Ihe nzacha mmanụ bụ nzacha emebere iji wepụ ihe ndị na-emerụ emerụ na mmanụ injin, mmanụ nnyefe, mmanụ mmanye, ma ọ bụ mmanụ hydraulic. Naanị mmanụ dị ọcha nwere ike hụ na arụmọrụ engine na-anọgide na-agbanwe agbanwe. Dị ka ihe nzacha mmanụ, ihe nzacha mmanụ nwere ike ịbawanye arụmọrụ engine ma n'otu oge ahụ belata oriri mmanụ.