Assuming you are refereeing to a physical engine not one of the software variety. Its to propel motor vehicles.
Next time Phrase your question better and then you will get a better anwser.
To provide energy for a certain, specialized function. In the case of a car engine, to convert chemical energy, in the form of Fuel, such as Gasoline or Diesel, in to Mechanical energy, the force of the moving parts.
The cool air intake is mainly to keep the engine oxygenated and allows for a higher performance and efficiency of the engine. This also keeps the engine from over heating. Its mostly performance based.
If the P-lead is grounded, the magneto doesn't generate spark. Basically it turns the engine on and off.
Lead is no longer added to petrol because it added to both air pollution and general health risks. It used to be added for help in maintaining the general "health" of an engine's valves as well as reducing engine knocking.
They do not mix, the oil and water circulate in separate closed systems within the engine block. The water is pumped through the radiator, then through special channels in the engine in order to cool it by means of heat transfer. The the oil is pumped from the oil pan to the head, pistons, crank, and other essential engine components. If the water and oil in your engine do happen to mix it's typically a problem due to a blown head gasket, or cracked or warped cylinder head. Failure to repair this condition can result in engine failure.
Depending on the type of engine, piston, turbine, external, rotary, among others there are numerous components to an engine without which the engine will not function. For example a typical piston cylinder engine(from any car) will not work without any of the following components-piston, carburetor/fuel injection, con-rod, crankshaft, inlet/exhaust valves, camshaft, camchain/timing belt. An engine is a complex device that requires many finely balanced components to work in harmony. But to pick the most important, it would probably be the crankshaft which is present in any type of engine in some shape or form.
Main propulsion is the function of the marine main engine.
The function of the bearing in a combustion engine is to offer lubrication.
Main propulsion is the function of the marine main engine.
to cool engine
The major function is to provide a motive force. It may be a static engine or a mobile one.
controlled the speed engine
controlled the speed engine
The function of springs in a combustion engine is to lift the weight of the valve and to keep valves closed.
its function is to force air into the engine to increase hp
engine block, it's function is to carry the engine or where the cylinder head set, piston, it;s function is to compressed the air and fuel.
the engine
function of jet in carburettor