Yah I can make a double injector boss no problem.
I just do not like how far off
center the injectors end up.
For the plenum, are you envisioning a bell
mouth with no air filter? If yes that would make construction super easy. I could
eliminate the plenum and put bell mouths on the runners.
It would also make getting the ideal tuned
length easy.
Alex
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Jerry Hey
Sent: Monday, July 05, 2004 4:45
PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Carbon
Fiber P-Port manifold update
Alex, 1.75 I.D. x 2.0 O.D is what the throttle body is
where it joins the runner. Use a bell mouth at the plenum. That's what my
current thinking is. The injector bosses are the hard part. Can you do it the
way Paul has drawn it up?
On Tuesday, July 6, 2004, at 02:24 AM, Alex Madsen wrote:
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 OfJerry 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
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