Moteri 645 yuruhererekane rwatangiye gukora mu 1965. Kubera ko 567 yageze ku mbibi zayo mu kongera imbaraga z’ifarashi, hakenewe kwimurwa nini; ibi byagezweho no kongera bore kuva kuri 8 + 1⁄2 muri (216 mm) kuri serie 567 ikagera kuri 9 + 1⁄16 muri (230 mm) kuri serie 645, mugihe ikomeza ubwonko bumwe nuburebure. Mugihe ikariso yahinduwe kuva murukurikirane 567, moteri 567C hanyuma nyuma (cyangwa moteri 567 zahinduwe zigera kuri 567C, rimwe na rimwe zitwa moteri 567AC cyangwa 567BC) zishobora kwakira ibice bya serivise 645, nko guteranya ingufu. Ibinyuranye, moteri ya 567E ikoresha 645E ikurikirana hamwe nimbaraga 567 ziteranya.

Moteri zose 645 zikoresha imizi ya Roots cyangwa turbocharger yo gushakisha silinderi. Kuri moteri ya turbuclifike, turbocharger itwarwa na gare kandi ifite clutch irenze urugero ituma ikora nka firime ya centrifugal kumuvuduko muke wa moteri (mugihe gazi ya gazi nubushyuhe byonyine bidahagije kugirango itere turbine) hamwe na turbucluberi yuzuye gusa. ku muvuduko mwinshi. Turbocharger irashobora gusubira mubikorwa nka supercharger mugihe gisabwa kwiyongera kwinshi mumashanyarazi asohoka. Nubwo bihenze kubungabunga kuruta ibihingwa byangiza imizi, EMD ivuga ko iki gishushanyo cyemerera "kugabanya" gukoresha lisansi n’ibyuka bihumanya ikirere, kunoza imikorere yo mu butumburuke bwo hejuru, ndetse no kwiyongera kugera kuri 50 ku ijana by’imbaraga nini zapimwe hejuru ya moteri ikoreshwa na Roots kuri kimwe kwimura moteri.