He kūpono ia no ka hoʻopili ʻana i nā ʻāpana lahilahi o ka hoʻoheheʻe ʻana i ka hao a me nā ʻili mīkini, e like me nā poʻo cylinder, nā poloka ʻenekini hao hina hina nui, nā pahu pahu, a me nā mea hana mīkini a hiki koke.
He kūpono ia no ka hoʻopili ʻana i ka hao hina ikaika a me ka hao nodular, e like me ka cylinder, block engine, gear box, etc.