914 rear caliper need advice, vented rear rotor Options

[jim dorociak]

I have fresh replated, and rebuild 914/4 rear calipers and thought I would run 911SC vented rear rotor, am running 911 Carrera front vented rotors and figured easy upgrade for the rear. I got spacer blocks from rear 911 calipers, but upon disassembly of the 914/4 calipers I discovered the bolt holes do not line up properly for the spacer blocks I already bought. Does anyone make a kit of spacer blocks for 914/4 to allow a vented rear rotor to be used? I already turned down the overall diameter of the vented rear rotor to 914 size. Trying not to purchase 914-6 rear calipers because of the cost.

Help please with some information and knowledge from you guys.

Thanks in advance. Jim Dorociak. jdorociak@gmail.com

[gandalf_025]

This, according to PMB…

That said, we have the spacer kits (for both 914-6 calipers and 914-4 calipers) and, if you want to space them out, and use vented 911 rotors, you'll need about 4.5mm of washers under the ears and, it's best to get longer mounting bolts at that time as well. It's not a 911E part... all 911's have them from 1970 through 1983. It's a rear M-Caliper spacer and fasteners. For the -4 calipers, it's a kit we developed for those specifically as they have a totally different profile and different (M7) fasteners. Also, a 911 rotor does not bolt right up (spacers needed as described) nor would it need to be shaved with a real 914-6 caliper. With a spaced 914-4 caliper you need to bring the diameter down to 281mm. Both calipers would need the 4.5mm worth of spacers under the ears to get them to align with the 911 rotors offset. Also, most trailing arms don't allow a 4-5mm backspacing of the caliper without modifying the inner venting clearance adjustment tube.