Carburetor.
Actually, a carburetor is not usually considered part of an engine, it's part of the fuel system. If you buy an engine, you don't get a carburetor with it. Also, most cars don't have carburetors any more.
A five letter word for a race car engine is a motor.
carburetor
carburetor.
The radiator cools the engine.
engine?
crankshaft
older engines have carburators
The car engine needed to be rebuilt.
Car
oops. what sort of tool and what part of engine.
The engine bay is the part of the car where the engine is.
the engine