From: "Finn Lassen finn.lassen@verizon.net" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: My EMI journey continues.
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Date: Sat, 25 Jan 2020 10:20:11 -0500
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"So the processor A stumble on radio TX is solved by the 100nF cap 
decoupling the MAP output."

But why???

Those MAP sensors are inside the metal box on the EC circuit board. How 
would EMI possibly get in there?

Finn

On 1/25/2020 7:05 AM, Stephen Izett stephen.izett@gmail.com wrote:
> 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’s 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:
>>
>> Hi Guys
>>
>> I got a few hours on the Glasair this morning.
>>
>> Last week after soldering 100nF caps across pin 1&2 of EC2, I couldn’t start the engine on either controller.???!!!
>>
>> I checked the EC2 today and found the Earth Stud on the case was a little loose, so I tightened it up.
>>
>> Engine then started fine and ran on both controllers. One small step for man…..
>> On Radio tx, NO stumble on either controller! Another small step for man….
>>
>> BUT on running up the engine ONE great big step backwards…..
>>
>> 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.
>>
>> 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’m tempted to replace with 10nF and retest.
>>
>> OR I could just remove the caps and put some Ferrites on the leads going into the EC2.
>>
>> 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.
>>
>> Till next time…..
>>
>> Steve Izett
>>
>>
>>
>>
>>
>> --
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>
> --
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