The term 'automobile engine part' can be summarized as a camshaft, which is an eight-letter word. A camshaft is a cylindrical rod that is used to operate the intake and exhaust valves of an internal combustion engine. It is driven by the crankshaft and helps to control the timing of the engine's valves. The camshaft is an essential component of an automobile engine, as it helps to ensure that the engine runs smoothly and efficiently.