Replirotors were Coleman rotors with BIRA hats that replicated
>> the dimensions of the available Audi rotors.  They were mainly created
>> to allow Porsche calipers to fit over four bolt Audis.  Our experience
>> was similar to Haps: Coleman rotors warped too soon.
>>
>> Everyone has a claim/opinion as to whether slots are better than
>> drilled and so forth.  Here's a data point to add to the mix.  Porsche
>> spends about $10 million a year on braking system R&D and it continues
>> to put drilled rotors on all of its street and race cars.
>>
>> Many of you have heard me say this before: if it's good enough for
>> Porsche, it's good enough for me.
>>
>> Greg J
>> BIRA.ORG
>>
>> Hap wrote:
>>
>> >Elijah
>> >
>> >I went through 4 sets of Coleman rotors and they all warped rather 
>> >quickly.
>> >Dave Jones kindly replaced them each time. We tried
>> >
>> >Greg J
>> >BIRA.ORG
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>
>
>
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