 Rudzi urwu rwaiva rwokutanga rweAmerican Championship Car rwakakunda nemotokari ine injini yekumashure. Jim Clark neChikwata cheLotus vakanga vapedza vari vechipiri paIndianapolis 500 ya1963pashure pokukakavadzana kwakapoteredza kusava nechiziviso chakasviba chomukundi Parnelli Jones, ane motokari yakanga ichidonha mafuta. Colin Chapman neChikwata cheLotus vakasarudza kudzokera kumakwikwi eChampion Car kuMilwaukee neTrenton gare gare mugore. Motokari dzeLotus dzine injini yokumashure dzakatonga mupurogiramu yokurovedza uye mumakwikwi okutanga, dzichipfuura rekodhi yomumugwagwa wacho nesekondi imwe. Munhangemutange yacho, Clark akatungamirira mumakomba ose 200 uye akapoteredza nhandare yose, kunze kwomugove wechipiri A. J. Foyt. Mumwe waClark Dan Gurney akapedza ari wechitatu, achirwisana nekutadza kupfura. 