From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] EC2/3 Tuning
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Tue, 24 May 2022 09:33:14 -0400
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Here's my opinions:

No one should be flying an EC2/3 equipped airplane without being fully 
trained on their functioning and installation. Without that, they would 
have no chance of in-flight trouble shooting. What to do if an injector 
clogs? What to do if a coil fails? and so on.

Having extra mixture range is a feature, not a liability. Say your fuel 
pump goes weak or filter starts clogging, pressure regulator goes bad or 
fuel pressure otherwise starts dropping.

Having to rely on a gut reaction of blindly turning the knob all rich 
without listening to the engine would disqualify the pilot from flying 
that airplane.

Having said all that, should be no harm in experimenting with Mode 2. 
You can always reset it:

If you have an EM3 engine monitor, you can check the setting of this 
parameter on the engine info page by holding the Acknowledge button 
(button 4)  and then pressing UP (button 1).  The dynamic range 
parameter is the 6th (next to last)  number on line 4.  The value is 
displayed in hexadecimal format.
Resetting Injection dynamic range  to factory default setting
1. Turn the EC3 power off.
2. Select mode 2 on the Mode Select switch.
3. Press and hold the Program Store switch.
4. While holding down the Program Store switch, turn on the power switch 
to the EC3.
5. Keep holding the Program Store switch for about 1 second and then 
release it.
6. ... will now be restored to factory settings and you can begin 
programming after starting the engine.
7. Return the Mode Select switch to 0.

Check your EC2 manual.

Finn

On 5/24/2022 1:48 AM, Stephen Izett stephen.izett@gmail.com wrote:
> Hi people.
>
> I have a question about tuning the EC2/3’s and particularly Mode #2 'Dynamic Range Adjust'
>
> I have left Mode #2 at the default setting and no problem tuning. However here is the thing:
>
> I have some friends that are very experienced pilots (unlike myself) and on flying the Glasair they have asked if it is possible to adjust the mixture control so that at:
> 1. Full CW rotation sets full rich which in my experience and understanding is ~0.85 lambda or 12.5:1 AFM, and
> 2. Full CCW rotation sets full lean, again I’m thinking ~1.07 lambda or 15.8:1
>
> It's really point 1. I’m interested in.
>
> What my friends are asking is that they are confident that behind their Lycomings in an emergency they just push that Red knob all the way in and get on with flying the aeroplane.
> In my setup, if I turn the Mixture Knob full rich it would probably make the fan stop. My Mixture Knob set at 12 O’clock is about Stoichiometric and best power is less than 2 O’clock.
>
> For them, this is a significant safety issue.
>
> But I’m struggling with the description in the Programming Guide.
>
> Can anyone confirm that adjusting Mode #2 'Dynamic Range Adjust’ will change, well, the 'Dynamic Range' of both the mixture correction table and the Mixture Knob.
>
> Could I reduce the Dynamic Range parameter so that once the MCT is set correctly I will then have a situation where quickly turning the Mixture Control FULL CW the Engine will be at Full Rich.
>
> If it does what I’m thinking/hoping, the adjustments required in the MCT will be larger.
> Currently my MCT adjustment amounts are positive and negative about half of the available range (-70 & +60 decimal)
> So by reducing the Dynamic Range by approx. half, will I then need the full +- 127 decimal range of the MCT and will the Mixture Knob then be approx half as sensitive?
>
> I didn’t want to mess up my tune before asking if someone can confirm how Mode #2 works.
>
> Thanks
>
> Steve Izett
> Renesis 4 port RD1-C EC2 EM3
>
>
>
>
>
>
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