He rite tonu te tukanga mahi a te mīhini tīhiera ki te mīhini penehīni, ā, e whā ngā whiunga o ia huringa mahi: te whakauru, te kōpeketanga, te mahi me te whakaputanga. Heoi, nā te mea ko te wahie e whakamahia ana i roto imīhini tīhieraKi te mea he hinu tīhiera, he nui ake tōna matotoru i te penehīni, kāore e ngāwari ki te mimiti, ā, he iti iho tōna pāmahana tahunga ohorere i te penehīni, nō reira he rerekē te āhua hanganga me te momo mura o te ranunga mura i ngā miihini penehīni.
Ina nui rawa te koki whakamua o te tuku wahie, ka werohia te wahie mēnā he iti te pāmahana hau i roto i te rango, he ngoikore te āhua o te hanganga ranunga, he nui rawa te kohi hinu i mua i te tahunga, ka puta he mahi uaua o te miihini tīhiera, he koretake te tere noho, he uaua hoki te tīmata; i roto i te haora, ka puta te wahie i muri i te tahunga, ka heke te pāmahana me te pēhanga mōrahi o te tahunga, kāore i oti te tahunga, ā, ka heke te mana, ā, ka puta he paoa pango mai i te putanga hau, ā, ka wera rawa te miihini tīhiera, ka heke te mana me te penapena. Kāore te koki whakamua wahie tino pai i te pumau, ā, me whakanui ake me te huringa o te kawenga tīhiera (tuku wahie) me te tere, arā, me te piki haere o te tere. He mārama, he paku nui ake te koki whakamua tuku hinu i te koki whakamua weronga hinu. Nā te mea he ngāwari te tirotiro me te pānui i te koki whakamua tuku hinu, he nui ake te whakamahinga i roto i te wāhanga whakaputa me te tari whakamahi.
Mena he nui rawa te koki i waenganui i te rārangi pokapū me te rārangi poutū o te porowhita hono o te crankshaft, arā, he nui rawa te koki whakamua o te tuku hinu, kei tawhiti atu te piston i te TDC, i tēnei wā ka uru te wahie ki roto i te rango, ka tahuna i mua, ka whakaputa mana, kia kore ai te piston e tae ki te TDC i te hekenga, kātahi ka whakaitihia te ōwehenga kōpeketanga i roto i te rango, ka heke hoki te mana o te miihini, ka piki ake te pāmahana. Ā, he tangi patuki kei roto i te rango.
Te nuingangā miihini tīhierawhakatau i te koki whakamua werohanga pai rawa atu i raro i te āhuatanga o te tere kua whakatikatikaina me te kawenga katoa mā te whakamātautau. Ina tāutahia te papu werohanga ki rungamīhini tīhiera, ka whakatikatikaina te koki whakamua werohanga kia rite ki tēnei, ā, kāore e rerekē i te nuinga o te wā i te wā e mahi ana te miihini tīhiera. He mārama, inamīhini tīhierakei te rere i raro i ētahi atu āhuatanga, ehara tēnei koki whakaterenga werohanga i te mea tino pai. Hei whakapai ake i te ōhanga me te mahi mana o temīhini tīhierame te whānuitanga tere nui, e tumanakohia ana ko te koki whakamua werohanga o temīhini tīhieraka taea te whakarite aunoa me te huringa o te tere kia mau tonu te uara pai ake. Nō reira, ko te papu werohanga o tēneimīhini tīhiera, inā koa te mīhini tīhiera werohanga tika, he maha ngā wā ka whakauruhia ki te kaiwhakahaere aunoa angle whakamua mō te tuku wahie toremi.
Wā tuku: 21 o Ākuhata-2024