Contact breaker system
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Contact breaker ignition systems provide a simple means of establishing and interrupting the current flowing in the primary ignition circuit.
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Primary & secondary windings
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The secondary winding, with about 100 times as many turns as the primary winding, can have an induced voltage about 100 times greater than the primary induced voltage. However, the actual firing voltage depends on many factors, including whether the engine is idling, or operating under load.
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The ballast resistor coil
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A ballast resistor coil is designed to operate at approximately 7.5 volts and still provide the step-up transformer action needed, for secondary circuit operation.
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Dwell angle
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The dwell angle in contact breaker systems is designed to allow sufficient time for current to flow through the primary winding and establish the necessary magnetic field.
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Spark timing
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The ignition timing point can be advanced by a centrifugal type mechanism according to engine speed and by a vacuum operated mechanism, according to load.
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