Jerry Hey wrote:
Paul, I think you were going to send me an Auto Cad
drawing
of
the
fuel rail. I can use that when you get the time. Thanks,
Jerry
OK will send by private email as even the zip file is too big
to
publish.
Paul Lamar
Don't do more drawings. I can easily get the dimensions
from
what
you have already sent. Thanks, Jerry
I knew you would figure it out :) Dimensions on drawings are
for
people
without computers and NC tools. Now a days a 3D like that is
fed
into
a program that generates
a NC machine tool program with out any one ever actually
looking
at
the dimensions until
the part comes out the other end :) It was Monty that convinced
me of
that a couple of
years ago.
It is a good thing too as for some strange reason dimensions
don't
come across
well in either ACAD dwg, iges, or dxf. IMHO it has to do with
the
dimension fonts different
drawings like Rhino ACAD Solid Works etc. etc. choose as
standards.
On the other hand if you are making a part by hand you need a
drawing
with dimensions in front of you.
Paul Lamar
I am thinking of having the fuel rails made in a local machine
shop.
They will definitely need measured drawings. Jerry
Let me know if loading it into ACAD and using the ACAD
dimensioning
facility
does not work. In any event you need to make a prototype to check
the
fit.
Do you have a Mazda fuel rail pressure regulator? If so loan it
to
the
machine shop so they can match the threads.
Have you decided on what you are going to use for fuel plumbing?
I recommend 3/8 minimum. AN -6
Paul Lamar
Yes, AN 6. We don't have enough demand for this fuel rail to
justify
CNC. Right now, I just need one. Jerry
If you make it longer and don't drill out the ends for taping and
don't
drill the injector holes it will work for a wide range of
installations
including my own. Just drill the long 3/8 inch hole down the
length.
Consider me having ordered one for this installation. 11" long
ought to be plenty for a two rotor. Have your guy make two.
Bill Scherts, do you have your fuel rail already?
Paul Lamar
Paul, I do not have it yet, but I do know that the injector plugs
have to
face to the sides in order to fit. No clearance for them to be on
top, and
they won't fit facing down. This means you cannot do it as a "T"
machined
part as shown in the transparent fuel rail.
Bill Schertz
KIS Cruiser # 4045
That is on our KIS cruisers of course that have a very limited over
head.
OK Bill thanks for the heads up.
I'll have to face the center two inwards towards the side
and the outer two towards the outside and machine some of the T away.
Do you think that
will work? I'll do a 3D of what I am babbling about. I can still
start
with what
Jerry is making. This is not precisely the needed spacing but it is
just
to illustrate what I am talking about. the space been the two center
injectors
on the KIS is about four inches.
Paul Lamar
Paul,
1) Without the rubber cushion (not o-ring) on the injector, the
fuel
rail housing will bottom out on the angled electronic hook up (what is
this called?)
2) Please include in the drawing how the fuel rail will bolt to the
plenum.
3) I don't get the significance of the T part of the fuel rail if
it
can be eliminated for as you have shown for the Kiss. It still has
to
have a minimum height to provide material for the .400 bore. I would
think it would need at least .125 thick wall maybe more.
jerry
Yes on number one.
Almost anything will work. You just need to weld tabs on the plenum
and drill holes in the fuel rail to suit. I'll add it to the 3D.
I did not completely eliminate it on the KIS I just cut part of it away
in the center to allow rotating the injectors so the connectors did not
interfere with the top of the KIS cowl. A KIS has one of the lowest
cowls
relative to the thrust line. You need not worry about that as I can
machine
them down for the KIS people.
BTW you could fab this with 1/2 square steel tubing and short welded on
tubes where the injectors go. Your choice.
Paul Lamar
Paul, do you think fuel traveling from the injector tip to the bell
mouth will be blown down stream by air entering the end of the plenum?
Jerry
Possible. There is a lot of air going in each tube. Due to the pulsating
characteristic of a plenum there is probably a lot of turbulence in there.
Hard to say what is going to happen. It will probably also change
with RPM. If there is problem you should see it in the EGT's.
Paul Lamar
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