Kammala wannan jumla: A cikin 1966, FIA ta ninka girman injin daga 1.5 zuwa 3 lita, wanda ya ga motocin sun yi tsere da sauri a kan waƙoƙi da kayan aikin da ba a canza ba tun kafin Yaƙin Duniya na II. Wannan ya haifar da haɗarin mutuwa da yawa. Mutuwar tauraron dan wasan Chapman Jim Clark a Hockenheimring a tseren Formula Two a shekarar 1968 ya kasance wani juyi: wasu direbobi, ciki har da maye gurbin Clark na Lotus, Jochen Rindt, da kungiyar Grand Prix Drivers 'Association (GPDA), sun fara tambayar lafiyar wasan. Rindt da kansa an kashe shi a lokacin horo a
1970 Grand Prix na Italiya; an ba shi lambar yabo ta direbobi a wannan shekarar.