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Username Post: Vacuum Advance- how is it supposed to work?
Trucked_up
Valued Contributor
Posts 4948
04-06-10 03:06 AM - Post#1893671    

  • Quote:
After 30-40 years of controlling vacuum advance with full manifold vacuum, along came emissions requirements, years before catalytic converter technology had been developed, and all manner of crude band-aid systems were developed to try and reduce hydrocarbons and oxides of nitrogen in the exhaust stream. One of these band-aids was "ported spark",


Who ever wrote that never worked on older vehicles.many,probably almost all used ported vacuum,cars and trucks.
But the full vacuum does work nice on a hi performance street engine.


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