pūoko porowhita
Ko te pūoko tūranga o te toki porowhita tētahi o ngā pūoko tino nui o te pūnaha whakahaere hiko o te mīhini. Ka whakaratohia e ia te wā mura (te koki whakamua o te mura) me te tohu hei whakaū i te tūranga o te toki porowhita, ā, ka whakamahia hei kite i te pokapū mate o runga o te piston, te koki hurihuri o te toki porowhita me te tere o te mīhini. He rerekē te hanganga e whakamahia ana e te pūoko tūranga o te toki porowhita i ia tauira, ā, ka taea te wehewehe ki ngā wāhanga e toru: te momo pāorooro aukume, te momo whakaahua-hiko me te momo Whare. I te nuinga o te wā ka tāutahia ki te pito o mua o te toki porowhita, te pito o mua o te toki kame, ki runga i te wira rere, ki roto rānei i te tohatoha.