Transcription of Internal Combustion Engines - iitg.ac.in
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Internal Combustion Engines - iitg.ac.in
1 Internal Combustion EnginesLecture-16 UjjwalKSaha, of Mechanical EngineeringIndian Institute of Technology GuwahatiPrepared underQIP-CD Cell Project2 The Combustion in a spark ignition engine is initiated by an electrical discharge across the electrodes of a spark plug, which usually occurs from 100to 300before TDC depending upon the chamber geometry and operating conditions. Introduction The ignition system provides a spark of sufficient intensity to ignite the air-fuel mixture at the predetermined position in the engine cycle under all speeds and load In a four-stroke, four cylinder engine operating at 3000 rpm, individual cylinders require a spark at every second revolution, and this necessitates the frequency of firing to be (3000/2) x 4 = 6000 sparks per minuteor 100 sparks per second.
5 Ignition System -Requirements The system must distribute this high voltage to each of the spark plugs at the exact time in every cycle, i.e., it must have in it a distributing device It should provide a good spark between the electrodes of the plugs at the correct timing
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