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.

[lapuwali]

QUOTE (flesburg @ Nov 3 2005, 01:44 PM)

I was always under the impression that 914-6 rear rotors were solid, and that the calipers were (?) and fitted with emergency brakes similar to or the same as 914-4's. I did not know that a vented rear rotor was ever installed on a 914-6. I gave up the emergency brake on my car years ago. We use 914-6 solid rear rotors, and stock 914-4 front calipers with a little home made spacer to center the caliper around the rotor. We are running late 930 rotors and calipers in the front, and a 23mm master cylinder, and can set bias so the front brakes lock just before the rears. We do not wear rear pads out as fast as front pads. They seem to work well. I have thought about some fancier set up for the rear, but am not convinced that it would be anything other than bling bling. We try to spend out money on things that will make the car lighter and/or faster.

The lower a car, the less weight transfer there is under braking. Especially on a car with a fairly low CG to start with, and a static rearward weight bias, the rear brakes do a lot more on the 914 than they do on many other cars. If you're not overheating your existing solid rear rotors, then there's no need to go to vented rotors. Certainly the factory felt the need to use them even on a 1900-ish lb 914 with under 200hp.

People love fitting front calipers with bigger pistons, so they need to fit rear calipers with bigger pistons to compensate, and thus lose their e-brakes. I don't know of anyone who's actually tried to use stock front and rear calipers with widening spacers for vented rotors. You'd keep the e-brake, and you'd probably be able to actually use an adjustable prop valve rather than a T.