From: "Ed Anderson" <flyrotary@lancaironline.net>
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To: "Rotary motors in aircraft" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] First full power testing of Renesis 4 port
Date: Sun, 24 Jul 2016 09:57:22 -0400
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Hi Steve,

Looks like the "typical" run of problems that many of us have encountered.

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.

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.

  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.

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.

Ed


Edward L. Anderson
Anderson Electronic Enterprises LLC
305 Reefton Road
Weddington, NC 28104
http://www.andersonee.com
http://www.eicommander.com

-----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

Hi Guys

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.

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!

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 Iâ€™d 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?

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? Donâ€™t think so as on fine pitch rpm doesnâ€™t 
read properly but spins faster with no missing.
   Donâ€™t 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.

b. Spark? Coils are D585â€™s
   c. Manifold pressure fluctuations feeding back into EC2 creating fueling 
issues?

Thanks in advance for your thinking on my problems.

Steve Izett
Perth Western Australia
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