Indlela yokuphatha?
Indlela yokusabalalisa igesi inesibopho sokugeleza kwengxube ye-air-fuel kumasilinda kanye nokususwa kwemikhiqizo evuthayo kuwo.
Isimo sokusebenza kwenjini ukuqinisekisa ukugeleza kwengxube ye-fuel-air kuma-cylinders kanye nokususwa kwemikhiqizo evuthayo kuwo. Le misebenzi ebalulekile yenziwa indlela yokusabalalisa.
Enjinini ngayinye kunezigaba ezihlanganisa okungenani ama-valve amabili (i-inlet ne-exhaust), ngokuvamile amathathu, amane noma amahlanu, kanye nama-actuator awo. Avumela ama-valve ukuthi avuleke lapho i-piston isendaweni efanele kusilinda. Ukwakhiwa kwenjini kanye nesivinini sayo kunquma uhlobo lomshini osetshenziswayo. Enye yezimiso yile 
isidingo sokunciphisa ithonya le-inertia yezingxenye ezihambayo ngokunemba kokuvula i-valve.
Izinhlobo Zezinhlelo Zesikhathi
Uhlobo lokuqala lomshini bekuwumshini wokusabalalisa igesi enevalvu ephansi. Ithathelwe indawo yisixazululo sesimanjemanje - i-valve ephezulu yesikhathi, lapho wonke ama-valve atholakala ekhanda le-cylinder. Lawa ama-valve alengayo abheke phansi. Inzuzo yalesi sixazululo inkululeko yokufaka ama-valve anama-diameter amakhulu ngokwanele. Ukungalungi inani elikhulu lezingxenye kanye nesidingo sokuqinisekisa ukuqina okwanele kwezakhi eziphakathi kokudluliswa kwamandla. Lolu hlobo lwemishini yesikhathi luvame ukusetshenziswa ezinjinini zezimoto zabagibeli.
Mangaki amavalvu
Njengamanje, isilinda ngalinye linama-valve amabili, amathathu, amane noma amahlanu. Uhlelo lwama-valve amaningi luhlinzeka ngezinga eliphezulu lokugcwalisa isilinda ngengxube, 
kwandisa ukupholisa kwepulaki ye-valve, kunciphisa ukuhluka kokuvuleka kwe-valve kanye nokubambezeleka kokuvalwa kwe-valve. Ngakho-ke, kunenzuzo kakhulu enjini, futhi futhi ihlala isikhathi eside kune-valve emibili.
OHV noma OHS?
Ku-valve engaphezulu, iziqu ze-valve zingaqhutshwa yi-shaft eyodwa etholakala endlini yenjini - lena isistimu ye-OHV noma ekhanda - uhlelo lwe-OHC. Uma ama-valve eqhutshwa ama-shaft amabili ahlukene atholakala ekhanda, lokhu kubizwa ngokuthi uhlelo lwe-DOHC. Ngokuya ngomklamo, ama-valve asebenza ngokuqondile kusuka ku-shaft cams noma nge-pressure transfer levers phakathi kwekhamera nesisekelo se-valve stem. Isici esimaphakathi yi-pusher. Njengamanje, ompompi abanganakekeli abanesinxephezelo se-valve ye-hydraulic valve bayasetshenziswa. Namuhla, i-OHC noma i-DOHC ivame ukusetshenziswa ezinjini zaseYurophu naseJapane. Uhlelo lwe-OHV seluvele lusetshenziswa ezinjinini ezimbalwa, njenge-American HEMI.
Ama-torque agiyelwe ukusuka ku-crankshaft kuya ku-camshaft adluliswa ngamagiya, amaketango noma amabhande okushayela kusetshenziswa ibhande elinamazinyo. Isixazululo sokugcina asidingi ukugcoba, asikwazi ukumelana nokugqoka futhi asilayishi kakhulu ama-bearings. Okuvame ukusetshenziswa kakhulu ezimotweni zanamuhla.
