Originally Posted by Shmoo
The #1 cylinder usually gets robbed of air since the other three cylinders are positioned before it and the stock plenum's shape doesn't help for the air flow. The skunk 2 and other aftermarket manifolds have solved this by the shape of the plenum to ensure that all cylinders get all the air they need by using the physics of the wave you are describing.
:werd:
Also some OEM honda manifolds are biased to the #3 cylinder for some reason...possibly it's the fluid dynamics of the air rushing into the plenum at high velocity. I wish I could see the airflow inside one somehow at WOT and high RPM.
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