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