A car piston is a moving metal cylinder inside the engine that converts the energy from burning fuel into mechanical power to turn the wheels.Main FunctionsConvert energy: It changes the explosive force of burning gas into usable mechanical movement.Transfer power: It pushes down on a connecting rod to spin the engine's crankshaft.Compress fuel: It moves upward to squeeze the air and fuel mixture before it ignites.Help airflow: It moves up and down to draw in fresh air and push out exhaust gases.Seal the chamber: Working with piston rings, it stops gas and oil from leaking where they shouldn't.Move heat away: It absorbs intense heat from combustion and passes it safely to the engine coolant or block