Dee ihe na-aga n'ihu maka paragraf a - N'oge Lotus na Clark jiri ụgbọala atọ dị iche iche na engines. Lotus 43 rụrụ nke ọma na mmeghe South African Grand Prix, yabụ Clark jiri Lotus 33 ochie na Monaco Grand Prix na-esote, na-ala ezumike nká na nkwụsịtụ nkwụsị. Lotus malitere mkpakọrịta ya na Ford-Cosworth. Ụgbọala mbụ ha, Lotus 49 nke nwere igwe F1 nke kachasị nwee ihe ịga nke ọma n'akụkọ ihe mere eme, Ford-Cosworth DFV, meriri agbụrụ mbụ ya na Dutch Grand Prix
, nke Clark na-anya. O jiri ya merie ọzọ na British, United States na Mexico Grand Prix; na, na Jenụwarị 1968, na South African Grand Prix.