Ntawm qhov tseem ceeb ntawm kev hnav tsis kam ntawm piston pas nrig: Niaj hnub no, nyob rau hauv ntau qhov kev lag luam, nws yog ib txwm sib cais los ntawm kev ua haujlwm ntawm cov khoom siv. Nyob rau hauv tib txoj kev, kev khiav hauj lwm ntawm cov cuab yeej yog inseparable los ntawm lub zog ntawm lub piston system. Lub sijhawm no, tus pas nrig piston tseem ceeb heev. Nyob rau hauv txoj kev loj hlob sai ntawm kev lag luam, txhua yam khoom yuav tsum tau ua raws li lub sijhawm ntawm lub sijhawm txhawm rau txhawm rau txuas ntxiv mus thiab ua raws li kev txhim kho ntawm kev lag luam no. Nws yog ib qho tseem ceeb heev uas yuav tsum tau xaiv qhov tsim nyog piston pas nrig. Thaum xaiv cov khoom seem tam sim no, qhov yuav tsum tau xav txog yog qhov zoo ntawm cov khoom. Tsuas yog thaum qhov zoo dhau lawm, cov khoom seem no tuaj yeem siv tau zoo.
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