Car in bits again...
AO Silver Member
Join Date: Feb 2007
Location: Hampshire, UK
Late Sprint/33 front brakes
Hi guys! I've got another cracking question for ya!
As you know, I am trying to redesign my front suspension uprights. So far I've been working with a combination of Alfasud front wheel bearings and hub (the latter re-drilled for 4 x 108 PCD), tucked into a 1600 Giulia brake disc with ATE calipers.
This seems to fit together nicely, but I can't get the scrub radius down below 40mm, and its the depth of the "top hat" that is stopping me improving this critical dimension.
So, my question, seeing as the late model Sprints and Alfa 33 used an outboard disc brake, with the disc placed over the hub and clamped in place by the wheel bolts, is...
What is the depth of the brake "top hat"?
On the Giulia disc, the dimension is 60mm from the wheel mounting face to the disc face. 40mm depth would allow me to achieve the desired scrub radius of approximately 20mm using a KPI of 12°. But anything less than 60mm would be good.
If the Sprint/33 disc measures up then it would make sense for me to use the hub and bearing assembly from this car as well, and I'll just have to forget about using only parts from the 1970s...
Also, if I did use the Sprint/33 hub, is there enough meat in the flange to drill 4 x 108 PCD, or will my front wheels have to remain at 4 x 98?
Sorry its a bit teccy, but this is really making my brain hurt and I need to find an answer soon!
Alfanauts are GO!!!