Mezue ahịrịokwu na-esonụ: Ọtụtụ ụgbọala na-agba ọsọ n'oge gara aga na-eji engines anọ anọ, ma engine Peugeot nke meriri
Indianapolis 500 nke 1913 bụ injin nwere mmetụta dị ukwuu. Ọ bụ Ernest Henry mere ya, nke a nwere oghere camshafts abụọ (DOHC) nwere valvụ anọ kwa cylinder, nhazi nke ga-aghọ ọkọlọtọ ruo taa maka ịgba ọsọ inline-engine anọ.