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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Yup, it cleans up part throttle combustion to help keep the plugs from fouling, helps fuel economy a good bit. That's why I always recommend running the advance if it's a street car. The vacuum signal on mine is 6 at idle and only 14 at cruise, but I still run the advance can.