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Vacuum Advance Control

Vacuum advance is a part of the distributor system. It is located on the side of the distributor and its job is to vary the when the spark occurs. It accomplishes this through the vacuum on the intake manifold. When the engine is operating at part throttle, the vacuum advance provides better use of the fuel. When the throttle is only part open, there is not as much air available to the air/fuel mixture. That means that the fuel will take longer to burn once ignited. In turn, the piston will not get the full power out of the combustion as it could. The vacuum advance control gets the whole process to happen a bit sooner so that the full use of the fuel will be affected. This happens because the vacuum is connected to a diaphragm that is connected to the carburetor. The vacuum advance rotates the diaphragm and that prompts it to act sooner than it normally would.

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