914/6 rear caliper spacers, one solution Options

[michel richard]

In the process of restoring my 914/6, I want to have vented rear rotors, mostly because I'm going to have a big engine, but also because I think it's kinda cool.

The stash of parts I bought from Jon Lowe contained some rebuilt original 914/6 rear calipers.

It also contained some good condition 911 front calipers "A" calipers I think: 3 inch bolt spacing, steel, and with a spacer. They had 48 mm pistons.

To build rear calipers that have a spacer, there is one recipe that uses the spacers from the rear of 911 mid-year calipers, as well as other hardware. Those spacers are 10 mm. I don,t have such calipers and initial attempts at getting some were unfruitlful.

So, I took the spacers from the front calipers that I have, but they're 7.5 mm thick.

[michel richard]

and bolted up.

As far as I'm able to measure, the two spacers clamped together end up being 10.3 mm thick. Close enough.

I still need to find some 7mm bolts that are 70 mm long. There's a good hardware store that I use, in town, but they did'nt have any in stock. Apparently they can get me some, in socket head format.

Also, the spacers have 8mm holes in them, but the 914-6 rear caliper uses 7 mm hardware, as noted above. Does anybody know the hole size in the spacers for the mid-year rear 911 calipers ?

Couple more things I will need will be the little rubber O-rings and the retainer spring.