LUBRICATION SYSTEM IC engine is made of many moving parts. Due to continuous movement of two metallic surfaces over each other, there is wearing moving parts, generation of heat and loss of power in the engine. Hence, lubrication of moving parts is essential to prevent all these harmful effects. IN ENGINE THE FRICTIONAL LOSSES IS ATTRIBUTED DUE TO THE FOLLOWING MECHANICAL LOSSES: DIRECT FRICTIONAL LOSSES: Power absorbed due to the relative motion of different bearing surfaces such as piston rings, main bearings, camshaft bearings etc. PUMPING LOSS: Net power spent by the piston on the gas during intake and exhaust stroke More in case of four-stroke engine compared to two-stroke engine POWER LOSS TO DRIVE COMPONENTS TO CHARGE AND SCAVENGE: In four stroke-supercharged engine, compressor used to provide high-pressure air, which is mechanically driven by the engine. This is counted as negative frictional loss. In two-stroke engine scavenging pump is used wh
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