Buly,
Since you said you got a curve in the MAP table
after resetting the table, I assume you did the reset with the cold start switch
up (on). This loads the MAP
table from my engine which may or may not work for you. If the cold start switch is down, resetting the map table clears it to a
flat line at mid scale which is the normal starting point for tuning the engine
if the curve from my engine does not work well on your installation.
Now the confusing part. You may not have had the cold start
switch up but if you had the injector switches off, they also activate the cold
start switch input to the EC2.
Even more confusing, if your injector switches
connect to +12 even when the EC2 power is off, turning them on will provide
power to the EC2 through the injector lines. Explanation of why is too long to go
through so just accept this fact.
This will prevent you from
resetting the MAP table at the time and way that you expect.
So, in order to get the expected results when
doing a reset (on any EC2 Mode)
always have the injector switches on BUT make sure you master switch is
OFF, THEN turn the EC2 power on.
You will now (presumably ) still not have power to the EC2 or injectors
if your master switch is REALLY a master switch. Now you are ready to
do the reset. Select the
appropriate switches & modes explained in the instructions and then turn the
master switch ON. Now the EC2
will have done the expected reset function.
Note that the MAP table at the low rpm range (0
– 63) is normally flat after the staging point or the point at
which the engine is running above the low rpm threshold (about 3000 rpm). This is because you never really use
this portion of the MAP table so it is not surprising that your engine ran
relatively OK. Above this
threshold, the EC2 switches to the high rpm table (64 – 127). Did you
scroll ll the way through all map table addresses (0 - 127)? You should
have seen the curve resume somewhere in the upper range between 64 and
127).
To properly understand what you are seeing in
the MAP table and what it means, there is no escape from having to read and
understand the theory of operation in the installation and setup guide. Sorry, reading that dry, boring stuff is
part of the price you pay for running an alternative engine.
Tracy
----- Original Message -----
Sent: Saturday, December 30, 2006 8:09
PM
Subject: [FlyRotary] Re: EC2 mixture
changes
Hi Tracy and Al,
Today I looked at the MAP table. At the
beginning there 3-4 bars
going up from zero to 50% up after that all
the way to the end there
was nothing.
Just flat line with no bars
going up and down. Reset the factory
settings and now I have the
curves on the MAP window display the way
they are supposed to look
like. Did not have time to run the engine.
I'm surprised it run at
all :)
Buly
BulyOn Dec 29, 2006, at 12:23 PM, Tracy Crook
wrote:
> Good suggestion from Al, Buly. I can't remember, do
you have an
> EM2? If so, check the MAP table with the EM2
and get familiar with
> what the correction curves look like for
your engine (no two are
> exactly alike). Good idea to
check it periodically for any signs
> of data corruption if you
think something is amiss. So far, Al's
> controller is the only
one that I know of that has had this
> problem. Not unit
specific because it has happened on 3 different
> EC2s in Al's
plane so I have concluded that it is something unique
> to his
installation. I'd like to get to the bottom of it and any
> other reports would be helpful.
>
> Al and two other
composite aircraft have reported mixture changes
> when
transmitting on the radio. Sometimes the problem is frequency
> specific. I have identified a fix for this and it should
be
> implemented on any EC2 that exhibits this problem. A
.1 uF
> capacitor is added directly across pins 1 and 2 of the A
controller
> MAP sensor to eliminate this problem (B controller
is not
> affected). RFI problems are a bitch to
find sometimes. There is
> already a capacitor across these
two pins on both A & B
> controllers. The one on A is
only a couple of inches away from the
> sensor on the circuit
board but that makes all the difference. The
> part must be
physically close to the sensor to eliminate this RFI
>
problem. All future EC2s will have this added capacitor
installed.
>
> You can experience odd changes in the EC2 behavior
for several
> other reasons. For example, I have to
change the mixture control
> from the normal position when I do a
hot start and take off
> because the air temp sensor has
been heat-soaked from heat in the
> engine room. As
it cools off on takeoff, the mixture gets richer
> and I then
return the mixture control to it's normal position.
>
> Tracy
(autopilot installation hell almost over)
>
>
> -----
Original Message -----
> From: Al Gietzen
> To: Rotary motors in
aircraft
> Sent: Friday, December 29, 2006 9:58 AM
> Subject:
[FlyRotary] Re: Yet another non-event story
>
> > >I noticed
my mixture bar was going from lean to totally
> > desapearing.
Turning the knob to full rich was not enough.
> > I saw this a few
times.
>
> Buly;
>
> It would be interesting to know
if you had it previously tuned
> giving you
> correct
mixture. I have had on-going problems with spurious
>
changes to
> settings in the EC2. Carefully tune it one day, and
find things have
> changed the next, and have had tuning changes occur
during flight.
> I have
> noted changes in the
mixture table, stage point setting, injector
> pulse
>
width. Many, many hours spent trying to determine cause, but as yet no
>
explanation. It has been assumed that it is specific to my
> installation -
> composite pusher with EC control box at the
firewall, EM2
> acquisition module
> at the firewall,
display on the panel. The problem is primarily with
> controller A
which communicates with the EM2.
>
> This may not be relevant to
your installation, but it would be
> worth paying
> close
attention to getting it tuned correctly, and see if it stays
>
that way.
>
> Al
>
>
> --
>
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