Ma injini a 645 adalowa kupanga mu 1965. Pamene mndandanda wa 567 udafikira malire ake pakuwonjezeka kwa akavalo, kusuntha kwakukulu kunafunika; izi zidakwaniritsidwa powonjezera bore kuchokera ku 8 + 1⁄2 mu (216 mm) pamndandanda wa 567 mpaka 9 + 1⁄16 mu (230 mm) pamndandanda wa 645, ndikusunga kukwapula komweko ndi kutalika kwa sitimayo. Pomwe crankcase idasinthidwa kuchokera pagulu la 567, 567C ndi injini zamtsogolo (kapena ma injini 567 omwe asinthidwa kukhala mafotokozedwe a 567C, omwe nthawi zina amatchedwa injini za 567AC kapena 567BC) amatha kuvomereza magawo 645 othandizira, monga magulu amphamvu. Mosiyana ndi izi, injini ya 567E imagwiritsa ntchito chipika cha 645E chokhala ndi magulu 567 amphamvu.

Ma injini onse 645 amagwiritsa ntchito Roots blower kapena turbocharger posakaza masilinda. Kwa injini za turbocharged, turbocharger imayendetsedwa ndi giya ndipo imakhala ndi clutch yopitilira yomwe imalola kuti ikhale ngati centrifugal blower pa liwiro lotsika la injini (pamene mpweya wotulutsa mpweya ndi kutentha kokha sikukwanira kuyendetsa turbine) ndi turbocharger yoyendetsedwa ndi mpweya wokha. pa liwiro lapamwamba. Turbocharger imatha kuyambiranso kuchita ngati supercharger panthawi yofuna kuwonjezeka kwakukulu kwa mphamvu zotulutsa injini. Ngakhale kuli kokwera mtengo kwambiri kukonza kuposa Roots blowers, EMD imati mapangidwewa amalola "kwambiri" kuchepetsa kugwiritsa ntchito mafuta ndi kutulutsa mpweya, kupititsa patsogolo magwiridwe antchito apamwamba, komanso kuwonjezereka kwa 50 peresenti yamphamvu zamahatchi pama injini omwe amawomberedwa ndi Mizu chimodzimodzi. kusuntha kwa injini.