%META:TOPICINFO{author="blundar" date="1077236587" format="1.0" version="1.1"}%
%META:TOPICPARENT{name="EcuFamilies"}%
Vaccuum Advance is a purely mechanical method for varying the amount of Spark Advance based on engine load. A vac-advance distributor is connected to a source of engine vacuum. As vacuum increases, forces of suction rotate the distributor, creating more ignition advance.
The ECU cannot control timing at all with a vacuum advance distributor. |