The central part of the top of a piston, often raised in some engines.
The piston crown refers to the top of the piston. A piston can generally be divided into two sections (though the piston is a single piece). The lower part of the piston is called the skirt. The upper part, including the top of the piston that faces the valves and must handle the combustion of the fuel-air mixture, is called the crown. The piston crown must have the mechanical strength to withstand the forces of combistion, and must be made of materials that will withstand the heat of combistion. All this must come in a package that has limited thermal expansion so that the tolerances within the engine are tighter and performance is maximized.
Crown
Piston crown is the top, skirt is the side below the ring lands (ring grooves). The as you say, the skirt often has cut aways to clear the counterwieghts on the crankshaft.
A larger piston skirt to cylinder wall contact raises piston cooling. With turbo motors, they have piston oilers, they spray oil on the underside of the pistons, cooling the piston /crown.
Hottest part is the piston crown....
cracked oil ring on piston
Total effective piston area is the combined area of all the pistons in an engine that are responsible for producing power during the combustion process. It is calculated by adding up the cross-sectional area of each piston that is exposed to the combustion chamber. This measurement is important for determining the engine's displacement and power output.
It compresses the air in a engine or compressor.
It compresses the air in a engine or compressor.
it connects the piston to the crankshaft
The purpose of a piston ring expander is to make it easier remove and install piston rings. Because of the low torque they use, they help to prevent damage to the piston rings.