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jyrkilaune jyrkilaune is offline
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Join Date: Jul 2013
Posts: 9
Originally Posted by unclebilly View Post
Dont forget with forced induction, the symmetry doesn't matter as much. If there is 10psi at each port (and there will be at .6 bars of boost) each cylinder should get the same amount of air pushed in. This isn't like a NA engine where the auction of the downstroke of the pistons has to pull in the air. In this case the manifold must be far better balanced.
Thanks for the comments. With all due respect, I don't quite agree with the quote above. If the manifold is the bottle neck and the flow varies between cylinders, then the amount of air will vary too.

I wonder if anyone has measured this in a reliable way. There are plenty of high hp cars with pancake manifold. If you would know the flow of each intake path, you could implement a compensation map, decrease the AFR safety margin and make more power without hurting the engine.

Anyone with measured data? How about common knowledge: which cylinders run lean, which cylinders run rich?

Old 12-27-2014, 11:18 PM
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