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Date: Sun, 28 Aug 2011 21:24:22 -0700
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Subject: How to tune with ADI?
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Ok,  So I have the new ADI system installed and working....  I think?

Some of you smart racing guys probably have experience with ADI.

Most of the instructions that come with tuning it are directed toward car
guys that have computers and knock sensors.  All they do is turn the system
on and the computer allows more advance because I is not sensing any knock.
The only real advise I have so for for me is that I should be running just
less than the amount of ADI that it takes to bog down the engine.  My system
is a fixed flow so I don't have much choice but it seems to be about right.
If I use straight water (which I did for initial testing), the engine bogs
after about 10-15 seconds of ruining the ADI system.  But when I uses a
50/50 mix of water and denatured alcohol (too hard to find methanol around
here, but close enough) the engine does not bog.

So assuming my amount of ADI injected is about right, now I am supposed to
be able to lean to better power and advance the timing a little.  But how
much?  For the last testing flight I was using EGT for lack of a better
guide.  When the ADI comes on, my EGT drops by about 30 deg C, and there is
a hint of roughness to the engine.  I can then lean a little and the
roughness clears up.  For my test flight I leaned until my EFT came back up
to where I normally limit it (890 deg C).  But if I then add 5 more inches
of MAP, there is still a hint of roughness even at 890 deg and I get the
sense that it wants to be leaned a little more. But I am afraid to do
that...  We are talking 45" MAP and 7300 RPM here (185 KTS indicated
(Vne) and climbing at 500 fpm).

So here are my questions:
Is EGT a useful tool here, and does leaning to get the EGT back to 890 make
any sense?
Since Methanol will do such a good job at preventing detonation, is it safe
to lean further toward best power (peak EGT)? (note, that will be hard on
the turbo...  I need to remember to bring the spare one to Reno)
How much advance do you think i can add?  I was previously ruining 5 deg
ahead of Tracy's recommended initial set up.  Can't give a number because
the EC2 retards the timing with higher MAP's.  How much, I have not heard.
I can easily add one deg at a time using Ed's EFI monitor.  But without a
knock sensor am really in the blind.

Thoughts?

-- 
David Leonard

Turbo Rotary RV-6 N4VY
http://N4VY.RotaryRoster.net
http://RotaryRoster.net

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<div>Ok,=A0 So I have the new ADI system installed and working....=A0 I thi=
nk?</div>
<div>=A0</div>
<div>Some of you smart racing guys probably have experience with ADI.</div>
<div>=A0</div>
<div>Most of the instructions that come with tuning it are directed toward =
car guys that have computers and knock sensors.=A0 All they do is turn the =
system on and the computer allows more advance because I is not sensing any=
 knock.=A0 The only real advise I have so for for me is that I should be ru=
nning just less than the amount of ADI that it takes to bog down the engine=
.=A0 My system is a fixed flow so I don&#39;t have much choice but it seems=
 to be about right.=A0 If I use straight water (which I did for initial tes=
ting), the engine bogs after about 10-15 seconds of ruining the ADI system.=
=A0 But when I uses a 50/50 mix of water and denatured alcohol (too hard to=
 find methanol around here, but close enough) the engine does not bog.</div=
>

<div>=A0</div>
<div>So assuming my amount of ADI injected is about right, now I am suppose=
d to be able to lean to better power and advance the timing a little.=A0 Bu=
t how much?=A0 For the last testing flight I was using EGT for lack of a be=
tter guide.=A0 When the ADI comes on, my EGT drops by about 30 deg C, and t=
here is a hint of roughness to the engine.=A0 I can then lean a little and =
the roughness clears up.=A0 For my test flight I leaned until my EFT came b=
ack up to where I normally limit it (890 deg C).=A0 But if I then add 5 mor=
e inches of MAP, there is still a hint of roughness even at 890 deg and I g=
et the sense that it wants to be leaned a little more. But I am afraid to d=
o that...=A0 We are talking 45&quot; MAP and 7300 RPM here (185 KTS indicat=
ed (Vne)=A0and climbing at 500 fpm).=A0 </div>

<div>=A0</div>
<div>So here are my questions:</div>
<div>Is EGT a useful tool here, and does leaning to get the EGT back to 890=
 make any sense?</div>
<div>Since Methanol will do such a good job at preventing detonation, is it=
 safe to lean further toward best power (peak EGT)? (note, that will be har=
d on the turbo...=A0 I need to remember to=A0bring the spare one to Reno)</=
div>

<div>How much advance do you think i can add?=A0 I=A0was previously=A0ruini=
ng 5 deg ahead of Tracy&#39;s recommended initial set up.=A0 Can&#39;t give=
 a number=A0because the EC2 retards the timing with higher MAP&#39;s.=A0 Ho=
w much, I have not heard.=A0 I can easily add one deg at a time using Ed=
9;s EFI monitor.=A0 But without a knock sensor am really in the blind.</div=
>

<div>=A0</div>
<div>Thoughts?=A0 <br clear=3D"all"><br>-- <br>David Leonard<br><br>Turbo R=
otary RV-6 N4VY<br><a href=3D"http://N4VY.RotaryRoster.net">http://N4VY.Rot=
aryRoster.net</a><br><a href=3D"http://RotaryRoster.net">http://RotaryRoste=
r.net</a><br>
</div>

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