[s-cars] Woah! pics link

[Eric Phillips]

Scott,

I understand that, and have made those disclaimers previously.
Speaking in generalities sometimes doesn't lend itself to describing
everywhere where things *could be* different.

The posts would be book-length.  :)

I'd love to be able to run Porsche rotor rings, on nice, strong, steel
hats (with a purty anti-corrosion treatment of some sort) that would
work with the RS2 brackets as they come from Audi (no machining.)

I would buy that set-up in a heartbeat - and re-use the hats for as
long as they didn't show signs of deterioration.  In addition, a
turn-key set-up might get folks into a situation where they could get
better braking, use known-good factory parts, and not have to worry
about any issues with aluminum in a high-stress, heat-cyling and
corrosion-prone environment.

I'd bet the hats could be cast, if the the stock alloy was right.

Eric

On 7/20/07, QSHIPQ at aol.com <QSHIPQ at aol.com> wrote:
>
> Depends on how you make the bracket, and out of what Eric.  I've got a
> couple dozen of the Big Red kits running around right now, that uses a huge
> block of tempered Al billet, and none of them are showing any signs of
> fatigue (as far as I know) or stress cracking.  I don't agree that steel is
> hard to fabricate, you get good tempered aluminum, it eats up cutting bits
> really fast (our machinist was swearing).  We didn't use Aluminum for
> economy (it was way more than the steel in price for the billet), Carl and I
> used that for a weight target.  IOW, the total weight of the G60 anchors was
> ~33lbs IIRC, the weight of our big red kit was 32 and change, including
> 345rotors.
>
> I just don't see all the fancy cuts in the aluminum on the ECS bracket not
> one of the causes of the problem.  I also wonder if some of this is due to
> the lower deck height of the S caliper vs the Turbo Caliper.  If the design
> of the bracket was to use a fastener for the turbo caliper, and someone used
> an S caliper, the bolt could bottom out.  IIRCII, even if you 'hole tap it'
> the standard metric 12mm Allen isn't threaded far enough up on the shank to
> not cause some problems.
>
> It's been a while since I looked at all this, Carl and I stopped producing
> the kit ~2000.  That said, I just serviced a set of rotors last fall on a 10
> yo kit, and the brackets are still crack free.  The rotor hats tend to be a
> problem, but IME, all AL rotor hats with recessed mounting bolts are a
> problem.  BTST on a lot of different kits.
>
> My .02
>
> Scott J
>
>
> In a message dated 7/19/2007 10:54:50 P.M. Central Daylight Time,
> gcmschemist at gmail.com writes:
> Ah, but then there's "fatigue limit"
>
> Aluminum doesn't have one.  Steel does.  IOW, at a certain level of
> bending (stress), you can bend a steel part forever without fatigue.
> Not so with aluminum.
>
> Steel is hard to fabricate, while aluminum is frightfully easy.
> Aluminum is often a very economical choice for parts-making.