From: "steve Izett" <flyrotary@lancaironline.net>
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Subject: Tuning
Message-Id: <7CE1BFBB-708C-47C3-BC90-52837D1F398A@gmail.com>
Date: Wed, 6 Jan 2016 07:51:48 +0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Hi Guys
Could I get some feedback on process and my thinking here.
I=E2=80=99m seeking to tune in our EC2 Renesis 4 port with Elec =
adjustable prop


Steps so far (can only run for 15mins before overheating)
OAT is presently 33-40C 91-104F
Prop set course

1. EC2 Injector and Coil diagnostics all good
2. With 2 squirts she starts well after approx 2-3 revs of the starter.
3. Run her up to ~23=E2=80=9D and adjusted Injector Flow Rate - Mode #3 =
for approx Lamba of 1 on Wide Band
4. Set Idle of approx 1200RPM Adjusted Injection Dynamic Range - Mode #2 =
for same.

All OK to this point. Adjustments made in Mode #2 and #3 of EC2 reflect =
clearly on Wideband O2.
Switching between A and B computers makes no difference.

Now opening throttle up gets us to approx 5000 rpm (course Prop) but its =
missing as more power comes on and is quite severe. (Not missing now and =
then, but constant)
Selecting between A and B computers (Backup CAS) makes no difference)

THINKING=20

It has to be either fuel or spark right? (did do basic compression check =
some time back and saw fairly consistent pulses from all chambers)
   Fuel
     Fuel Pressure at rail is OK I think @ 34psi
     Injectors were cleaned and flowed.
     Good filtering in place
     Fuel - premix=20

   Spark
     4 x D585 coils with New Leads I fabricated
     Cleaned New Plugs (both T and L are 9=E2=80=99s)

How do I diagnose whats causing the missing?

Spark:
   1. Check Timing - thought this has to right mechanically on Renesis - =
How do you do this on Renesis - reference - timing wheel? - What should =
we see at say 1200RPM?
   2. Run her up in the dark to see any breakdown in ignition leads etc.
   3. Put CRO on CAS signals? (EC2=E2=80=99s do appear to have mods done =
to CAS inputs soldered to bottom side of board)
   3. Have had 2 newer plugs=20

Fuel:
   1. Rerun making careful observation of AFR and fuel rail pressure.


Other thoughts

Rerun with reduce Prop pitch - Is missing RPM or Load related?
I will seek to record (video) engine parameters next run so I can review =
actual data in case I=E2=80=99m recollecting some parameters wrongly.

=E2=80=94=E2=80=94=E2=80=94=E2=80=94=E2=80=94

Am I missing something?
Any recommendations?

Thanks
Steve Izett
Perth Western Australia