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Quote:
Originally Posted by johnneilson
I guess that explains the 25"hg vacuum on the manifold...
J
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Exactly! With the throttle closed very little air can be pushed into the intake tract, so as the piston descends on the intake stroke a partial vacuum is formed. When the throttle is opened, air flow resumes and the vacuum goes away. Since we're discussing ways to increase power at or near full throttle, we want as much air as possible to be pushed into the cylinders to gain full advantage of a high compression head.