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Ignition Timing


Ignition Timing refers to the process of setting the time of a spark that will occur during the power stroke. Some service procedures require removing the distributor from the engine. Do not turn the crankshaft while the distributor is out. This simplifies reinstalling the distributor. If the crankshaft turns, the proper relationship or timing must be re-established between the distributor rotor and piston position, Most of the engine's time is on number 1 points. 

The engine requires two types of ignition timing. One is the basic or initial timing for starting and idling. This timing is determined by the relationship between piston position and the opening of the primary circuit, The other timing or spark advance, advances and retards the spark from the basic timing setting, primarily as engine speed and load change, On some distributors, it is mechanically controlled by centrifugal. and vacuum advance mechanisms, Other ignition systems have electronic spark advance. It is used on many electronic distributors and in all distributorless ignition systems.