>
> I got a price on the tiny holes from the laser guys in Simi Valley.
> $250 minimum set up charge. Too much for me for R&D.
>
> I talked to Klaus about how his Ellison has worked and he thought
> it was not bad but the venturi part of it restricted
> the airflow compared to his EFI setup on his O-200. I assume he has
> a custom throttle body on there now. He got more HP with the custom
> throttle body.
>
> Here are some pictures of the Ellison carb he took off.
>
> Klaus also mentioned that the exact time the fuel was squirted
in was
> critical
> on a 2500 RPM aircraft engine (+/- 30 degrees) but he agreed with
me that
> it matters
> not on a 7500 RPM engine. Another hidden advantage of the rotary.
>
> The next 3D is the mechanical low pressure fuel injection I am
going to
> spend my R&D budget on. Both Hurant Karribian and I will be
working on
> essentially
> the same thing.
>
> The pressure regulator soak in 100LL gasoline was successful. I
could see
> no
> deterioration in the air pressure regulator plastic parts. Of
course that
> is 100LL auto fuel with alcohol could be another matter.
>
> BTW I did some further test on JB Weld by thinning it with 25%
acetone
> and it became very easy to pour. It set up but I can't vouch for the
> strength as I did not test it. With a welded in SS P-port tube
> we don't need the strength so sealing becomes its only function.
>
> Paul Lamar ...No rotor no motor.
Paul,
Excuse the ignorance, but I know very little about different
carbies. What
is the little short jet at the bottom of the long tube and what is
the short
tube with the 3 holes for.
George ( down under)
I don't know the answer to the first question but the second question
answer is a pito tube. The air pressure is proportional to the square
of velocity and that is fed into the pressure regulator. I suspect
that raises the fuel pressure for a richer mixture. Tailoring all
these conflicting signals is a night mare and as Klaus pointed
out extremely time consuming. Ellison has been developing this design
for years. I don't think I want to go through all that.
Paul Lamar ...No rotor no motor.
Time consuming, yes.. I don't think the ramp design is going to be any
better in that regard, but would be happy to be wrong..
Computers are great!! :)
Matt-
I only have the precise ramp shape to deal with. I hope to be in the ball park
from the get go with a linear ramp. I only have to have the mixture between 10:1
and 18:1 over the range and the rotary will run. Changing the pressure regulator
should handle the leaning and fine tuning. One of the things not mentioned is:
as the slide becomes mostly open the vacuum signal pretty much goes away.
All manual slide carb suffer from this problem. The constant vacuum types
less so. That I think is the reason for the pito tube on the Ellison.
It automatically compensates for this effect by increasing the fuel pressure.
No doubt a 28 pin $30 PICAXE that has four analog to digital converters and
four $30 pressure sensors could monitor all these pressures and
tailor the fuel feed precisely. The trouble is the computer nerds around here
are in the minority and people don't appear to want to learn to
program... even in simple BASIC and deal with the electronics. They would
rather deal with simple mechanics. I could be wrong.
Here is a poll.
PICAXE Yes or no?
The results will be kept anonymous. I will tally the responses so nobody
else will know how you voted.
Paul Lamar ...No rotor no motor.
The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site.
http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.