Vacuum Secondary vs Mechanical Secondary

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#12 (permalink)

02-17-2017, 03:18 PM

patrickt

Half-Ass Member

Join Date: Jun 2005

Cobra Make, Engine: ERA #732, 428FE (447 CID), TKO600, Solid Flat Tappet Cam, Tons of Aluminum

Posts: 22,025

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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. If your engine builder, or engine tuner, doesn't understand the difference between the two then you shouldn't let him even look at your engine.

Gaz64, wolf k and moore_rb like this.

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