Izimoto zikadizili zishiye umbono omubi emiqondweni yabantu, kodwa ubuchwepheshe bukadizili sebuthuthukisiwe kudala ukuthi buhlanzeke, bube namandla, kanti kwezinye izimo izinjini zikadizili zinenzuzo enkulu kunezinjini zikaphethroli. Ihlanzekile futhi i-eco-friendly ngenkathi isalondoloza ukusebenza okuqinile. Ake sikuhlaziyele umehluko phakathi kwezinjini zikaphethiloli nezidizili.
Izinjini zikadizili nophethiloli zombili ziyizinjini ezivuthayo zangaphakathi, okusho ukuthi zombili zifaka uphethiloli enjinini, ziyixube nomoya, ziyicindezele, ziwuthungele ngezindlela ezahlukene, bese kwehlisa amapiston ukuze ijikise i-crankshaft, exhunywe ku- ukudluliswa kwemoto , futhi ekugcineni uphendule isondo. Iphiston libe selihambela phezulu kusilinda, liphusha amagesi avuthayo aphume enjinini kanye nepayipi le-exhaust njenge-exhaust, futhi lo mjikelezo uphindaphindwa kaningi ngomzuzwana ukuze kuzuzwe injongo yokukhipha amandla ngokuqhubekayo.
Umehluko omkhulu phakathi kwezinjini zikadizili nezikaphethroli yindlela ezixoshwa ngayo. Enjinini kaphethiloli, umoya nophethiloli kuyacindezelwa, futhi ezindaweni ezibucayi emjikelezweni, ipulaki ye-spark ithungela ingxube. Kodwa enjinini kadizili awekho ama-spark plugs, kunalokho, lapho udizili nomoya kumpintsheka ngokwanele, ukucindezela okudlulele kukhiqiza ukushisa okwanele ukwenza ingxube izishise yona. Lokhu kubizwa ngokuthi "i-compression ignition" futhi kuyisisekelo sokuthi izinjini zikadizili zisebenza kanjani. Izinjini zikaphethiloli nazo zingasebenzisa i-compression ignition, kodwa ngomphumela enjini ngokwayo, yizinjini zikadizili kuphela ezingayisebenzisa kahle.
