Jerry Hey wrote:

Paul, in the attached drawing, the part of the injector that the
clamp
fastens to is  longer than my "stock" Mazda injectors.  Is the one
you
drew also a Mazda injector?  Further, what injector  do   you
recommend
  for my application?     If I build the clamp as shown,  it will
be
taped for fuel line hook up similar to what Klaus did (no hard
fuel
rail).  I assume I  need a regulator before the return to the tank
These injectors will be aimed right into the bell mouths, but how
far
from the bell mouths should they be?  There is also the issue of
nailing down the clamp inside the box.   Clearly I  need help with
the
final design.   Jerry

p.s. can you recommend a text on fuel injection?

The injector in your picture has something around the feed barb.
Perhaps
it is a seal of some sort. Mine do not have that part and the barb
is 5/8th of an inch long. Try removing it. I also remove the
plastic
on the injection end as well. Here is a picture of an injector when
that stuff removed.

Paul Lamar

Paul,  can you design the clamp so that it holds the injectors
vertically?  That will cut down on stuff blocking the bell mouth.
I
would like the clamp rotated 180 degrees so that I can drill and tap
the base to screw the clamp down to the plenum floor.    Thanks,
Jerry

Something like this?

Paul Lamar

Paul,  the way I have been imagining this,  the injectors are fully
inside the plenum.  The plenum box size is not yet determined but
something like 10 inches square 4 inches deep is entirely possible.
Jerry

Sounds like you have a death wish :) You don't want the wiring
inside that box. That box by design has a stochimetric(s?) fuel air
mixture which
will make a great big boom waiting for a source of ignition.
My insurance company that handles my liability insurance will
not let me design something like that. Just kidding all you
ambulance chasers out there. I have no deep pocket insurance company.

This is an easier, cleaner and easier to maintain. The injectors
just fit in a hole in the outer wall of the plenum. The fuel rail
block holds them in place. The wiring is easy to get to.
The plenum is made from a chunk of four inch square alloy extrusion.
Simple and cheap to make.

Paul Lamar

I believe that  last spring I originally asked about aiming the
injectors directly into the bell mouths as opposed to installing them
in the runners and only then learned that it had been done before.  I
think a drawing was published that showed the injectors inside the
plenum.  I then asked about the danger of explosion and was reassured
that the current was not enough to create a spark. Maybe I am
remembering it all wrong.   I'll be interested in reading further
responses about this in the next few days.

Anyway,  no I do not want to create a bomb.  And I do like  your design
for mounting the injectors.  That is what I was after.  The remaining
issues are air filter and ram air.     If you finish the design for me,
I will build the first edition before the end of the year.   Does Rhino
have the capability to produce a standard 3 view with dimensions?
Thanks,   Jerry

This I think this what you saw. The driver is clothed in a fire suit and he can slam on
the brakes and jump out :)

Sure on the 2D drawing. I can also send an IGES. What drawing program
are you using again?  The tricky part is the fuel rail clamping block.


Paul Lamar
 
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