Ga injunan allurar man fetur na carburetor ko throttle body, injunan shigar da man fetur suna nufin layin shigar da man fetur daga bayan carburetor ko throttle body zuwa kafin shigar da kan silinda. Aikinsa shine rarraba iska da man fetur ga kowace tashar shigar da man fetur ta hanyar carburetor ko throttle body.
Ga injunan allurar mai ta iska ko injinan dizal, injin shigar iska kawai yana rarraba iska mai tsabta ga kowace silinda da ake sha. Inji shigar iska dole ne ya rarraba iska, cakuda mai ko iska mai tsabta daidai gwargwado ga kowace silinda. Don wannan dalili, tsawon hanyar iskar gas a cikin injin shigar iska ya kamata ya zama daidai gwargwado. Domin rage juriyar kwararar iskar gas da inganta ƙarfin shiga, bangon ciki na injin shigar iska ya kamata ya zama santsi.
Kafin mu yi magana game da injection manifold, bari mu yi tunani game da yadda iska ke shiga cikin injin. A cikin gabatarwar injin, mun ambaci aikin piston a cikin silinda. Lokacin da injin yana cikin bugun injection, piston yana motsawa ƙasa don samar da injin a cikin silinda (wato, matsin lamba yana ƙarami), don haka bambancin matsin lamba tsakanin piston da iskar waje za a iya samar da shi, don haka iskar ta iya shiga silinda. Misali, an yi muku allura, kuma kun ga yadda ma'aikaciyar jinya ta tsotse maganin a cikin sirinji. Idan bututun allura shine injin, to lokacin da aka fitar da piston da ke cikin ganga na allura, za a tsotse maganin a cikin ganga na allura, kuma injin zai jawo iska zuwa cikin silinda.
Saboda ƙarancin zafin jiki na ƙarshen shan maganin, kayan haɗin ya zama sanannen kayan shan maganin. Nauyinsa mai sauƙi yana da santsi a ciki, wanda zai iya rage juriya yadda ya kamata da kuma ƙara ingancin shan maganin.
