This is our latest thinking on the intake manifold.
It has up sides and down sides. One down side is it
requires four tubing bends at about $10 to $12 bucks each.
The tubing bends are cut with a 1/2 inch straight section
so they can be bonded or welded to the casting.

The up side is it can be ported with a die grinder to match
the 1993 and later turbo engine's larger ports. The wall thickness
will be about 3/8 of an inch to accommodate this.

It is somewhat cheaper to make the casting and a lot simpler
to make the pattern. We think but are not entirely sure about this
yet.

The dimensions on this drawing are not the gospel truth.
We are working on new drawings.

What do you all think?

Paul Lamar

BTW the fact that the 1993 and later engines make more power with larger

ports

destroys the myth that velocity in intake runners is some how
an advantage :-)>

Wish I had the time and resources to put into a project like this because it
is badly needed.  My personal preference would be to integrate the injector
mounts into this portion of the manifold to get the most "work" done in this
part.

Won't bite on the velocity argument today!  Bring all theories to next
years' Rotary Aircraft race in the form of hardware and let's see what works
:-)

Tracy Crook
tcrook@rotaryaviation.com
www.rotaryaviation.com

We are making good progress on the last design. Tom Kendall has located
a foundry in his home town that will work with him developing the pattern.

When the time comes we will offer a group buy and then make some that you can
distribute. Sorry about no injector bosses. No room as the turbo is right
there. IMHO I think the best place is over on the other side away from the 
heat of the turbo anyway. Jim at Racing Beat tells me that gives better BSFC
for an aircraft engine as well.

Paul Lamar
 
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