Transcription of UNIT 4 IGNITION SYSTEMS Ignition Systems
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UNIT 4 IGNITION SYSTEMS Ignition Systems
51 IGNITION SYSTEMS UNIT 4 IGNITION SYSTEMS Structure Introduction Objectives IGNITION System Types Comparison between Battery and Magneto IGNITION System Drawbacks (Disadvantages) of Conventional IGNITION SYSTEMS Advantages of Electronic IGNITION System Types of Electronic IGNITION System Firing Order Importance of IGNITION Timing and IGNITION Advance Summary Key Words Answers to SAQs INTRODUCTION We know that in case of Internal Combustion (IC) engines, combustion of air and fuel takes place inside the engine cylinder and the products of combustion expand to produce reciprocating motion of the piston. This reciprocating motion of the piston is in turn converted into rotary motion of the crank shaft through connecting rod and crank.
Note that the Figure 4.1 shows the ignition system for 4-cylinder petrol engine, here there are 4-spark plugs and contact breaker cam has 4-corners. (If it is for 6-cylinder engine it will have 6-spark plugs and contact breaker cam will be a perfect hexagon). The ignition system is divided into 2-circuits :
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