Joseph M Berki wrote:

Paul,
         What orientation do the slides have to be in with relation to the
housings/ports?  This P  port looks very interesting.  I will commit
resources when I am closer to finishing the airframe.

Joe Berki
Limo EZ

At 02:47 PM 1/3/2005 -0800, you (ACRE) wrote:

More expensive than a butterfly but considering what a turbo
would cost in terms of weight and expense P-ports are bargains.

Works much better than a butterfly. Uses four cheap 1/4 inch OD
ball bearing from Stock Drive Products. Ball bearings
are necessary as when the throttle is suddenly closed suction
in the intake runner can cause a slide throttle to stick.

The pocket does not have to be milled out of a billet.
could be laser cut from sheet stock in three pieces. Front cover
back cover and spacer.

Since there is one slide throttle  per intake runner cost can be
cut by a quantity order of all the pieces.

Paul Lamar

Joseph M Berki wrote:

Paul,
         What orientation do the slides have to be in with relation to the
housings/ports?  This P  port looks very interesting.  I will commit
resources when I am closer to finishing the airframe.

Joe Berki
Limo EZ

Does not matter as long as the side of the slide with the wheels in contact are towards
the engine. The big problem is the vacuum in the engine on over run places large forces
on the slide that can cause them to stick if not designed right. 2 inch port, 3.14 square
inches, 15 psi 50 pounds of force.

Traditional slide throttles use recirculating linear ball bearings.
The cost breakthrough came by making the slide a miniature four wheel car.

If the orientation is up like guillotines the throttle linkage is easier.

You can also make a long one that includes two ports.

Paul Lamar
 
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