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Old 7 Feb 2019, 15:30 (Ref:3882429)   #2
Mike Bell
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Originally Posted by Anyopenroad View Post
How did the historic racing world settle on 1966 as its before/after year?

My non-expert eye sees the Ford GT40, Can-Am monsters and winged F1 cars starting about then. Are these simply visible examples of significant technological advances which make 1966 such an important crux point?

Historic racing is spilt into many age groups, stopping at 1990. That's when the FIA decided technological advances were too big. This is from FIA Appendix K regulations....

3. DATE CLASSIFICATIONS AND DEFINITIONS 3.1 A car will be dated by the specification of that car and not necessarily by the date of build. 3.2 Dating periods are as follows:

A) before 1/1/1905.
B) 1/1/1905 to 31/12/1918.
C) 1/1/1919 to 31/12/1930.
D) 1/1/1931 to 31/12/1946.
E) 1/1/1947 to 31/12/1961 (from 1/1/1946 for Grand Prix and Formula 3 cars and up to 31/12/1960 for single-seat and twoseat racing cars).
F) 1/1/1962 to 31/12/1965 (from 1/1/1961 for single-seat and two-seat racing cars and up to 31/12/1966 for Formula 2), excluding Formula 3 and single engine-make Formulae.
GR) 1/1/1966 to 31/12/1971 for single-seat and two-seat Racing cars
(1/1/1964 to 31/12/1970 for Formula 3).
G1) 1/1/1966 to 31/12/1969 for homologated Touring and GT cars.
G2) 1/1/1970 to 31/12/1971 for homologated Touring and GT cars.
HR) 1/1/1972 to 31/12/1976 for single-seat and two-seat Racing cars (1/1/1971 to 31/12/1976 for Formula 3).
H1) 1/1/1972 to 31/12/1975 for homologated Touring and GT cars.
H2) 1/1/1976 to 31/12/1976 for homologated Touring and GT cars.
IR) 1/1/1977 to 31/12/1982 for single-seat and two-seat Racing cars (excluding Group C) and 1/1/1977 to 31/12/1985 for 3-litre F1.
I) 1/1/1977 to 31/12/1981 for homologated Touring and GT cars.
IC) 1/1/1982 to 31/12/1990 for Group C and IMSA cars.
JR) 1/1/1983 to 31/12/1990 for single-seat and two-seat Racing cars (excluding 3 litres F1 cars 1/1/1983 to 31/12/1985).
J1) 1/1/1982 to 31/12/1985 for homologated Touring and GT cars.
J2) 1/1/1986 to 31/12/1990 for homologated Touring and GT cars.
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