[Corley]

"I have experience with combination distributors,and the ones used in the 70's-80's were mapped for a cleaner,hotter burn."


When Detroit went nuts with emmissions in the 70s and 80s. They went with ported vacuum for the distributor. Basically, ported vacuum does as you say, creates a hotter burn, by retarding the spark under various conditions. They also put various controls to further restrict when vacuum was applied to the advance chamber. A big part of their motivation was to get things hot enough so that the cat converter would light off. What a disaster that turned out to be. Greater retard meant higher temps, crappy mileage, and tuning issues, often making more pollution than without all that crap. The distributors sometimes even had a vacuum chamber to retard timing even further. A lot of decent engines went to the dumper because of that fiasco.


I assure you that we are not implementing anything like that with this dizzy. For all practical purposes, it is just like something from the 30s-60s, and very basic in design. You will not see any additional heat generated from this whatever.