On second thought here is a much, much better solution. Where is it written
that a butterfly valve must be round? I don't know where I get these brilliant ideas.
They just occur at random. This is the easiest to build, lightest
and cheapest to build throttle body you will ever see. Major breakthrough.

I extended the four inch square extruded tube plenum four inches further
forward and used a square butterfly.  Further more the stock double hole butterfly
shaft just happens to have a four inch long slot. Perfect for our use. Major
breakthrough.

It takes about a half hour or less to make this throttle body.
The square butterfly itself is sheared out of . 049 sheet steel. What could
be simpler to make?

If you want to get fancy you can add a couple of small instrument ball bearings
to the shaft.

Paul Lamar

Paul, Are you aware of the Predator carburetor? They use a double barn door concept with two rectangular plates hinged from the side. The plates completely
open the orifice. Much more complex than the single shaft though.
Bill Jepson

News to me. Sounds good though.

Paul Lamar
 
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