From: "Stephen Izett stephen.izett@gmail.com" <flyrotary@lancaironline.net>
Received-SPF: pass
 receiver=logan.com; client-ip=209.85.215.174; envelope-from=stephen.izett@gmail.com
Content-Type: text/plain;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable
Mime-Version: 1.0 (Mac OS X Mail 12.4 \(3445.104.11\))
Subject: Re: [FlyRotary] My EMI journey continues.
Date: Sat, 25 Jan 2020 20:05:02 +0800
References: <list-13408430@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
In-Reply-To: <list-13408430@logan.com>
Message-Id: <0D00B96A-21AB-40D6-BA43-187AAA665DFF@gmail.com>

Hi people.

An update on the EMI issue with the Glasair

I woke up to the engine cut problem over 5000rpm. Obvious when I think =
about it now.
 Its happens at staging.
When the secondaries switch on it dies, because there is no power to the =
secondary injectors.
I have some connectors in circuit so I could add Tracy=E2=80=99s =
injector failure switching.
The 14v feed to the secondary injectors had gone open.
Touching the connector made the symptom go away with full rpm/load =
available.

So the processor A stumble on radio TX is solved by the 100nF cap =
decoupling the MAP output.
And the engine cut was another problem all together. I will remove the =
faulty utilux connector.

Cheers

Steve Izett


> On 21 Jan 2020, at 12:44 pm, Stephen Izett stephen.izett@gmail.com =
<flyrotary@lancaironline.net> wrote:
>=20
> Hi Guys
>=20
> I got a few hours on the Glasair this morning.
>=20
> Last week after soldering 100nF caps across pin 1&2 of EC2, I =
couldn=E2=80=99t start the engine on either controller.???!!!
>=20
> I checked the EC2 today and found the Earth Stud on the case was a =
little loose, so I tightened it up.
>=20
> Engine then started fine and ran on both controllers. One small step =
for man=E2=80=A6..
> On Radio tx, NO stumble on either controller! Another small step for =
man=E2=80=A6.
>=20
> BUT on running up the engine ONE great big step backwards=E2=80=A6..
>=20
> Slowly increasing the RPM yields a very consistent engine cutout at =
just over 5000 rpm on both controllers.
> At say 3000 and stabbing the throttle yields the same result.
> If I pull the throttle quickly when it cuts out, it sometimes would =
recover. Otherwise it stalled completely.
>=20
> I can help but feel the caps are the culprit.
> Didn't have time to pull the EC2 and test.
> I would like to remove 100nF and retest.
> Then I=E2=80=99m tempted to replace with 10nF and retest.
>=20
> OR I could just remove the caps and put some Ferrites on the leads =
going into the EC2.
>=20
> The RF getting into the ADHARS has, it appears been attenuated =
significantly by 2 ferrites on the cables entering the unit and the =
subsequent reduction in VS indicated on radio tx.
>=20
> Till next time=E2=80=A6..
>=20
> Steve Izett
>=20
>=20
>=20
>=20
>=20
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:   =
http://mail.lancaironline.net:81/lists/flyrotary/List.html