Posted by B-maniac on December 30, 2012 at 17:16:48 from (97.85.57.238):
In Reply to: Vacuum advance posted by David G on December 30, 2012 at 16:33:01:
Vacuum advance was actually vacuum retard. High vacuum like you would have at idle or whenever throttle was closed actually held the point plate in a neutral or non-advanced state and instantly when you opened throttle and vacuum dropped then it gave advance for acceleration and once rpm was up then centrifugal weights swung out and give it more advance based on rpm instead of vacuum. As a rule , acceleration requires advance and a steady speed engine not so much. Since you aren't usually accelerating and stopping all the time with a tractor like you are a car , you don't need it instantly and you don't need near as much.
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