No ka ʻenekini nui moana, ʻo ke apo piston a me ka liner cylinder he mea koʻikoʻi ka hoʻopili ʻana, a ʻo ka holo maikaʻi ʻana a me ka hana ma waena o lākou he mea nui loa ia no ka ʻenekini nui. No nā apo piston-coated alumini kahiko, ʻaʻohe pilikia i ka wā o ka hoʻohana ʻana i ka aila sulfur kiʻekiʻe. Ma hope o nā mea a pau, kōkua ka sulfur i loko o ka aila sulfur kiʻekiʻe e lubricate ma waena o ke apo piston a me ka liner cylinder. Ma hope o ka hoʻohana ʻana i ka aila sulfur haʻahaʻa, ʻaʻole maikaʻi ka kiʻi ʻaila ma ka cylinder liner e like me ka wā ma mua, ʻoiai ʻaʻole hiki i ka hoʻohana ʻana i ka aila lubricating kiʻekiʻe kiʻekiʻe ke hoʻopau i kēia hopena. E alakaʻi ana kēia i ka hoʻohana wikiwiki ʻana o ke apo piston i uhi ʻia i ka aluminika, e hoʻopilikia i ka lua friction, e hoʻonui i ka ʻaʻahu ma ka cylinder liner, a e pōkole ke ola lawelawe. Inā ʻaʻole i hoʻonui ʻia ka waiwai kumu o ka aila lubricating cylinder i kēia kaʻina hana, e hoʻonui ʻia ka lole. I kēia hihia, ʻo ka hoʻohana ʻana i nā apo piston cermet e hoʻomaikaʻi i ke kūpaʻa ʻana o ke apo piston, e hōʻemi i ka coefficient friction, e hoʻemi nui i ka hopena i ka hana ʻana o ka hui friction, a hoʻolōʻihi i ke ola lawelawe o ke apo piston a me ka cylinder liner.