When were Group 2 Arches actually first used


  1. Good morning,

    I am building a 1962 Austin Mk1 for Historic Racing in South Africa. One of the things I would like to know is in which year Group 2 arches were actually used for the first time. So far I understand that it was post 1966.

    Can anyone actually confirm this date or hopefully tell me it was pre 66.


    Colin Ritchie

  2. imported post


    According to the Homologation Sheet – wing extensions

    are dated 1st. March. 1968. The sheet is no: 5028/7/5.

    I run an 'S' in the H.S.C.C. Historic Saloons and the cut off date is 1966, therefore arches are not permitted. I can get 4-1/2 Minilife under the arch.

    Regards. Colin.

  3. imported post

    Not having homologation papers these days, I suspect the arches specifically homologated in 1968 are wider arches than the original Gp2 arches. The Gp2 arches first used under the new Appendix J that started 1.1.66. didnot require homologation as they were part of the modifications freely allowed under the then new Appendix J Gp2. I understand it was a slightly 'grey' area and FIA confirmation was obtained that the small extensions, used 1966 onwardswere allowed.

    As already mentioned in an earlier post, the only arch extensions used prior to 1966 in International events were in Gp3(which under the old Appendix J covered both GT cars and saloons modified beyond Gp2).

  4. imported post

    are they actually called'group' 2/3 arches.

    I thought they were GRP 2/3, GRP meaning Glass Re-Enforced Plastic (aka fibreglass)and the number being their width in inches.

    Just curious, dont often venture down here:D

  5. imported post

    They were actually not called anything in period – other than 'wheel arch extensions'.

    GRP may have been a term used within the manufacturing industry but it was 'fibreglass' to everyone else then.

    'Group 2' in the original question refers to Appendix J of the Sporting Code of the FIA (or CSI in those days, then later FISA, then later still FIA).

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