Piston is reciprocating part in IC Engine.It's function is to transfer the pressure energy which is generated due to combustion to coneecting rod.Depression is provide in piston head if engine has valves.At the end of compression stroke both inlet as well as exhaust valve is closed but during exhaust stroke exhaust valve remains open untill the piston reaches the top dead cenre.During suction stroke inlet valve opens after top dead center.In IC engine to achieve a good efficiency high compression ratio is required.To maintain high compression ratio, very less space is left on the top of the piston when it is on the top dead centre.
so when valve is open they can hit with the piston.To avoid this we provide depression on piston.By doing so clearnce is minimized and piston valve interference is also eliminated. Manufacturer has to consider this during design and manufacturing of piston.
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