From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] EC2/3 Mixture Correction Table
Date: Fri, 18 Feb 2022 14:05:18 +0800
References: <list-684953@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-684953@logan.com>
Message-Id: <E70FA4C2-63B0-401A-9D11-2981886F85EF@gmail.com>

Thanks Finn, thats really helpful.
I=E2=80=99ll try it out.=20
My EC2 works with Autotune. I think the version of the EC2 code Tracy =
gave me might be the same as the EC3.

Steve


> On 18 Feb 2022, at 8:36 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>=20
> I'm using the O2 signal from the EC3. Not sure if the EC2 has that =
option, but if it has auto tune I'd think so.
> When using the EC3 O2 signal, the EM3 looks at EC3 ENGINFO WIDEBAND =
bit, so it's automatic.
>=20
> =46rom the EM3 manual:
> EM3 OPTION SELECTION VARIABLE  DEFINITIONS
>=20
> CHANNEL  9,         O2 SENSOR (MIX)
> OPTIONS AFFECTED   -      O2  Sensor Installed (Parameter 2)
>              Air Data option enable    (parameter 3)
>              EC3 O2 Sensor select    (Parameter 4)
>=20
> PARAMETER  2 (sensor offset)     Set to 1 if O2 sensor  (connected to =
EM3)   0 if not.
>=20
> PARAMETER  3 (low limit alarm)   Set to 1 if Air Data option =
installed,  0 if not.
>=20
> PARAMETER  4 (high limit alarm)   Set to 1  to use the O2 Sensor on =
the EC3 instead of one connected to the EM3.  Set to 0 if using the EM3 =
O2 sensor.
> also
> CHANNEL 14           MISCELLANEOUS
> OPTIONS AFFECTED       BSFC of engine at 14.7 A/F mixture            =
(P. 0)
>             1%  of maximum engine power                   (P. 1)
>             Fuel Pressure Sensor type                       (P. 2)
>             Mixture Monitor sensitivity                   (P. 3)
>=20
> PARAMETER  0 (sensor offset)    Brake Fuel Specific Consumption in =
Lb/HP/Hr.  .55 is typical Rotary engine value at a median mixture.  If =
you think your engine is more efficient than this, reduce this value. It =
will affect the displayed  HP and percentage of engine power on the EM3. =
 The very best engines have about .47 BSFC.
>=20
> PARAMETER  1 (zero offset)   1% of max engine power.  For example,  if =
your engine makes 250 HP max, set this to 2.50.
>=20
> PARAMETER 2 (sensor offset)   Fuel Pressure Sensor used.  Set to 0 if =
using Stewart Warner 33 - 240 ohm sender.  Set to 1 if using VDO 10 - =
180 ohm sender.
>=20
> PARAMETER 3 (mixture monitor sensitivity)  Lowering this value makes =
the mixture monitor more sensitive.   Used to compensate for differences =
in O2 sensor sensitivity.   Adjust so that stoichiometric mixture (14.7 =
: 1  A/F ratio) reads 1/2 scale on bargraph.
>=20
> Because the wideband O2 signal is inverted from the narrowband, you'd =
probably need to insert an inverting opamp if using the O2/Mixture input =
on the EM3.
>=20
> Finn
>=20
> On 2/17/2022 4:49 PM, Stephen Izett stephen.izett@gmail.com wrote:
>> Thanks Finn for the feedback.
>>=20
>> Yes, I think even with the 8 table configuration I see areas in the =
map where its hard to get it right.
>> I=E2=80=99m installing a better camera mount today so I can record =
the EM3 MCT display and Wideband on the Dynon so I can do some more post =
flight tuning of those areas hard to pickup in flight.
>> I wish I could adjust the code of the EM3 and change the O2 to =
Wideband instead of narrow.
>>=20
>> Cheers
>>=20
>> Steve
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>> On 18 Feb 2022, at 12:10 am, Finn Lassen finn.lassen@verizon.net =
<flyrotary@lancaironline.net> wrote:
>>>=20
>>> You're still way ahead of me.
>>>=20
>>> I thought I had auto-tuned all tables. Yet found it going lean when =
added throttle to climb around 4,200+ RPM. Disconcerting. Could be =
change in AOA influences intake. Need to fly and tune more. Only 33 =
hours in the air so far. And yet now have to do annual condition =
inspection :(
>>> About 3 shots of prime in 80F + temps. More in colder temps.
>>>=20
>>> Finn
>>>=20
>>>=20
>>> On 2/17/2022 3:42 AM, Stephen Izett stephen.izett@gmail.com wrote:
>>>> Hi Guys
>>>>=20
>>>> I=E2=80=99m using an EC2 with an 8 table MCT
>>>>=20
>>>> Ive never adjusted the early table entries that only get used =
during those initial moments at startup.
>>>> Our Renesis 4 port, at startup initially runs just below 1500 rpm =
and over the next ~ 30 seconds warms and then idles at our desired 1800 =
rpm. The RD1C can make some noise if we lower that idle.
>>>>=20
>>>> As its pretty tricky to get mixture readings as the engine first =
fires up, I=E2=80=99m wondering if anyone has experimented with playing =
with those early addresses of the MCT and found this has made for a =
sweeter startup.
>>>>=20
>>>> Also on startup I have settled into giving 4-5 priming shots when =
the engine is cold. And only a few when warm. It takes double or triple =
the revolutions to start when warmed up.
>>>>=20
>>>> Our OAT is generally somewhere between 60-85F
>>>>=20
>>>> I=E2=80=99m wondering what others with similar warmer climbs have =
found is the best technique.
>>>>=20
>>>> Thanks
>>>>=20
>>>> Steve Izett
>>>> Perth Western Australia
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>>=20
>>>> --
>>>> Homepage:  http://www.flyrotary.com/
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http://mail.lancaironline.net:81/lists/flyrotary/List.html
>>>>=20
>>>=20
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>=20
>=20
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