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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: EC2 mixture changes
Date: Mon, 1 Jan 2007 07:52:48 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

Thanks Tracy. Since I had to remove my electric nose gear and send it =20=

for service, I'll have time to sit in the plane and play with the EM2 =20=

and read the manual at the same time. Hope something will sink in :)
Buly
On Dec 31, 2006, at 12:36 PM, Tracy Crook wrote:

> Buly,
> Since you said you got a curve in the MAP table after resetting the =20=

> table, I assume you did the reset with the cold start switch up =20
> (on).   This loads the MAP table from my engine which may or may =20
> not work for you.  If the cold start switch is down,  resetting the =20=

> map table clears it to a flat line at mid scale which is the normal =20=

> starting point for tuning the engine if the curve from my engine =20
> does not work well on your installation.
>
> Now the confusing part.  You may not have had the cold start switch =20=

> up but if you had the injector switches off, they also activate the =20=

> cold start switch input to the EC2.
>
> Even more confusing, if your injector switches connect to +12 even =20
> when the EC2 power is off, turning them on will provide power to =20
> the EC2 through the injector lines.  Explanation of why is too long =20=

> to go through so just accept this fact.   This will prevent you =20
> 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 =20=

> EC2 Mode)  always have the injector switches on BUT make sure you =20
> master switch is OFF,  THEN turn the EC2 power on.  You will now =20
> (presumably ) still not have power to the EC2 or injectors if your =20
> master switch is REALLY a master switch.     Now you are ready to =20
> do the reset.  Select the appropriate switches & modes explained in =20=

> the instructions and then turn the master switch ON.   Now the EC2 =20
> will have done the expected reset function.
>
> Note that the MAP table at the low rpm range (0 =96 63) is  normally =20=

> flat  after the staging point or the point at which the engine is =20
> running above the low rpm threshold (about 3000 rpm).  This is =20
> because you never really use this portion of the MAP table so it is =20=

> not surprising that your engine ran relatively OK.   Above this =20
> threshold, the EC2 switches to the high rpm table (64 =96 127).  Did =20=

> you scroll ll the way through all map table addresses (0 - 127)?  =20
> You should have seen the curve resume somewhere in the upper range =20
> between 64 and 127).
>
> To properly understand what you are seeing in the MAP table and =20
> what it means, there is no escape from having to read and =20
> understand the theory of operation in the installation and setup =20
> guide.  Sorry, reading that dry, boring stuff is part of the price =20
> you pay for running an alternative engine.
>
> Tracy
> ----- Original Message -----
> From: Bulent Aliev
> To: Rotary motors in aircraft
> 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 =20
> 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 =20
> 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 =20
> 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
> >
> >
> > --
> > Homepage:  http://www.flyrotary.com/
> > Archive and UnSub:   http://mail.lancaironline.net/lists/flyrotary/
> >
>
>
> --
> Homepage:  http://www.flyrotary.com/
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>