Le Mans revised the 4 seat regulation in 1932, raising the displacement limit on two-seaters to 1500cc from 1100. The spirit of the original 4-seater rules was also compromised by the bodies of the Sommer Alfa and the Bugattis, which were more akin to 2+2 seating than true 4-seaters. However, they were allowed to run, probably because of the prestige of Bugatti with the French organizers. Can someone enlighten me as to the evolution of the rules by year which ultimately allowed 2-seaters of any displacement?
Many thanks.