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


Do you have a pressure gage or sensor on the fuel flow?

How are the spark coils being driven?

Most coils require at least a 4 ms dwell time.

The engine rotates at 7000 RPM that is 1166.66 RPS
divided into 1000 is   8.57 msec per rev.

A tall order for most control microcomputers.
The computer must calculate the exact time
before the spark is required to turn the coil on.
When the coil is shut off that's when the spark
is generated.

Very very few engines will run at 7000 RPM.
In addition rotaries fire every rev while a 4 stroke
piston engines  fires every other rev.

One of the reasons I invented a new ignition system.

What kind of control computer are you using
and does the company claim it will work with a rotary?

CD ignitions on the other hand will fire when asked
with no dwell time.

We had a fire too :-)

Paul Lamar



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