914-6 vented rear rotor, Zimmerman or any other cross reference Options

[914Sixer]

I was looking thru the 914-6 competion parts manual to check on vented rear caliper rotors insead of using spacers on hub or washers on the caliper. The part number for those is 901.352.041.12. So I called Porsche and they said they were available from Germany at $275 each.

Does anybody have a cross refference to Zimmerman rotors? So I could see if they are available at a much lower price? 901.352.041.14 is the standard 911 rear vented rotor from 69-on so I am guessing that the .12 makes these special.

Any comments? Thanks, Mark.

[davep]

QUOTE (Mueller @ Nov 3 2005, 03:38 PM)

so how did the factory address the vented rear rotors? was there a direct replacement caliper? did they lose the parking brake and install a front caliper or a 911 rear caliper? or did they resort to spacers/adapters?

The 914/6 GT used regular 914/6 rear calipers that were spaced 10mm. The same spacers as are used in the common 911 rear brake caliper; the two calipers are the same bore and share the outer casting.

The rotor used was a variation on the 911 vented rear rotor that used a different offset to center the rotor in the caliper without spacers. It may also be slightly smaller in diameter, as is the solid 914/6 rotor.

So it was a simple solution: widen the caliper with the available spacers, and a custom rotor to suit.

The front was even more simple: existing rotor with a custom caliper (borrowed from the 908) the bore was slightly bigger, and the pads slightly thicker.

A 20mm master cylinder was commonly used, borrowed from the 911S, but some people adapted the 23mm master.