Quote:
There was only 1 size homologated disc for Group 1. It is a ventilated version of the original as used on police spec cars. There is a larger disc with AP 4 pot caliper homologated for group 2.
There certainly appear to be two disks homologated for group 1, the original disk dimensions of which are on page 7 of the recognition form (number 5542), and are 9.5 mm thick, and the vented disks on page 22, which are 19.05 mm thick. I assume that means some change to the calliper as well.
It's these vented disks (and their callipers) that I can't see are covered for group 1 by anything in appendix J 1976 - unless there were 5000 Dolomite Sprints with vented disks made in 1976 (the 12 months before their approval), which I assume would be better known about. And there's been enough talk about the need of vented front disks on this site that this fact should have been mentioned already. Hence, it seems to me that they were snuck in along with the dual circuit hydraulics, and Jeroen is correct if that's what's meant by "creative homologation".
However, none of that changes the fact that if HS8s or Webber 48s were being allowed through scrutineering in 1977-8, then either the British Saloon Car series can't have been Group 1 at the time, despite what's written about it, or something else odd was happening in scrutineering - there's just no clause in Appendix J 1976 for alternative carbs and manifolds for Group 1.
Graham