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From: Bulent Aliev <atlasyts@bellsouth.net>
Subject: Re: [FlyRotary] Re: EC2 mixture changes
Date: Sat, 30 Dec 2006 20:09:03 -0500
To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>

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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