Paul, and gang

I got my MAF sensor and Rotrex blower system working and I am making a
simple wooden flow bench now.  My engine is boosted so the test bench is
set up to blow not suck.  I want to flow test the 12 degrees angled down
P port housing and the 53 mm ID butterfly valve I made to confirm their
flow. Ditto the new intercooler and everything in combination with
ambient air getting hotter. I used a 50 mm ID P-port insert for several
reasons.

1.    To increase flow to max.  Hp.

2.    Using that ID I was able to bring the inner hole to exactly match the
upper and lower edges of Paul's straight-in approach.

3.    A desire to use a removable P- port with inner and outer O-ring
grooves on the insert itself. This has some obvious advantages.

4.    I never considered the high exit angle a problem as molded composites
solves all sorts of the limitations of using store bought aluminum
elbows.

5. Last but not least, my primary goal was to emulate Steve's work with
an up close throttle.  The half inch thick butterfly and the machined
off housing gets pretty darn close.  I originally wanted individual
slide throttles but there are too many items that interfere like my
injectors in one direction and the side housings in the other.

Now what Paul says about an angled down PP approach being less
aerodynamically sounds logical.  The question is how much?  To test the
difference I will have to make up a housing with a straight-in P-port of
the same ID.  If someone wants to lend me one for a month I will be
happy to do the comparison test.  Frankly being flow limited is not a
big concern of mine.  I can alway slip in a 51 ID p-port.

My bigger concern is how to verify flow. Free flowing the port it to
atmosphere will not conclusively prove anything other than bigger is
better and that a shaped port flows better than a sharp edge port.
Common knowledge but good for confirmation of port flow characteristics.

To make the comparison tests however we would have to be able to test how
the airflow is affected when striking the face of the rotor.  Paul Yaw
does this but I don't know the details of his set-up. I believe we
would have to seal the side of the housing with say clear acrylic
sheets, then install a seal able rotor, stationary gear and shaft. It
would also need an external hand crank to turn the rotor through the
range of port opening, overlap finishing and port closing.

Question where to let the air exit?   Linear slots on each side at ten
o$B!G(Bclock?

Doug in Japan