Quote:
Originally Posted by flatjack9
No myth involved. Ported spark was developed to reduce exhaust emissions. I worked on engine development in the auto industry in the 60's and 70's. Ported spark was a way to reduce hydrocarbons before better systems were developed. Back then, engines didn't run worth a damn because of this and other attempts to reduce emissions.
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So... what about the Fords '57 and up that used ported vacuum? That wasn't done to reduce emissions... and all the other 50s' and 60's engines GM and Chrysler that used ported vacuum? In that era the only emission controls used was a PCV valve, if that.