Why is the 2" hole bored parallel to the housing
instead of perpendicular to where it is penetrating
the housing for a smaller overall hole?

The air is actually flowing upwards as it enters the housing.
A perpendicular opening would force the air to make more of
a right  angle. That is one reason. The other reason is it easier to set
it up on a mill table :)

A third reason is that is the way Mazda did it on the Le Mans engine.
See the attached drawing.

It is probably not that critical because some p-ports with
perpendicular holes also seem to generate about the same amount of power.

Paul Lamar

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