Lab_18__Ignition_Systems_

Lab_18__Ignition_Systems_ - BSE 2484 Lab # 18 (Ignition...

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BSE 2484 Lab # 18 (Ignition Systems) STATION # 1 (Ignition Coils) The purpose of an ignition coil is to convert low voltage from the primary circuit to high voltage to produce the spark on the secondary circuit. Ignition coils are composed of an iron core and two windings, a primary winding (low voltage) and a secondary winding (high voltage.) The primary winding made up of perhaps 100 loops of relatively heavy wire which has a fairly low resistance. The secondary winding is composed of perhaps 1,000 loops of fine wire which has a relatively high resistance. The principle of induction is applied in the ignition coil; as current flows on the primary winding it generates a magnetic field which in turn induces a voltage on the secondary winding. Because the secondary has many more loops than the primary winding a much higher voltage is produced on the secondary winding. Use the ohmmeter to test the resistance of the primary and secondary windings of the coil at this station. What is the resistance of the primary winding in ohms? Blank # 1 What is the resistance of the secondary winding in ohms? Blank # 2
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BSE 2484 Lab # 18 (Ignition Systems) STATION # 2 (Distributor Assembly) Distributors control the primary circuit on the ignition coil and distribute the spark to each cylinder. The battery, primary winding and breaker points make up the primary circuit. The burn time of the air fuel mixture is about 0.003 seconds. The mixture must be combusted before the piston travels 10-20° past TDC. There for the spark must come earlier in the cycle as the engine RPM increases. A centrifugal/mechanical advance consisting of fly weights is used to advance the timing of the spark(by advancing the breaker cam) to obtain the full power of combustion. Spark advance is also required to improve economy during part throttle operation. Part throttle advance is obtained using a vacuum advance mechanism which uses a diaphragm to advance the breaker plate. Unlike the centrifugal advance vacuum advance is not dependent on engine RPM. Identify the parts of this distributor and answer the following questions.
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This note was uploaded on 03/31/2008 for the course BSE 2484 taught by Professor Dhvaughan during the Spring '08 term at Virginia Tech.

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Lab_18__Ignition_Systems_ - BSE 2484 Lab # 18 (Ignition...

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