Momwe mungasamalire?
Njira yogawa gasi ndiyomwe imayang'anira kusakanikirana kwamafuta a mpweya m'masilinda ndikuchotsa zinthu zoyaka kuchokera kwa iwo.
Mkhalidwe wa ntchito ya injini ndikuwonetsetsa kuyenda kwa mafuta osakanikirana ndi mpweya m'masilinda ndikuchotsa zinthu zoyaka kuchokera kwa iwo. Ntchito zofunikazi zimachitidwa ndi njira yogawa.
Pa silinda iliyonse ya injini pali zigawo zomwe zimakhala ndi mavavu osachepera awiri (zolowera ndi utsi), nthawi zambiri atatu, anayi kapena asanu, ndi ma actuators awo. Amalola kuti ma valve atsegule pamene pisitoni ili pamalo abwino mu silinda. Mapangidwe a injini ndi liwiro lake zimatsimikizira mtundu wa makina omwe amagwiritsidwa ntchito. Chimodzi mwazofunikira ndi 
kufunikira kochepetsa chikoka cha inertia ya magawo osuntha pa kulondola kwa kutsegula kwa valve.
Mitundu Yamachitidwe a Nthawi
Mtundu woyamba wa makinawo unali njira yogawa gasi yotsika kwambiri. Idasinthidwa ndi yankho lamakono - njira yowerengera nthawi ya valavu, momwe ma valve onse ali pamutu wa silinda. Awa ndi ma valve olendewera pansi. Ubwino wa yankho ili ndi ufulu wokhala ndi ma valve okhala ndi ma diameter akulu mokwanira. The kuipa ndi chiwerengero chachikulu cha zigawo zikuluzikulu ndi kufunika kuonetsetsa mokwanira kukhazikika kwa zinthu wapakatikati kufala mphamvu. Njira yamtunduwu imagwiritsidwa ntchito kwambiri pamainjini amagalimoto onyamula anthu.
Mavavu angati
Pakadali pano, silinda iliyonse ili ndi mavavu awiri, atatu, anayi kapena asanu. Dongosolo la ma valve ambiri limapereka kuchuluka kwakukulu kodzaza silinda ndi chosakaniza, 
kumawonjezera kuziziritsa kwa pulagi ya ma valve, kumachepetsa kusintha kwa ma valve ndi kuchedwa kutseka kwa valve. Choncho, ndi opindulitsa kwa injini, komanso cholimba kuposa awiri vavu.
OHV kapena OHS?
Mu valavu yapamwamba, ma valve amatha kuyendetsedwa ndi shaft imodzi yomwe ili mu nyumba ya injini - iyi ndi dongosolo la OHV kapena pamutu - dongosolo la OHC. Ngati ma valve amayendetsedwa ndi ma shaft awiri osiyana omwe ali pamutu, izi zimatchedwa dongosolo la DOHC. Kutengera kapangidwe kake, ma valvewa amayendetsedwa mwachindunji kuchokera ku makamera a shaft kapena kudzera pazitsulo zopatsirana pakati pa cam ndi pansi pa tsinde la valve. Chinthu chapakati ndi chopukusa. Pakali pano, matepi opanda kukonza okhala ndi hydraulic valve clearance compensation amagwiritsidwa ntchito. Masiku ano, OHC kapena DOHC amagwiritsidwa ntchito kwambiri mu injini za ku Ulaya ndi ku Japan. Dongosolo la OHV likugwiritsidwa ntchito kale m'mainjini angapo, monga American HEMI.
Ma torque okhazikika kuchokera ku crankshaft kupita ku camshaft amatumizidwa kudzera mu magiya, maunyolo kapena ma drive amalamba pogwiritsa ntchito lamba wokhala ndi mano. Yotsirizira njira sikutanthauza mafuta, ndi kuvala kugonjetsedwa ndi si odzaza mayendedwe. Nthawi zambiri amagwiritsidwa ntchito m'magalimoto amakono.
