Tine boka revanyengeri vehunyanzvi vakaita mukutonhora kugadzirwa kwePiston zvindori zvine hombe cylinder diamita, uye ivo vane mhosva yehunyanzvi hwekusimbisa kwehunyanzvi hwekambani. Kubva pane zvigadzirwa zvekushandisa zvinopinda zvezvigadzirwa zvichisiya mafekitori, maitiro emazuva ano manejimendi anogamuchirwa kuti aongorore kunaka kwechibatanidza chimwe nechimwe nekudzivirira zvigadzirwa zvekuyerera kusvika kune inotevera maitiro. Iyo kambani inoita kuti isimbe-yakanyanya-kuongorora, yekuzvidzora, kuongorora kwekupedzisira uye kuongororwa kwekupedzisira, uye kuchengeta zvinyorwa zvekutevera zvekutevera kuti uve nechokwadi chekuti piston yega ye piston ichisiya fekitori inowoneka.