From: "Andrew Martin" <flyrotary@lancaironline.net>
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Date: Thu, 4 Aug 2016 19:09:18 +0800
Message-ID: <CAJxaVD3JLvoEwAhsObnGBE-3BdD+T1AW1__8_fS-OWL6AC0j=A@mail.gmail.com>
Subject: Tuning
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Well, after another flight on the weekend looks like I may be getting oil
cooling to a point good enough for sustained flight. but found out engine
tuning can invoke a kaleidoscope of emotions.

Tracy's .1 uF cap fix on the A MAP sensor fixed RFI on the ground, engine
seemed smooth & strong so took another flight. with a really long taxi to
the threshold oil temp climbed to 200, while I was rolling noticed it
dropping so more power & take off. My exhaust is high on the forward cowl
so easily visible during flight, I could see it moving at about 1-2
pulses/sec (no other cues & probably not noticeable if exhaust not
visible), but assumed engine is missing so decided on a low level circuit
to land. radioed intentions & engine stutters!  no more RT.

This had me stuffed so decided to sleep on it for a couple of days to try
and work out why this engine is so scared of flying, and actually knows
when its left the ground.

Here's what I reckon, its a combination of an engine that runs so smooth
even when extremely out of tune, that it gives a false sense to the
operator that they know what they are doing, 60lb injectors & a variable
pitch prop.
I think the engine was just about flooding in flight, a little bit of RFI,
injectors open for just a little bit longer and it goes over the edge, no
proof but will try running really rich and keying the radio tomorrow before
I try to tune the engine.

Most of my previous tuning was with the prop at the lower half of its pitch
range as the prop manual advised against operating the prop on the ground
at coarse pitch. I think this is a big mistake as it don't fly on fine
pitch. So I'm going to start from scratch and do it all again much coarser.

To get some reference I decided to try and decode the engine info page on
the EM2. Geez that Hex to Decimal conversion is complex. anyway If I've
interpreted it right I'm stunned to find some settings way off what they
should be.

from EC2.A8 manual.
parameter, (row-column),hex,dec
Staging point,(4-3),15,21"
SECDIF,(3-5),34,52
R1DIF,(3-3),80,128
R1DIFA,(4-6),80,128
Ignadv,(4-4),00,0
Inj Flow,(3-7),6E,110

I had adjusted Inj flow with mode 3 and really thought I'd cleared mode 6
when I installed the injectors. the others I really don't know how they
ended up different from defaults.
I did suspect the R1dif as both rotors have 2 egt's, 1 for EM2 & 1 for
efis, strange thing is, EM2 shows R2 as way hotter than R1, efis is
reverse. but anyway, as manual states to leave mode 4 alone until motor is
running perfectly in every other respect, I hadn't touched it.

Tracy, when you got time, I'd really like to know what all the other
numbers relate to on the engine info screen to see if any others are in
error.

Andrew

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<div dir=3D"ltr"><div><div><div><div><div><div><div><div><div><div><div><di=
v><div><div>Well, after another flight on the weekend looks like I may be g=
etting oil cooling to a point good enough for sustained flight. but found o=
ut engine tuning can invoke a kaleidoscope of emotions.<br><br></div>Tracy&=
#39;s .1 uF cap fix on the A MAP sensor fixed RFI on the ground, engine see=
med smooth &amp; strong so took another flight. with a really long taxi to =
the threshold oil temp climbed to 200, while I was rolling noticed it dropp=
ing so more power &amp; take off. My exhaust is high on the forward cowl so=
 easily visible during flight, I could see it moving at about 1-2 pulses/se=
c (no other cues &amp; probably not noticeable if exhaust not visible), but=
 assumed engine is missing so decided on a low level circuit to land. radio=
ed intentions &amp; engine stutters!=C2=A0 no more RT.<br><br></div>This ha=
d me stuffed so decided to sleep on it for a couple of days to try and work=
 out why this engine is so scared of flying, and actually knows when its le=
ft the ground.<br><br></div>Here&#39;s what I reckon, its a combination of =
an engine that runs so smooth even when extremely out of tune, that it give=
s a false sense to the operator that they know what they are doing, 60lb in=
jectors &amp; a variable pitch prop. <br>I think the engine was just about =
flooding in flight, a little bit of RFI, injectors open for just a little b=
it longer and it goes over the edge, no proof but will try running really r=
ich and keying the radio tomorrow before I try to tune the engine.<br><br><=
/div>Most of my previous tuning was with the prop at the lower half of its =
pitch range as the prop manual advised against operating the prop on the gr=
ound at coarse pitch. I think this is a big mistake as it don&#39;t fly on =
fine pitch. So I&#39;m going to start from scratch and do it all again much=
 coarser.<br><br></div>To get some reference I decided to try and decode th=
e engine info page on the EM2. Geez that Hex to Decimal conversion is compl=
ex. anyway If I&#39;ve interpreted it right I&#39;m stunned to find some se=
ttings way off what they should be.<br><br></div><div>from EC2.A8 manual. <=
br></div><div>parameter, (row-column),hex,dec<br></div>Staging point,(4-3),=
15,21&quot;<br></div>SECDIF,(3-5),34,52<br></div>R1DIF,(3-3),80,128<br></di=
v>R1DIFA,(4-6),80,128<br></div>Ignadv,(4-4),00,0<br></div>Inj Flow,(3-7),6E=
,110<br><br></div>I had adjusted Inj flow with mode 3 and really thought I&=
#39;d cleared mode 6 when I installed the injectors. the others I really do=
n&#39;t know how they ended up different from defaults.<br></div><div>I did=
 suspect the R1dif as both rotors have 2 egt&#39;s, 1 for EM2 &amp; 1 for e=
fis, strange thing is, EM2 shows R2 as way hotter than R1, efis is reverse.=
 but anyway, as manual states to leave mode 4 alone until motor is running =
perfectly in every other respect, I hadn&#39;t touched it.<br></div><div><b=
r></div>Tracy, when you got time, I&#39;d really like to know what all the =
other numbers relate to on the engine info screen to see if any others are =
in error.<br><br></div>Andrew<br><div><div><div><div><div><div><div><div><d=
iv><div><div><div><div><br><br><div><div><div><div><div class=3D"gmail_sign=
ature" data-smartmail=3D"gmail_signature"><br><br></div></div>
</div></div></div></div></div></div></div></div></div></div></div></div></d=
iv></div></div></div></div>

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