Why a Engine's Camshaft and Crankshaft is main parts of the Engine

Engine Cams and Camshafts:

A Cam changer the rotary motion of the camshaft to the reciprocating motion of the valve lifters. The cams are formed as integral parts of the camshaft. There are two cams for each cylinder, One for intake valve and the other for exhaust valve. The surfaces of the cams are hardened for longer life. The camshaft has a series of support bearings along the length. The camshaft is made of forged alloy steel.

                The Camshaft rotates once for every revolutions of the crankshaft. Each time a cam rotates, if lifts its pushrod,opening a valve. It is not useful for the pushrod rests in hard steel bucket, called a tappet, Which in turn rests on the cam. The pushrod and tapped are free to rotted, so that were takes place evenly. The cams are continuously lubricated by oil splashing about inside the engine.

Construction of Camshaft:

1) Eccentic cam

2) Big Sprocket wheel

3) Chain

Engine Crankshaft:

The crankshaft coverts the reciprocating motion of the piston into rotary motion, and transmits the torque to the flywheel. Its made of forged steel. Holes are drilled in the crankshaft from the main bearing journals to the crankpin s for the lubricating oil to pass through. The parts of crankshaft supported by and rotating in the main bearing are called journals.

    Crankshafts can be made in a single piece or assembled from several pieces. One-piece crankshafts are most common, but some smaller and larger engines use assembled crankshafts. Crankshafts can be forget from a steel bar usually through roll forging. Today more and more manufactures tend to favour the use of forged crankshafts due to their lighter weight, more compact dimensions and better inherent damping. Some engines also use cast iron crankshafts for low output versions while the more expensive high output version use forged steel. Crankshafts can also be machined out of a billet, often using a bar of high quality vacuum re-melted steel. The fatigue strength of crankshafts is usually increased by using a radius at the ends of each main and crankpin bearing. The radius itself reduces the stress in these critical areas. Some expensive, high performance crankshafts also use heavy-metal counterweights to make the crankshaft more compact.

Construction of Crankshaft:

1) Crank Webs

2) Crank Pin

3) Counterweight

4) Main Bearing journal

5) Fly Wheel Mounting Flange

6) Vibration dumper Mounting

Crankshaft metals:

1) High Carbon steel

2) Nickel Vandium Chrome

3) Silicon

4) Forget Cast