George,

Nice work.
I just finished a design for slide throttles myself and it appears we think
alike with very similar throttle plate design.  I credit you with the
inspiration to use one unit per port.  I don't understand the mass of metal
below the port though.  I  assume those four machine screws on the throttle
plate are for holding the rollers in place?

Doug in Japan

Doug,
Thanks for the comments - it's the way to go alright, that is making it
yourself if you can't buy what you want.
That mass of metal that you speak of is there to accommodate the depth of
the needle ( rear tapered type). The needle itself is simple to make. Some
of that metal will be for machining (to lighten) and some will accommodate
the an adjustable inlet valve.
I will run a low pressure pump with an adjustable pressure valve with 1.5 to
2 PSI.
My needle will also be adjustable up and down for leaning and enrichening
(from the cockpit).
BTW those machine screws do hold the 10mm rollers in place - I have about
.03 to .06 mm rear slide tolerance and about .02mm bearing to side wall
clearance. The screws have a tapered head to precisely hold the bearings
centre. The threads are not cut but formed for strength.

Any suggestions from your end, from what you are planning.
George (down under)


So George what has it cost you so far in terms of machining?