From: "Tracy Crook" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Further testing
Message-Id: <90644D11-BC51-43BE-A3B5-EFD240254CFC@gmail.com>
Date: Fri, 29 Jul 2016 21:21:23 -0600
References: <list-8833692@logan.com>
In-Reply-To: <list-8833692@logan.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Hi Steve,
  Just another possibility FWIW.

The symptom of acting different with different pitch settings of the prop do=
es not fit this possibility but most everything else does. =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

If the MAP sensor tap  changes don't help,you might try installing a 1000 Ph=
am resister IN PARALLEL with the CAS .  This could be anywhere along the pat=
h, either at the CAS or at the ec2.

There were also some internal retrofit changes I made for ec2 / Renesis user=
s.  I can't remember whether you have had them or not.=20

Tracy


Sent from my iPad

> 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 h=
eads on this.
> Last series of tests we had this major missing and noise which I think is f=
uel exploding in the exhaust.
> This happens at various RPM=E2=80=99s based on load from the adjustable pr=
op.
> With fine pitch it would spin out to just over 7000rpm before striking thi=
s 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 i=
s doing during the episodes.
>=20
> Also still having trouble with the EM3. Sometimes display reads what appea=
rs 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 d=
irectly related.
> I changed the input on the Skyview to the Standard RPM input as I incorrec=
tly fed the injector pulse to the lower voltage input, but this made no diff=
erence.
>=20
> I had wondered if the secondary injectors weren=E2=80=99t getting power an=
d 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 se=
condaries I was able to ascertain that the secondaries appear to be function=
ing 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 r=
unning 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 manifo=
ld signal tap position!
>=20
> Ed, you mentioned either small orifice or accumulator. I estimate the volu=
me of the signal line to be approx 18 cubic centimetres.
> My gut was that the accumulator required to damp the signal would need to b=
e 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 d=
amp out the pulses.
>=20
> Can I ask the group please. Who had trouble with manifold signal and what w=
as 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
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> --
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