Jerry
Good to hear you are making progress on
the TB. I went back and check my drawings. I used a 1.75” ID (is this
correct?) which tapers to a 2” at the plenum. I think I will reduce or
eliminate the taper because it was a little hard to get the CF on the foam form
and to allow placement of the fuel injector boss anywhere on the runner.
Alex
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Jerry Hey
Sent: Monday, July 05, 2004 6:56
AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Carbon
Fiber P-Port manifold update
On Monday, July 5, 2004, at 01:51 PM, Alex Madsen wrote:
I have been doing
a lot of drawing this weekend for my manifold design. I have been mainly
working on a P-port design because it is the least complicated and has a large
(relatively :) market potential.
There was concern that I had fuel
injectors on the hot side of the engine on my last design. I think that
my current design should address this concern while allowing those that want to
experiment with fuel injector placement the ability to do so. Attached are
picture of the design. The fuel injector can be conceivably placed at any
location along the manifold runners. The drawing show a single injector boss
however double injector bosses are possible. The fuel injector boss
currently sits at a 45 degree angle to the runners. I plan to use high temperature
flame retardant Garolite (fiberglass composite) for the injector boss. The
injector bosses are attached to the CF runners with epoxy at the desired
location. The epoxy will also fill in any gaps. The force trying to
dislodge the injectors, even during a backfire is relatively small because of
the small area of the injector hole that goes into the runner. Injectors are
not attached to a fuel rail but rather an injector cap with NPT threads for an
AN T fitting. This allows easy customer configuration of injector layout and
eliminates the bulk and custom machining of a fuel rail (of course if you want
to use fuel rails you could). The injector is retained by the
clamping force of 2 bolts that run between the cap and boss.
The manifold runners will likely 2”
ID and made of 2 ply carbon fiber and high temperature epoxy. I have not yet
determined what I will use for as a form for the CF. I am leaning towards wax
but foam is also an option. The current length of the runners is 21.5”
and 25.7” including Jerry’s throttle body. The plenum can face
forwards or backwards and has a volume of 1.2 L. I am not happy with the
plenums shape and I will probably redesign it one of these days.
As a side note to Jerry
How goes development of your throttle
body? Is there any chance of adding a flange to your TB? It would make
attaching intake manifolds much easer.
Alex Madsen
Alex, the throttle bodies are done and awaiting installation which in turn is
awaiting the completion of the exhaust system before I tear the engine down.
The present throttle bodies will attache to the runners with hose and clamps. I
will think about the flange. The runner/throttle body diameter is two inches
O.D. not I.D. Assuming the fuel rail has to be straight (is this necessarily so?),
then the injectors, two for each runner, have to be in the same plane and
parallel to each other. That is a very nice drawing. Jerry
<pp2 asm front.jpg><pp2 asm.jpg><injector assembly
exp.jpg><injector assembly.jpg> Homepage: http://www.flyrotary.com/
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