Quote:
Originally Posted by patrickt
Vacuum secondaries have nothing to do with manifold vacuum. They run off of venturi vacuum, which is related to the velocity of the air/fuel mixture down through the carb. A big cam with low manifold vacuum will do just fine with a vacuum secondary carb.
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True Dat. Vacuum secondaries actually work OPPOSITE from manifold vacuum.... The secondaries open when manifold vacuum is low, and they close at idle and cruise conditions, when engine vacuum is high....
EDIT: Whoops- Posted this before I read DanEC and DCDoug's followup posts on the topic... Dead horse. I'll put my stick down, now.
