Maziko osiyanitsa mphete za pamwamba kapena zophatikizika ndi mphete ya pisitoni ndikuti mphete yapamwamba imakhala yowala, yoyera, komanso yokhuthala, ndipo mphete ya comp ndi yakuda, yakuda, komanso yoonda. Ndiye kuti, mphete yapamwamba ndi yoyera yasiliva ndipo mphete ya comp ndi yakuda. Mphete yam'mwamba imakhala yowala kuposa mphete ya comp, ndipo mphete yapamwamba ndi yokhuthala. Mphete za comp ndi zoonda.

Mphete ya pistoni idzakhala ndi chizindikiro, ndipo nthawi zambiri mbali yomwe ili ndi zilembo ndi manambala imayang'ana mmwamba. Mphete ya pistoni ndiye gawo lalikulu la injini yamafuta. Imasindikiza gasi wamafuta ndi silinda, pistoni, ndi khoma la silinda. Ma injini a petulo ndi dizilo ali ndi mafuta osiyanasiyana, kotero mphete za pistoni zomwe zimagwiritsidwa ntchito ndizosiyana. Ntchito zinayi za mphete ya pisitoni ndi kusindikiza, kuwongolera mafuta (kusintha mafuta), kuwongolera kutentha, ndi chitsogozo. Kusindikiza kumatanthawuza kusindikiza gasi kuti gasi yemwe ali m'chipinda choyaka moto asatayike kupita ku crankcase kuti matenthedwe aziyenda bwino. Kuwongolera mafuta ndikupukuta mafuta owonjezera opaka pakhoma la silinda ndikuphimba khoma la silinda ndi filimu yopyapyala yamafuta kuti muwonetsetse kuti mafuta abwinobwino. Kuwongolera kutentha ndiko kuyendetsa kutentha kuchokera pa pisitoni kupita ku liner ya silinda kuti muzizizire.