Ọrụ nke obere ihe nchebe nke dị n'ihu ogwe ụgbọ ala: 1, iji gbochie obere ihe na-agbaba n'ime ụlọ engine mgbe ị na-anya ụgbọ ala, na-akpata mmebi nke engine, ma ọ bụ imetụ mmanụ mmanụ mmanụ aka mgbe ọ na-adọta ala, na-emetụta ọrụ nkịtị nke engine ahụ, mgbe ị na-edebe ụlọ engine dị ọcha; 2, mgbe ị na-agbagharị, ọ nwere ike igbochi mmiri ịgbasa n'ime ụlọ engine, ma gbochie akụkụ eletriki mmiri mmiri na-ebute nsogbu.
