I kēia manawa, ʻelua ʻano nui o nā ʻenekini kaʻa: nā ʻenekini hao a me nā ʻenekini alumini a pau. No laila ʻo wai o kēia mau ʻenekini ʻelua ʻoi aku ka maikaʻi e hoʻohana? He aha ka ʻokoʻa ma waena o nā ʻenekini ʻelua? ʻO ka ʻoiaʻiʻo, ʻaneʻane hana ʻia nā mea ʻenehana poʻo pahu pahu i ka alumini, no ka mea, ʻoi aku ka maikaʻi o ka hoʻopau ʻana o ka wela i nā poʻo alumini. ʻO ke poʻo puʻupuʻu o ka ʻenekini hao he alumini alumini maoli nō, akā ʻo ka pahu pahu he hao.
Ke hoʻohālikelike ʻia me ka ʻenekini alumini holoʻokoʻa, ʻoi aku ka ikaika o ka pahu cylinder o ka mīkini hoʻolei hao, ʻoi aku ka maikaʻi o ka hoʻonui ʻana i ka mana o ka mīkini. No ka laʻana, ma lalo o ka hopena o ka turbocharging, hiki i ka 1.5L displacement cast-iron engine ke hiki maoli i kahi 2.0L displacement mana koi; ʻoiai ʻaʻole hiki i ka mīkini alumini āpau ke hoʻokō i kēlā koi. I kēia manawa, he liʻiliʻi wale nō nā kaʻa kiʻekiʻe e hoʻohana ana i ka mīkini alumini a pau.
Eia kekahi, hiki i nā ʻenekini alumini a pau i nā hopena kemika me ka wai i ka wā o ka hana, a ʻoi aku ka liʻiliʻi o ko lākou pale ʻana i ka corrosion ma mua o nā pahu hao, a ʻoi aku ka haʻahaʻa o ka ikaika o nā pahu alumini ma mua o nā pahu hao. No laila, ʻo nā ʻenekini turbocharged āpau he mau poloka hao. He mea kūpono ke ʻōlelo ʻia ʻo ka pahu pahu hao i loaʻa ka ikaika hoʻololi ʻaʻole i loaʻa i ka mīkini kino alumini.
ʻO ka mea like ʻole, ʻo ka pōmaikaʻi nui loa o nā ʻenekini alumini a pau ma ka neʻe like ʻana, ʻo ke kaumaha o nā ʻenekini alumini āpau ma kahi o 20kg ʻoi aku ka māmā ma mua o nā ʻenekini hao. Eia kekahi, ʻoi aku ka maikaʻi o ka hoʻoheheʻe ʻana o ka wela o ka mīkini alumini a pau ma mua o ka mīkini hao, hiki ke hoʻomaikaʻi i ka hana pono o ka mīkini a kōkua i ka hoʻonui ʻana i ke ola lawelawe o ka mīkini.
I kēia manawa, aneane pau nā piston engine i hana ʻia me ka alumini alumini. Inā he alumini a pau ka mea paia cylinder, ʻoi aku ka nui o ka coefficient o ka friction ma waena o ka alumini a me ka alumini, e hoʻopilikia i ka hana o ka mīkini. ʻO ia ke kumu e hoʻokomo mau ʻia ai nā laina hao hao i loko o ke kino cylinder o nā ʻenekini alumini a pau.
ʻO kaʻoiaʻiʻo, i ka hōʻuluʻuluʻana, loaʻa i ka'enekini alumina āpau nāʻano o ka hana maʻalahi, ke kaumaha māmā, a me ka hoʻokuʻu wela maikaʻi. Hōʻike ʻia nā mea maikaʻi o nā ʻenekini hao i ke kūpaʻa kiʻekiʻe kiʻekiʻe, ke kūpaʻa kiʻekiʻe o ka mahana, ka pale ʻana i ka corrosion, ka deformation a me ke kumu kūʻai haʻahaʻa.
