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To: "Stephen Izett" <flyrotary@lancaironline.net>
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Subject: Re: [FlyRotary] Re: First full power testing of Renesis 4 port
Date: Mon, 25 Jul 2016 09:33:34 -0500
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Steve, Could you post some pictures of your shortened intake system?  I'm 
doing the same thing.  Also how did you set up your fuel injectors?
my email:  lucky9020@gmail.com  Thanks, Gary   Waupun, Wisconsin USA

-----Original Message----- 
From: Stephen Izett
Sent: Sunday, July 24, 2016 10:18 AM Subject: Re: [FlyRotary] Re: First full 
power testing of Renesis 4 port

Thanks Ed. I’ll 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:
>
> 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 I’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? Don’t think so as on fine pitch rpm doesn’t 
> read properly but spins faster with no missing.
>  Don’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 D585’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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