>
     > This is something done on carburetor
     > slides. Look at a old round motorcycle carb slide. Note the angled
     > cutaway on the upwind side? Wonder what that is for? This is a
     > jetting
     > transition control device. The cutaway works between 1/8 and 1/3
     > throttle. IT is a VERY effective jetting tool. Less angle (flatter
     > bottom) is richer, and higher is leaner. A small taper in the face
     > of
     > the slide throttle near the opening point at idle will improve
     > airflow.
     > You wouldn't need more than half the slide width. since the ramp is
     > small the disruption of the airflow would be much less than the tear
     > drop opening at WOT. FWIW
     > Bill Jepson
     >


    Thanks for the info, Bill.
    I am not sure what you mean, but it sure sounds good. :) Do you have a
    picture? I am trying to finalize the design and get it to the NC shop
    to produce a prototype.

    Doc Custer
    Retired software engineer and sometime Audiologist
    Building RV9-A. Fuselage

Doc,
 The attached JPEG shows what I'm talking about. The size could vary
considerably and still have good effect when using FI, as you can map
the low throttle openings. this should improve the airflow at very
small throttle openings. The ramp could go farther in as well though I
wouldn't go any closer than 1/8" to the back wall. The cut I modeled was
much wider than it needs to be (easier to see in the picture) It could
be less than 1/2 inch wide.
Hope this helps.
Bill Jepson

Thanks for the jpg Bill. It helps a lot.

I will incorporate the angled cutaway into the design. Thanks for the
suggestion.

Doc Custer
Retired software engineer and sometime Audiologist
Building RV9-A. Fuselage





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