Here is my concept of a slide throttle

that I am building for my Kis Cruiser. This for a turbo down stream
from the compressor but I have since decided to make it larger to mitigate
the air friction losses in the long air pipe to the intercooler.

Paul Lamar

The slide valve throttles on Cosworth engines will hang up if just a dash of crud gets into the little rollers under the slide. Keep it loose and sealed from dirt.

I note that many people are leaving much power on the table. The ends of the runners where they enter the plenum should have the look of a trumpet bell. The radius should be at least two diameters of the pipe being supplied. A sharp corner at the inlet will flow about half what a well radiused tube will flow. Get on a flow bench and try it. If the tube prodrudes through the wall of the plenum it should have a fully radiused
bell shape as seen on the "Twinn Induction" web site.

A fragment of pop rivet stem, a tiny piece of a stone, a chunk of featherfill or a safety wire clipping can destroy a rotary before you can say "what?". I would run an air filter with as much surface area as I could install. I run a 14" X 5" K&N element. Too big for an airplane but not too big from the power standpoint. You can't loose power by adding filter area. If all of the runner ends are radiused the throttle body will limit engine power and should be very large indeed. If the runners are not radiused, or poorly radiused then that will limit engine power and the size of the throttle body doesn't matter at all.
Lynn E. Hanover

Good post Lynn. I totally agree with all of it.

Paul Lamar
 
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