What discs are these?

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hermeticist
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What discs are these?

Post by hermeticist » Tue Mar 12, 2019 2:04 pm

I was cleaning up some spare uprights and happened to measure the discs, because they seemed larger than standard. They are around 255mm (I believe the standard discs are 8.9" or around 226mm). Anyone have any ideas what these might be from? To me they look well past being useable - in particular, the inner seems to have been turned down to provide clearance. As a further piece of information they were supplied with, supposedly, Porsche calipers, I think these are branded as ATE(?)

Pictures for your edification:
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Thank you for your input and attention! :)



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What discs are these?

Post by philhoward » Tue Mar 12, 2019 2:17 pm

Sounds like the Gottfried conversion to me? They may be the matching discs for the calipers - http://www.scimitarweb.co.uk/sgwrs/sear ... che+%2Bate doesn't tell much and sadly Geoff (toomanysabres) is no longer with us. On the flipside, Gottfried is still around - AP756 on here, as is reliant-reviver, of course, who may know more?


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What discs are these?

Post by hermeticist » Tue Mar 12, 2019 2:24 pm

I did wonder and had a short chat with Philip about the Gottfried conversion...



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What discs are these?

Post by hermeticist » Tue Mar 12, 2019 2:25 pm

Thank you (other?) Phil.



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What discs are these?

Post by reliant-reviver » Tue Mar 12, 2019 3:10 pm

I will see if I can dig up the original paperwork. I did have it scanned... now which hard drive is it on that's the question.

BMW E30 M3 rings a bell. But with machining (what I can't say). I note that yours similar to mine (currently stopping a shelf) have an unequal thickness with less meat on the rear face.


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What discs are these?

Post by hermeticist » Tue Mar 12, 2019 7:56 pm

Oh... That makes sense. I'll have a look through my paperwork too... I was under the impression that the calipers and uprights, despite being from the same source, were unconnected. That was until I looked more closely and measured them... originally, I thought they were Metro ventilated..



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What discs are these?

Post by Roger Pennington » Tue Mar 12, 2019 8:26 pm

reliant-reviver wrote:
Tue Mar 12, 2019 3:10 pm
I note that yours similar to mine (currently stopping a shelf)
I presume the shelf is in your stationary cupboard? :wink:


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What discs are these?

Post by chrisgallacher » Tue Mar 12, 2019 8:36 pm

Roger Pennington wrote:
Tue Mar 12, 2019 8:26 pm
reliant-reviver wrote:
Tue Mar 12, 2019 3:10 pm
I note that yours similar to mine (currently stopping a shelf)
I presume the shelf is in your stationary cupboard? :wink:
You're wasted on here Roger. I thought that was quite funny :D


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What discs are these?

Post by philhoward » Tue Mar 12, 2019 9:34 pm

reliant-reviver wrote:
Tue Mar 12, 2019 3:10 pm
I will see if I can dig up the original paperwork. I did have it scanned... now which hard drive is it on that's the question.

BMW E30 M3 rings a bell. But with machining (what I can't say). I note that yours similar to mine (currently stopping a shelf) have an unequal thickness with less meat on the rear face.
If machined it might not be an issue but E30 M3 used a 5-stud fixing. E21 BMW are a possibility I seem to recall when I was doing some perusing of a Brembo catalogue?


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What discs are these?

Post by gtcse8 » Wed Mar 13, 2019 8:45 am

hermeticist wrote:
Tue Mar 12, 2019 7:56 pm
, I thought they were Metro ventilated..
Metro vented will never fit an SS1/T hub without a LOT of work.

Popular conversion now is a Rover Montego/Maestro disc as the bolt PCD is exactly the same so no more drilling extra holes, nor skimming the back of the disc to get it into the calipers.


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What discs are these?

Post by peter freeman » Wed Mar 13, 2019 10:14 am

IIRC Gottfried told me he used Porsche rear discs for his car - from which Porsche I don't know.



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What discs are these?

Post by Old and Slow » Wed Mar 13, 2019 12:25 pm

The rear discs on the 911SC incorporate the drums for the handbrake - don't know if this is important. I could go and take some measurements if required.


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What discs are these?

Post by hermeticist » Thu Mar 14, 2019 12:37 am

Sorry, I meant to say the ventilated discs from the Metro Turbo conversion, which are, I think, no bigger than standard? I have some dim recollection of a BMW 3 series disc being mentioned but I have no real idea. It Would be interesting to know if the Porsche rears are the same size, are they ventilated?



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What discs are these?

Post by AP756 » Thu Mar 14, 2019 2:16 pm

Sorry, I'm a bit late :). My brake conversion was designed for the SS1 and contains following parts:
- front disc: diameter 257mm, thickness 20mm, pot hight 47,4mm (special design based on VW GTI 16V)
- front calipers: Two pot ATE Type S48-20mm (used on Porsche Carrera around 1987)
- rear drums with new wheel cylinders (Ford Sierra 20,64mm diameter)
- brake circuit changed from Hi-split (circuit 1: front + rear, circuit 2: front) to circuit 1 front and circuit 2 rear (improved heat resistance)
- for optimum braking performance the heat shield behind the disc has to be modified
- some brake line adapters to reroot the piping
- adapters (kind of sleeves) to reduce the 12mm holes in the calipers to 10mm to reuse the original bolts
The conversion was developed in 1987/88 and got German TÜV End of 1988. Hope this helps, please ask for more details and hope that I'm not too busy to visit the forum

Bye for now Gottfried


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What discs are these?

Post by Old and Slow » Thu Mar 14, 2019 7:47 pm

hermeticist wrote:
Thu Mar 14, 2019 12:37 am
Porsche rears are the same size, are they ventilated?
Do you still want to know? If so I'll have a look tomorrow morning.


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