I had pretty good success today getting
the surge out of the staging region. First, after Steve suggested
it, I noticed that my staging was happening right at 3800 rpm, when the EC-2 is
changing tables. So I raised the MP for the stage up an inch to get it
away from this area.
Then I used mode 6 to enrich the mixture
after the stage. It took quite a bit of movement of the program knob to
do it. I wound up with it set about 4 o’clock. Now the stage
is smooth as I go back and forth across it.
I then went back across the MAP table with
mode 1 and smoothed it out. Now the mixture is pretty steady from idle to
WOT. I think it may be just a hair rich across the range and will
probably work it down some, but all in all pretty good results.
Very cool day in the 60s. Nothing I did
caused the temps to go above 180 or so water and 140 or so oil. The cowl
is not on presently so it would have been hotter had it been on. I am
leaving it off till I finish the tuning process.
No leaks!
Bill B
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Saturday, November 06, 2010
1:30 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Re: Adjust
BELOW Observe ABOVE
For what its worth, Bill - my adjustment (enriching) were
all made to bins immediately after the staging jump. I had to adjust 3-4
bins, adjusting just one did not solve the problem
Sent: Saturday,
November 06, 2010 12:58 PM
Subject:
[FlyRotary] Re: Adjust BELOW Observe ABOVE
Ed,
I was thinking of trying that. I
couldn’t figure out which bins are not correct. For example, in my
case, the bins go from 43-44 to 47-48 when it jumps. So I didn’t
know if I should adjust the intervening bins (the ones it skips) or one or the
other side of the jump.
It seems that you adjusted the receiving
bins??
Bill
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Ed Anderson
Sent: Saturday, November 06, 2010
12:52 PM
To: Rotary
motors in aircraft
Subject: [FlyRotary] Adjust BELOW
Observe ABOVE
Bill, if you don't like the idea of using Mode 6 because it
may cause an adjustment of all bins above staging - here is an alternative
suggestion based on the way I coped with the situation.
As I mentioned my engine would also bog due to leaning
during the staging process - being too lazy to read the manual and spot Mode 6
as a possible solution, I used the "brute force" method. I
observed that when my engine staged my bin pointer would jump from the 30 some
region to around 60. It was immediately after I observed the manifold
pointer to make that jump - that the air/fuel ratio went lean and the
engine bogged.
So from the lean indication I was getting , I presume my engine
was (for whatever reason) not getting adequate fuel in the bins around
60. So I started increasing the MAP values in bins 60-65 higher
(enrichen) in incremental steps. I found that each adjustment richer in
those bins caused the bog to become less severe giving me a comfortable feeling
I was headed in the correct direction. Eventually the bog disappeared and
my bin values above 65 were not affected because I did nothing to change those.
You might want to try that method - but I would give Mode 6 another
try by adjusting below staging and checking results above staging.