I would use Holley parts where ever possible
when building the fuel pressure diaphragm regulator.
Namely the diaphragm and the float needle and seat.
No point in reinventing the wheel.

I'll work on integrating the pressure regulator
in the 3D dwgs. A center mount should be just about right.


---------------------------------------------

Randy,
Can I borrow that spare Ellison carb you have?
I am going to copy it.

I can pick it up tonight about 7 PM if
that is OK.


Paul Lamar


Paul,  On the changes to the fuel tube in the "both-holes jpg"  it looks
like the fuel tube should be anchored to the cable end and end just past
the far side of the throttle opening for the flywheel end rotor  port.
It looks to me that  as shown it would leave the end of the tube
unsupported.Any  inaccuracy in the tube position could allow the slide
to hit the end of the tube or necessitate a counter bore for it to enter
into the opposing side of the slide. Also the opportunity for fuel
orifices at the idle throttle opening of the slide would be reduced.


george grimes

I'll take another look.

------------------------
Here is what it is going to look like.
The square box is the fuel pressure regulator.
The guts are not done yet.

----------------------------------

The brass tube is .120 inches in diameter
and the .010 to .012 holes all appear to
be perpendicular to the plain.
Sketch on the right.

Hole centers look to be about .020.
Diaphragm diameter is 1.5 inches.

Paul Lamar




Hi you Guys

The regulator needs to be the demand type Ellison and copied by Rotec,
otherwise you may as well use the Revflow (aka controlled leak)

I e-mail Rotec before I purchased to check on any patent infringement they
said that the Ellison patent had expired.

Here is a link that may be helpful it list a low cost diaphragm a way down
near the bottom.  Nice pic of the inside of the Ellison regulator.

http://www.n56ml.com/fuel/index.html

Idling if you look at the pic of the Ellison and compare it with the pic of
the Rotec you should notice on the lean end of the discharge tube the
Ellison has an extra hole which is the idle jet and non adjustable, where as
the Rotec has no hole an a separate discharge (which I haven't found yet (ok
I have not looked too hard).

The Rotec demand regulator is separate which I don't like, but the reason is
that it has a central valve behind the big silver bolt so that by depressing
the button the fuel is admitted to aid starting, tickler style.  It just
occurred to me it would be easy to mod an Ellison see attached pic.

If I have repeated something already posted or of no use apologies' in
advance.

Have fun

Clive