Isisekelo sokuhlukanisa izindandatho ezingaphezulu noma ezihlangene eringini yepiston ukuthi iringi yangaphezulu igqamile, imhlophe, futhi iwugqinsi, futhi iringi ye-com imnyama, imnyama, futhi izacile. Okusho ukuthi, indandatho ephezulu imhlophe ngesiliva kanti indandatho ye-com imnyama. Iringi yaphezulu ikhanya kakhulu kuneringi ye-com, futhi iringi yangaphezulu ishubile. Ama-com rings mancane kakhulu.

Iringi yepiston izoba nophawu, futhi ngokuvamile uhlangothi olunezinhlamvu nezinombolo lubheke phezulu. I-piston ring iyingxenye eyinhloko yenjini yamafutha. Ivala igesi yamafutha nge-cylinder, piston, kanye ne-cylinder wall. Izinjini zikaphethiloli nezidizili zinezindawo ezihlukene zikaphethiloli, ngakho izindandatho zepiston ezisetshenziswayo nazo zihlukile. Imisebenzi emine yeringi ye-piston ukuvala, ukulawula uwoyela (uwoyela wokulungisa), ukuqhutshwa kokushisa, kanye nokuqondisa. Ukuvalwa kubhekisela ekuvaleni igesi ukuze kuvinjwe igesi egunjini lomlilo ukuthi ingavuzi kukhrenka ukuze kuthuthukiswe ukusebenza kahle kokushisa. Ukulawula uwoyela ukusula uwoyela wokugcoba oweqile odongeni lwesilinda ngenkathi uvala udonga lwesilinda ngefilimu kawoyela emincane ukuze kuqinisekiswe ukuthambisa okuvamile. I-Heat conduction yindlela yokushisa ephuma ku-piston iye ku-cylinder liner ukuze iphole.