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DIFFERENCE BETWEEN S.I AND C.I ENGINES

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. ...

TORQUE CONVERTER

TORQUE CONVERTER

The torque converter gives more torque at its output shaft. This torque multiplication can be upto 3 times. 

Construction: A torque converter consists mainly of three components: 
(1) Driving member or impeller 
(2) Driven member or turbine
(3) Fixed member or stator

•The impeller is onnected with the input shaft i.e. crank shaft. 
•The turbine is connected with the utput shaft ie. impeller shaft. 
•The stator is a fixed member and is mounted on the rame. 
•The complete unit is sealed and filled with mineral oil which works as power ransfering medin.

Working: When the input shaft starts to rotate, the oil in the impeller is thrown outside due to centrifugal force. This oil having kinetic energy enters the turbine blades and force them to rotate. When a certain level of pressure on turbine blades is reached, it starts to rotate and vehicle starts moving. The oil from turbine blades travel back to impeller and rotate the impeller in forward direction with the help of stator. The oil from impeller again enter the turbine blade and this process goes on repeatedly. Because of this, the torque of the turbine is increased. Hence we get higher torque at output shaft.

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