From: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: Further testing
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Date: Sat, 30 Jul 2016 11:27:59 +0800
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Thanks Tracy
Your "1000 Pham=E2=80=9D I take it is 1K resistor across the CAS pins.
Steve
> On 30 Jul 2016, at 11:21 AM, Tracy Crook <flyrotary@lancaironline.net> =
wrote:
>=20
> Hi Steve,
>  Just another possibility FWIW.
>=20
> The symptom of acting different with different pitch settings of the =
prop does not fit this possibility but most everything else does. =20
>=20
> Several ec2 users had similar problems when using it n the Renesis.  =
The ec2 was designed well before the Renesis came out so the sense input =
circuit is not well matched to the Renesis CAS.   Plus, there are at =
least 4 different versions of the ec2 so that complicates things as =
well. =20
>=20
> If the MAP sensor tap  changes don't help,you might try installing a =
1000 Pham resister IN PARALLEL with the CAS .  This could be anywhere =
along the path, either at the CAS or at the ec2.
>=20
> There were also some internal retrofit changes I made for ec2 / =
Renesis users.  I can't remember whether you have had them or not.=20
>=20
> Tracy
>=20
>=20
>=20
> Sent from my iPad
>=20
>> On Jul 29, 2016, at 03:19, steve Izett <flyrotary@lancaironline.net> =
wrote:
>>=20
>> Hi Guys
>>=20
>> We did further testing of the Renesis today. Would really appreciate =
your heads on this.
>> Last series of tests we had this major missing and noise which I =
think is fuel exploding in the exhaust.
>> This happens at various RPM=E2=80=99s based on load from the =
adjustable prop.
>> With fine pitch it would spin out to just over 7000rpm before =
striking this mayhem.
>> With medium pitch it would get to 6000rpm before the same symptoms.
>> =46rom memory these were both at about 22-23 inches of Hg.
>> My Wideband O2 is malfunctioning at present.=20
>> The narrowband response time appears to slow to discover what the =
mixture is doing during the episodes.
>>=20
>> Also still having trouble with the EM3. Sometimes display reads what =
appears to be an error message and at other times stops reading RPM.
>> The Skyview Engine monitor has the same issue at the same RPM so =
appears directly related.
>> I changed the input on the Skyview to the Standard RPM input as I =
incorrectly fed the injector pulse to the lower voltage input, but this =
made no difference.
>>=20
>> I had wondered if the secondary injectors weren=E2=80=99t getting =
power and as a consequence when it staged to all 4 injectors the trouble =
began.
>> Using the EM3 display (staging asterisk) and switching power off to =
the secondaries I was able to ascertain that the secondaries appear to =
be functioning fine.
>> I did notice that the point of staging appears to be not solid.
>> This takes me back to Ed=E2=80=99s comments re damping the manifold =
signal to the EC2.
>> Sorry Ed, you might have had it right last week. I thought because it =
was running so smoothly up to 23 inches that it wasn=E2=80=99t a signal =
issue.
>> Maybe the wavelength/timing of those pulses at ~6000rpm matches the =
manifold signal tap position!
>>=20
>> Ed, you mentioned either small orifice or accumulator. I estimate the =
volume of the signal line to be approx 18 cubic centimetres.
>> My gut was that the accumulator required to damp the signal would =
need to be an order of magnitude larger. (total guess)
>> So maybe 180 cc=E2=80=99s but thats half a Coke can! Seem=E2=80=99s =
way to big.
>> Ed, did I understand you right that a small fuel filter can do the =
trick? I thought they would only be about 10 cc=E2=80=99s in volume.
>> I suppose if the pulses are very narrow/short maybe thats all to =
takes to damp out the pulses.
>>=20
>> Can I ask the group please. Who had trouble with manifold signal and =
what was the solution that worked best.
>> Paul Lamar advocates tapping the signal from the oil injection ports. =
Has/is anyone using this solution?
>>=20
>> Thanks very much everyone.
>>=20
>> Steve Izett
>> Glasair Super II RG
>> Reneis 4 port EC2 EM3 RD1-C
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>> --
>> Homepage:  http://www.flyrotary.com/
>> Archive and UnSub:   =
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>=20
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