Mphete ya Piston ndi mphete yachitsulo yomwe imayikidwa poyambira pisitoni. Pali mitundu iwiri ya mphete za pistoni: mphete yoponderezedwa ndi mphete yamafuta. Mphete yopondereza itha kugwiritsidwa ntchito kusindikiza mpweya wosakanikirana woyaka muchipinda choyaka. Mphete yamafuta imagwiritsidwa ntchito pochotsa mafuta ochulukirapo mu silinda.
Mphete ya pisitoni ndi mtundu wa mphete zotanuka zachitsulo zomwe zimakhala ndi mawonekedwe okulirapo akunja. Imasonkhanitsidwa munjira ya annular yomwe ikugwirizana ndi mbiriyo. Mphete za pistoni zobwerezabwereza komanso zozungulira zimadalira kusiyana kwapakati pakati pa mpweya kapena madzi kuti apange chisindikizo pakati pa bwalo lakunja la mphete ndi silinda ndi mbali imodzi ya mphete ndi poyambira.
Mphete ya pistoni ndiye gawo lalikulu la injini yamafuta. Imasindikiza gasi wamafuta pamodzi ndi silinda, pistoni ndi khoma la silinda. Injini zamagalimoto zomwe zimagwiritsidwa ntchito nthawi zambiri zimakhala ndi mitundu iwiri ya injini ya dizilo ndi petulo, chifukwa cha magwiridwe ake amafuta ndi osiyana, kugwiritsa ntchito mphete za pistoni sikufanana, mphete ya pistoni yoyambira poponya, koma ndikupita patsogolo kwaukadaulo, mphete ya pisitoni yamphamvu kwambiri. anabadwa, ndi mosalekeza kusintha kwa ntchito injini, zofunika zachilengedwe, zosiyanasiyana zapamwamba pamwamba ntchito mankhwala, monga kupopera mbewu mankhwalawa matenthedwe, electroplating, chrome plating, Gasi nitriding, thupi, zokutira pamwamba, nthaka manganese phosphating mankhwala, kuti ntchito ya mphete pisitoni bwino kwambiri.
