Paul,

I want to set up a flow bench to do comparative testing between a slide
throttle and a rotary barrel throttle I am machining now. The slide
throttle is wonderful but as Jerry mentioned years ago with an angled in
approach  wrapping the manifold closely over the top of the engine
becomes more challenging.  My design eliminates that problem as the
manifold comes in from the top.  Each throttle becomes an angled
manifold as well. Present device housing width with  50mm dia. ports is
about 72mm wide and 76mm in diameter.  Port tube are 2" NPS threaded
and screw into the throttle body.  For a sectional view imagine a
compass circle with north straight up. At the 270 degree location is the
center line port going into the engine.  At the approx. the 40 degree
center line is the inlet.  The inside rotating barrel has a passage way
through it.  I plan to test two versions of barrels. These are solid
cylinder with passageway milled out, and a hollow tube with inlet and
outlet holes cut out. Short shafts are pressed into the ends of the
barrel and extend through miniature sealed bearings to the outer
housing. The  shafts connect to the driving mechanism and/ or to its
neighboring throttle.

Instead of using a manometer I was thinking that using a MAF sensor would
be wiser as the info can be stored in computer program and I could test
the unit I want to use.  To create the flow I want to power up the
supercharger with an electric motor and get some data on hp. consumed
verses flow as well.

If you like I can do a side by side test with one of your slide throttles
and get some flow verses section open area  data.  This information is
valuable in identifying possible turbulence issues at partial throttle
openings.

I could use some info on the $61, ('02 5.4l V8) Rock Auto MAF sensor you
bought $61 Colin.
What size ID is it?


Doug in Japan

That is a good idea Doug. In effect you are reducing the radius of one of
the
two 90 degree bends. I am looking forward to the results from the flow bench
test. How are your Rhino skills coming? Can you do a 3D for us?

Paul Lamar


Is something like this what you have in mind Doug?

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Or perhaps this. If this it is going to affect the pipe resonance
and hence the power IMHO.

BTW the same organ pipe  phenomena can help the turbo compound if the
exhaust pipes are resonant IMHO. We might be pleasantly highly surprised :)

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There is a leak when the throttle is closed on this 90 degree version.
That may go away with a greater than 90 degree angle which would
be your case.

What is the angle of your p-port tube Doug?

Paul Lamar