Vacuum advance

dartfreak75 said
I understand how it works i guess I just don't understand why it's needed. When you hammer down on the throttle vacuum drops and the advance drops as well, so it's gonna drop from 50* back down to the 36* total what I don't understand is why do you need that extra advance under low load? Is it a fuel economy "full burn" thing?
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Yes it is a fuel economy thing.
At light load your engine can handle 50* which will increase the efficiency of the burn thus increasing fuel economy.
Unless you have a custom distributor I doubt you will get to 50*.
My distributor with vacuum advance was curved by FBO and it max's out at 44*