Za a iya cewa injin shi ne mafi muhimmanci a cikin mota, kuma tsarinsa yana da tasiri sosai ga aikin motar. Ga motoci, da layout na engine za a iya kawai raba uku iri: gaba, tsakiya da kuma raya. A halin yanzu, yawancin samfuran da ke kasuwa suna amfani da injunan gaba, kuma injunan da ke kan tsakiya da na baya ana amfani da su ne kawai a cikin ƴan motocin wasan motsa jiki.

Injin gaba yana gaban gatari na gaba. Amfanin injin gaba shine yana sauƙaƙa tsarin watsa motar da tuƙi. Musamman ga nau'ikan tuƙi na gaba waɗanda a halin yanzu ke mamaye cikakkiyar al'ada, injin ɗin yana watsa wutar lantarki kai tsaye zuwa ƙafafun gaba, yana barin madaidaicin tuƙi. An rage hasarar watsa wutar lantarki, haka kuma an rage wahala da rashin gazawar injin watsa wutar lantarki.

Injin da aka saka a tsakiya, wato injin yana tsakanin gaba da baya na abin hawa, kuma gabaɗaya kokfitin yana nan gaba ko bayan injin ɗin. Ana iya cewa dole ne motar da ke tsakiyar injin ta zama motar ta baya ko kuma mai ƙafa huɗu.

Lokacin da mota ke juyawa, duk sassan motar za su fita daga kusurwa saboda rashin aiki. Injin shine mafi girman sashi, don haka ƙarfin injin a jikin motar saboda rashin kuzari yana da tasiri mai mahimmanci akan tuƙi na motar a kusurwa. Siffar injin tsakiyar injin shine sanya injin tare da mafi girman inertia a tsakiyar jikin abin hawa, ta yadda nauyin rarraba jikin abin hawa zai iya zama kusa da ma'auni mai kyau. Gabaɗaya magana, kawai waɗancan manyan motocin motsa jiki ko motocin motsa jiki waɗanda ke kula da tuƙin jin daɗi suna amfani da tsakiyar injina.

Tabbas, injin da ke tsakiya shima yana da nasa kurakurai. Saboda injin da aka saka a tsakiya, ɗakin yana kunkuntar kuma ba za a iya shirya shi da ƙarin kujeru ba. Bugu da kari, saboda direbobi da fasinjoji sun yi kusa da injin, amo yana da ƙarfi. Duk da haka, mutanen da kawai ke bin aikin tukin mota ba za su ƙara damu da waɗannan ba, kuma wasu ma sun fi son jin kurin injin.
Gabaɗaya magana, mafi kyawun injin da aka saka na baya shine sanya injin a bayan gatari na baya. Mafi wakilci shine bas, kuma akwai ƙananan motocin fasinja kawai tare da injin da aka saka a baya. Mafi wakilci shine Porsche 911, kuma ba shakka mai wayo Shi ma injin baya ne.