> Jerry Hey wrote:

 >
 >   A fixture for boring the housings  has been built and we  have tried
 > it out on a 12-A housing.  Seems  o.k.      Also,   have  a good
 > start on the insert.      Any comments, criticisms at this stage
 > would be most appreciated.
 >
 >    The largest part of the insert is where the butterfly will be.  The
 > extra wall thickness  is for the  butterfly shaft bushings.  The
 > width of this can be cut down considerably from 1.250 to .5 inches.
 > The outboard end is 2" o.d. and internally tapers from 1.75 i.d down
 > to 1.5 i.d. for the butterfly.  The part sticking through the housing
 > will be trimmed to a flush fit and squared up but I don't want to to
 > do that until we are working on a 13B housing as the insert will
 > penetrate that housing deeper.
 > --
 > Jerry Hey
 >
 > Tailwind & Rotary Engine Support
 >
 > http://www.j-winddesigns.com
 >
 > mailto:j-winddesigns@thegrid.net

 Jerry,
 Looks great.  It's wonderful to see the neat things you can build
if you have a machine shop (and know how to use it!).  Sign me up
for a time slot to modify my 13B housings.  Why not use a 1.75
diameter butterfly?  Will this be an option?

 > Ken Powell

The reason for the 1.5 inch butterfly is timing.  The opening and
closing events that we are shooting for require a 1.5" opening from
top to bottom.  The port can and will be be made much wider
horizontally to increase its capacity.  I have made the insert wall
thick so that we have plenty of material that can be removed if we
want to go larger.      Also,  it might be possible to give the port
and the butterfly the same rounded rectangle shape which would
increase capacity of the butterfly while without affecting the
timing.   Much to learn when we get to Paul's dyno.

--
Jerry Hey

Tailwind & Rotary Engine Support

http://www.j-winddesigns.com

mailto:j-winddesigns@thegrid.net

 
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