The trick is different adapters from the oval shaped or double

circle ports to round tubes. Fortunately help is on the way.
Rhino has a command called "unroll developed surfaces" that
generates a pattern that is then cut out of soft .063 6061-O and
rolled up and welded along the seam. That gives you an adapter
that can then be shaped into what you need without any
stretching of metal.

Paul Lamar

Paul -

I have long thought that simple intake adapters for the various

rotary engines were the way to go.  The adapters would have a
flange at each end - one bolts to the engine and another bolts to
the round intake pipe flange.

My concern was the number of variations required:
        1) Multiple rotary engines
        2) Multiple intake pipe diameters
        3) Multiple intake configurations
                a) Separate pri & sec runners
                b) Combined pri & sec runners
        4) Multiple porting variations
        5) Multiple angle adaptations
                a) straight through
                b) built in 90 degree turn

Once these adapters became available, we could simply weld flanges

to the intake runners and bolt everything together.  It should
make for a very light induction system.

I think this is worth pursuing.  I'd be more interested in these

adapters than your previous manifold casting.  (Good job, by the
way.)

I'd vote for a straight through combined pri & sec into a single

runner of the same intake area (2"?).  This would be the simplest
for the builder.

Ideas?

--
Thanks,
-Vince Orton

I have a pattern already for the second gen four port. Maybe I will

get a bunch cast up.

Paul Lamar

It is right in here where most people run into fabrications problems.
You can't just squash the pipe flat. The area becomes less than the
round part of the pipe.

Yes the intake manifold flange is not shown.

Paul Lamar

I was kind of curious what a straight manifold would look like. Not
likely to fit in the average Long EZ. Might fit in the wing of a twin
with partially buried engines. The firewall is only 24 inches in
diameter. No cooling rads or muffler.

Paul Lamar

Matt Prather wrote:

Long EZ's (and Varieze's ) have quite a bit of room between the
valve cover on an O-2xx and the wing root.  On my Varieze it's
probably about 12" - maybe more.  Further, there isn't really
anything structural in that part of the wing (that couldn't
be worked around).  The only big issue is that the wings are
styrofoam, which is dissolved by fuel.  If the injector rail
were mounted out in the wing, and it ever leaked (count on it),
you would likely have to repair the trailing edge of the wing.
Not an insurmountable problem.  If you designed in a closeout
with a drain, you could minimize the damage.  Is there really
any benefit to the straight runners?

It's 64" from wing root to wing root.  I would guess that we
could fit the runners in there.

A link to a 3 view Varieze drawing:

http://www.webpak.net/%7Emprather/Airplanes/3-side.jpg

Regards,

Matt-

Its well over 20 inches out from the block with plenum and fuel
rail. 26 inches out from centerline. It might fit if we put a couple of
jogs in it.
I really don't think straight is all that important.
I think if it came straight out it would be above the wing anyway.
Do you have a more detailed drawing showing the thrust line relatives
to the top of the spar?

Here is a 3D of a Long EZ. Looks like it will come straight out over the
wing.

Paul Lamar

Joseph M Berki wrote:

Paul,
         I think the 18" long pipe that you and Jerry were discussing for
the  peripheral port will fit in the Limo EZ space between the engine and
the wing inner root.
Joe Berki

Perhaps it will but it will need a couple of kinks. I'll do a 3D in a few days.

Paul Lamar
 
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