Rino,
I didn’t make any change using mode 3. I only checked the
mixture at 22” and it was pretty well at the proper place without making
any changes. That makes sense with the yellow injectors because at 22”
all four are running and they put out close to the same amount of fuel as do
the red/blue combo.
Do you know what your mode 2 parameter is set at now? Do you have
an EM-3? If so, I think you can read this parameter by holding button 4
and pressing button 1. the dynamic range parameter will be the first
number on line 2. I would appreciate knowing what you have it set at.
Just to clarify. When you say “too far off the zero point”
you mean on a range of -127 to +127 you are close to zero, in the center of
that range??
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Rino
Sent: Sunday, February 21, 2010
8:20 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Some
assistance Please!
I will give you my understanding of setting the fuel mixture
I did a couple of weeks ago. I reinstalled the Renesis after overhaul and
the EC3 made a trip to tracy's
shop where he replaced one chip. I also changed my injectors, now I have
4 yellow injectors, two primary and two secondaries.
I adjusted with mode 3 as you did, probably not as much.
Then I adjusted mode 2,I turned the program knob clockwise,
then I pressed the program store switch about 10 times because the mixture
was too rich below staging point, I wanted to get a leaner mixture below the
staging point. That gave me a descent situation where the auto
mixture adjust (mode 9) would not go too far off the zero point. I
think one has to spread the mixture difference between below and above the
staging.
First I changed the staging point to between 15 and 16
inches manifold. The factory staging point is set at 19 inches.
This does not work for me because 19 inches of manifold pressure is at about
the rpm I use when I come in for a landing. I do not like the engine to
hesitate when I am getting ready to land, I got other more important things to
do at that time.
I used the auto adjust quite a bit around the staging point
before it got to be acceptable.
After using auto adjust, there is a step in the map table
between positions 44 and position 45, that is where staging occur in my
case. I still can tell when staging occurs but I now find it quite
acceptable.
----- Original Message -----
Sent: Sunday, February
21, 2010 8:33 PM
Subject: [FlyRotary] Some
assistance Please!
First, some news..
I recently redesigned my cooling system due to unable to run the engine
for more than about 20 min at high idle without it overheating. Now I
have the good problem. Granted it was cold..low 60s. But I was not
able to get my oil above about 145 and the water above 185! I ran
it full bore till I got tired of holding the brakes! I still need to do
some work balancing the air between the oil and water. And I didn’t
have the cowl on, so the problem is not completely solved, but I am on the
right track!
Now the question.
I have the Renesis that has the very small red primaries and the very
large blue secondaries. I recently changed them to all yellow. This
removes the need to balance the flow so much when it stages. The total
output is very similar between the two systems. Now I have a larger flow
when on the primaries and the secondaries kick in with a smaller change.
I removed the large secondary option using mode 6.
So I checked the mixture at 22 inches manifold pressure and it seemed
fine with mixture at center setting so I deemed that I didn’t need to
change the fuel flow with mode 3. BUT when I started to let it auto tune,
I noticed that it was setting all the bins to -127 until after it staged, then
it started to build the graph that you normally see. It stages at 20
inches manifold pressure. Is that the recommended pressure? I
expected 15”??
So my question is…Should I set the mode 3 at a lower
setting? This will affect the entire range so I am concerned that I will
not have enough fuel at WOT if I do that. Should I make an adjustment
using Mode 2? I don’t really understand what dynamic range is??
What are your thoughts?
Thanks,
Bill B