State the functions and materials of following engine components: (i) Piston (ii) Connecting rod (iii)Crank shaft (iv)Exhaust manifold

State the functions and materials of following engine components: (i) Piston (ii) Connecting rod (iii)Crank shaft (iv)Exhaust manifold
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1 Answer

Answer :

Engine components
Material
Functions
Piston
Cat aluminum alloy
To transmit the force of explosion to the crankshaft.
To form seal so that the high pressure gases in combustion chamber do not escape into crankcase.
To serve as guide and bearing for small end of connecting rod. 
Connecting rod
Steel alloy, aluminum alloy and titanium
It converts the reciprocating motion of the piston into rotary motion of crankshaft.
It connects piston to the crankshaft.
Crank shaft
Cast iron or forged steel
It converts the reciprocating motion of piston to rotating motion.
It transmits power to flywheel.
It receives power from flywheel. 
Exhaust manifold
simple cast iron or stainless steel
The function of an exhaust manifold is to expel the exhaust gases from the combustion chamber of each cylinder out to the atmosphere through the exhaust pipe after combustion stroke is completed.
To keep back pressure minimum.
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