I agree with you on the Russell manifold and I am doing further
work
on it.
Hopefully I can get the plenum box straight up and down. Hang on
more
to come.

BTW To calculate the center line length of a 3 inch center line
radius bend
multiply the angle by .0524. For an example a 45 degree bend
center
line
length would be 2.356 inches long.

BTW jerry cut down the length of the TB's as every little bit
helps.
You don't need the hose barbs on the the prototype since the
manifold
is under vacuum almost all of the time. All you need is 5/8 of
an
inch
hose barb.

Paul Lamar

This is it. Uses a 6.5 by 4 by 4 Zero box with alternator
flapper.

Bends 45, 180, 90, degree front tube.
Bends 20, 90 degree  back tube.

Move the starter up as far as possible.

Adjust the length by moving the whole works closer or further
from the engine. You can also adjust the length by moving the
plenum forward. Moving it aft is not possible.

The neck bone is connected to the back bone and the back bone is
connected
to the hip bone etc., etc., etc., so don't make any other
changes.

Everything fits under the stock cowl.

Current length is about 20 inches.

Paul Lamar

I went to the Zero site but could not locate the boxes you are
talking
about.  Why are we using these boxes?  I must have missed a
critical
explanation.  Do they come with the 3 inch ports and flapper
valve?
Jerry

Make up a company name. Tell them you need several hundred a year
and get them to send you a catalog. If they won't I can scan some
of the pertinent pages. You already have a few.

No three inch ports but they do have a nice bolt on lid that can
save a
lot of detail work on your part and provide internal access. Also
saves
welding 4 to 8 seams. Also provides a nice 1/2 inch radius all
around.
The
cosmetics of that are worth it alone. It just looks professionally
done.
Very very important if we are ever going to gain wide spread
acceptance for
the rotary.

Paul Lamar

Injector bosses to accept an 0 ring to prevent leakage where the
injectors enter the plenum will have to welded  in before the box is
assembled.        Jerry

No. Just drill a 5/8 hole in the side of the box and use
a 5/8th ID O ring between the injector and the box. A bit of leakage
here is not a problem.

Paul Lamar

Or,  the box could be turned so that the injectors go in the lid.
Jerry

Yes but then you have to disconnect the cool air plumbing.
If the lid is on top that makes it easy to inspect and service inside
the box. Flapper valve etc., etc.

BTW the fuel rails hold the injectors in place so no injecter boss is
needed.

Paul Lamar

Paul, the article  "How to Fabricate an Intake System" goes into some
detail about how to make the injector bosses that go inside the  plenum
including how to machine in a relief to capture the O ring and to get
good sealing.        Jerry

This is different Jerry. You don't need "good sealing".
Small air leaks with Tracy's system do not matter. But if you want to
spend extra time and money by all means do it. :)

Paul Lamar
 
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