Criteria S.I. Engine (Petrol or Spark Ignition Engine) C.I. Engine (Diesel or Compression Ignition Engine) Working Cycle Works on Otto Cycle or Constant Volume Cycle. Works on Diesel Cycle. Mixture During Suction Stroke Takes a mixture of air and petrol during the suction stroke. Takes only air during the suction stroke. Fuel Used Uses petrol as fuel. Uses diesel as fuel. Compression Ratio Has a compression ratio that varies from 6 to 10. Has a compression ratio that varies from 16 to 20. Engine Weight and Cost S.I. engines are lighter and cheaper. C.I. engines are heavier and costlier. Initial Cost Initial cost is lower compared to C.I. engines. Initial cost is high due to high compression ratio. Starting Starting is easy. Starting is difficult, especially in cold conditions. ...
CLUTCH - It is a mechanism which transfer rotary motion of one shaft to another shaft. PARTS OF CLUTCH - • The driving unit • The driven unit • The operating unit FUNCTION OF CLUTCH • To engage the engine power to Gear box • To Disengage the engine power to Gear box. • To help in shifting the Gear in Gear box. • To provide a smooth and gradual operates to take up load without jerk. TYPES OF CLUTCH - SINGLE PLATE CLUTCH: - It is a type of disc clutch. It uses a single disc called clutch plate. CONSTRUCTION - •It consists of 3 main parts, Flywheel, clutch plate and pressure plate assembly. The flywheel is attached to engine shaft and actas driving member. • The clutch plate is a steel disc. It is connected to splined hub through springs. The spleen shaft ,which is also a gear box shaft , slides in the hub. There is friction lining on both sides of the steel disc. The lining are either riveted or blinded on the steel disc. • The pressure plate assembly consists o...