Piston e sebetsa tlas'a mocheso o phahameng, khatello e phahameng, lebelo le phahameng le mafura a fokolang. Piston e kopane ka ho toba le khase e phahameng ea mocheso, 'me mocheso oa hang-hang o ka fihla ho feta 2500K, ka hona, mocheso o tebile,' me maemo a ho senya mocheso a futsanehile haholo, kahoo mocheso oa piston o phahame haholo ha o sebetsa. holimo ho bophahamo ba 600 ~ 700K, 'me kabo ea mocheso e sa lekana haholo; Bokaholimo ba piston bo na le khatello e ngata ea khase, haholo-holo khatello e phahameng ea ho sebetsa, enjene ea peterole ho fihla ho 3 ~ 5MPa, enjene ea diesel ho fihla ho 6 ~ 9MPa, e etsang hore piston e be le tšusumetso, 'me e mamelle karolo ea khatello ea lehlakore; Piston ka silindara ka lebelo le phahameng (8 ~ 12m/s) e khutlisetsang motsamao, 'me lebelo le lula le fetoha, le hlahisang matla a maholo a inertial, e le hore piston e be tlas'a mojaro o moholo o eketsehileng. E sebetsa tlas'a maemo a thata joalo, piston e tla holofala le ho potlakisa ho khathala, hape e tla hlahisa meroalo e eketsehileng le khatello ea mocheso, ha e ntse e chesoa ke lik'hemik'hale ke khase.