Rear Brake Rotor options Options

[Eddie914]

Worn rear wheel bearings and the concern about 914 CV joint longevity with the torque of the 3.2 liter Carrera engine motivated me to upgrade the rear drive components on my '71 3.2 six conversion.

Previously, I had utilized stock 914 1.7 axles and re-drilled 5 lug hubs used with 911SC rotors, calipers and an 8mm wheel spacer between the rotor and hub. It was difficult to center the rotor and therefore the rotor would at times rub the brake pad retaining pins. The wheel bearings were worn and hard right turns would result in increased rubbing

Here is what the upgrade involved:

- 911SC Transmission output flange (coarse spline)
- 944 Turbo inner CV Joint
- 914 axle with extended spline shoulder
- 944 Turbo outer CV Joint
- 911SC Stub axle
- 914/6 Wheel bearings
- 911T Wheel hub
- 85mm Bullet nose wheel studs
- 911SC Brake rotors
- 911SC Brake Calipers

The brake rotors are still hitting the brake caliper mounting ears. What are the options? Spacers? Washers? Different rotors? Grinding the ears?

What are the diameter, thickness and offset of 914/6 rear brake rotors compared to 911 rear rotors?

How much space is needed between the rotor and mounting ear? Is heat transfer from the rotor to the mounting ear a major concern if the rotor is very close (0.010") to the mounting ear?

I'd like to eliminate the spacer. Fender clearance when running 911 turbo 16 x 9 BBS RA wheels with 245/45/16 tires is minimal. With the old worn rear wheel bearings the clearance was less than minimal under hard cornering, i.e. most of the raised letter on the tires has been worn off!

Thanks

Eddie

[davep]

The spacer between the hub and rotor should be 4mm, 8 is way too much. The 4mm is the difference in offset of the 911 rotor and 914 rotor. Offset is the difference between the inside working face of the rotor and the face that the hub mates to.

[Mueller]

The spacer between the hub and rotor should be 4mm, 8 is way too much. The 4mm is the difference in offset of the 911 rotor and 914 rotor. Offset is the difference between the inside working face of the rotor and the face that the hub mates to.

I have EricS rear vented /4 kit and it came with the 5mm spacers. For SirAndys application, 5mm was not enough (IMG:style_emoticons/default/confused24.gif)

edited post to change 4mm to the correct 5mm (IMG:style_emoticons/default/smile.gif)