AMortation yolumikizidwaImagwira ntchito pogwiritsa ntchito mafuta owonera zoperekedwa ku mapampu yopaka kuti iyendetse pisitoni yamkati. Pamene pampu itaima, piston imayendera pansi pa gulu la masika, potengera kukhazikika ndikusunga mafuta okhazikika. Voliyumu yotulutsa ndi yolondola, yokhala ndi mitu yolumikizira yomwe imangotulutsa kamodzi pa mafuta. Mphamvu zake zimasokonezedwa ndi dongosolo lazomwe zimachitika, kaya ndi zopingasa kapena zolimba, zapamwamba kapena zotsika, komanso mawonekedwe ogulitsidwa.