Outline how automotive engines use compressed fuel blends and sparks to generate electricity. Illustration with cylinder, block and crankcase.
The parts of an overhead-camshaft engine
The engine is at the heart of your car. It is a complex machine that converts the heat of the combustion gases into the force that turns the wheels.
The reaction chain that achieves this goal is initiated by a spark that ignites a mixture of gasoline vapor and compressed air in a cylinder that is instantly sealed and rapidly burns. This is why this machine is called an internal combustion engine. As the mixture burns it expands, providing power to drive the car.
In order to withstand the heavy workload, the engine must be a solid structure. It consists of two basic parts: the lower, heavier part is the cylinder block, the outer casing of the engine's main moving parts; the detachable top cover is the cylinder head.
The cylinder head contains valve-controlled passages through which the air and fuel mixture enters the cylinders, and others through which the gases produced by their combustion are expelled.
The block houses a crankshaft that converts the reciprocating motion of the piston into a rotational motion at the crankshaft. Typically, the block also houses a camshaft that operates a mechanism that opens and closes the valve in the cylinder head. Sometimes the camshaft is located on the head or mounted above it.