From: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: First full power testing of Renesis 4 port
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Date: Sun, 24 Jul 2016 23:18:50 +0800
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To: Rotary motors in aircraft <flyrotary@lancaironline.net>

Thanks Ed. I=E2=80=99ll have a look at how we might buffer the signal.

Steve
> On 24 Jul 2016, at 9:57 PM, Ed Anderson <flyrotary@lancaironline.net> =
wrote:
>=20
> Hi Steve,
>=20
> Looks like the "typical" run of problems that many of us have =
encountered.
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> In my research, one thing that became clear is that there are very =
high pressure waves generated in the rotaries intake manifold (naturally =
that is what is used to "self-turbocharge" the rotary engine).  IF you =
do not have a dampener of some sort between your manifold and the EIC2 =
pressure sensors - you can get some puzzling  results.
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> I build an instrument for monitoring/control of  the Pmag electronic =
ignition systems (produced by Emags) for piston engines and some folks =
were having difficulty in that one of their Pmags would lose its TDC =
timing reference after engine start.
>=20
> It turns out it was caused by two factors.  Some folks were using the =
old magneto starting procedure whereby they would start on one Magneto =
and switch on the second magneto after engine start.  Well the Pmags =
have TDC reference set by having the user blow into their manifold =
tubes.   What was happening is the high pressure waves generated during =
the start on one Pmag generated high enough pressure in the second Pmags =
manifold line that it thought it was having its TDC reference reset (and =
by this time engine rotation had it way past TDC).  So the user was =
ending up with one Pmag with its timing 10 or more degrees off TDC.    =
Not good for smooth running.  The Emag systems folks have fixed the =
problem with a Software upgrade that precludes it from happing, but it =
just goes to show that those finite amplitude pressure waves can cause =
unanticipated problems.
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> You might try a dampener in your manifold pressure line if you do not =
already have one.  Folks have used everything from a small hole drilled =
in a rivet stuck into the line to the small fuel filters for lawnmower =
engines.
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> Ed
>=20
>=20
> Edward L. Anderson
> Anderson Electronic Enterprises LLC
> 305 Reefton Road
> Weddington, NC 28104
> http://www.andersonee.com
> http://www.eicommander.com
>=20
> -----Original Message----- From: steve Izett
> Sent: Saturday, July 23, 2016 7:29 PM
> To: Rotary motors in aircraft
> Subject: [FlyRotary] First full power testing of Renesis 4 port
>=20
> Hi Guys
>=20
> Did the first high power testing of our setup yesterday.
> Renesis 4 port EC2 RD1-C electric pitch adjustable prop on Glasair =
Super II RG
> Engine sounded good.
> On a fine pitch setting she spun out to 7200rpm.
> On a course pitch she gets just over 6000rpm.
> Our intake manifold is a modified original Renesis.
> The length is shortened, Secondaries Valve removed, but kept the =
Variable Intake Valve.
> Primary and secondary runners are different lengths now unlike the =
original setup unfortunately.
> At 6000-7000rpm opening the valve provides another 200rpm so dynamic =
charging appears to be
> working despite the primaries being shorter than the secondaries.
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> Confession time!
> Experienced a small fire from the exhaust where I had some insulation =
rap.
> Turned out I had a very small oil leak from the sump had dropped a =
small amount of Mobile#1 on the exhaust wrap which then ignited.
> Had extinguishers at the ready so no damage done. I subsequently found =
quite a few of the sump bolts were loose (poor on my part).
> Hopefully no more leaking oil. Thankful to find the problem on the =
ground while testing!
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> A few issues came up and I would appreciate your brains and wisdom:
> 1. RPM above 6000 the Dynon Skyview and the EM3 stop reading correctly =
- both take their tach input from Injector #1.
>  Now if it was just the Skyview units I=E2=80=99d look at the signal =
level. But the EM3 is also playing up and has me stuck pondering at =
present.
>  It seemed to go intermittent but and perhaps come good above 7000rpm?
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> 2. On the course pitch, as soon as the rpm gets to 6000 and I continue =
to open the throttle, it goes from smooth to massive missing and rpm =
drop.
>  Any thoughts here?
>  Related to point #1 above? Don=E2=80=99t think so as on fine pitch =
rpm doesn=E2=80=99t read properly but spins faster with no missing.
>  Don=E2=80=99t recall mixture when this happened.
>  I think its related to load?
>  What could cause this?
>  a. Fueling - I tried adjusting mixture but with no success. Thinking =
I need to experiment more with mixture when this massive missing occurs.
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> b. Spark? Coils are D585=E2=80=99s
>  c. Manifold pressure fluctuations feeding back into EC2 creating =
fueling issues?
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> Thanks in advance for your thinking on my problems.
>=20
> Steve Izett
> Perth Western Australia
> --
> Homepage:  http://www.flyrotary.com/
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>=20
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>=20
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