Injin radial nau'i ne na injin konewa na ciki wanda aka jera silinda a cikin wani tsari da'ira a kusa da crankshaft na tsakiya, mai kama da kashin ƙafar ƙafa. Sunan "radial" yana nufin tsarin radial na silinda. Wannan ƙirar tana ba da damar injin ɗin ya zama ƙarami kuma yana da ma'aunin ƙarfi-zuwa nauyi. chamber da piston. Ana haɗa pistons zuwa tsakiyar crankshaft ta hanyar haɗa sanduna, waɗanda ke juyar da motsi na piston zuwa motsi na juyawa na crankshaft. Sa'an nan tsakiyar crankshaft yana tuka injina ko wasu na'urori.An yi amfani da injunan radial sosai a cikin jiragen sama a farkon karni na 20, musamman a cikin jiragen sama kamar mayakan yakin duniya na biyu da masu tayar da bama-bamai. An san su da amincin su, babban ƙarfin wutar lantarki, da iya aiki a tsayin tsayi. Duk da haka, tare da ci gaban injin turbin gas, injin radial ya zama ƙasa da ƙasa a cikin jiragen sama na zamani. wasu motoci na musamman.