From: "Matt Boiteau mattboiteau@gmail.com" <flyrotary@lancaironline.net>
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Date: Sat, 5 Jun 2021 10:51:39 -0400
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Subject: Re: [FlyRotary] Re: Tuning
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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High power isn't an issue with timing.

I'm trying to understand when you are on base/final and your prop is
driving the engine.

Do we treat it like coasting down hill in a car?

Under 40kpa and 4500rpm, what timing does Tracy computer use?

On Fri., Jun. 4, 2021, 09:47 Matt Boiteau mattboiteau@gmail.com, <
flyrotary@lancaironline.net> wrote:

>   Sorry I missed all the replies here.
>
> Charlie - I'm measuring both in/out of oil and coolant. Usually when I
> list the temp numbers, I try to say which one it is. Sorry about that.
>
> The P-Port Renesis engine that I have, got 2" p-ports from Paul. Which
> sounds like they are too big? I wonder how I can bring them down to 1.75"?
> Is the inlet to the engine more important, or the whole length of the
> runners to be 1.75"?
>
> I still don't have a good answer for timing tables for the Rx8. Having a
> bit trouble tuning for the low RPM's for downwind / final. I know for cars,
> you can cut the fuel and raise the timing to coast downhill. Not sure for
> airplanes, since the prop is driving the engine, how we tune for that.
> Right now I have 38degree timing for descending. I wonder if I should drop
> that down to the low 30s and not try to lean it out like a car.
>
> - Matt Boiteau
> --
> Homepage:  http://www.flyrotary.com/
> Archive and UnSub:
> http://mail.lancaironline.net:81/lists/flyrotary/List.html
>

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<div dir=3D"auto">High power isn&#39;t an issue with timing.<div dir=3D"aut=
o"><br></div><div dir=3D"auto">I&#39;m trying to understand when you are on=
 base/final and your prop is driving the engine.</div><div dir=3D"auto"><br=
></div><div dir=3D"auto">Do we treat it like coasting down hill in a car?=
=C2=A0</div><div dir=3D"auto"><br></div><div dir=3D"auto">Under 40kpa and 4=
500rpm, what timing does Tracy computer use?</div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri., Jun. 4, 2021, 09=
:47 Matt Boiteau <a href=3D"mailto:mattboiteau@gmail.com">mattboiteau@gmail=
.com</a>, &lt;<a href=3D"mailto:flyrotary@lancaironline.net">flyrotary@lanc=
aironline.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" sty=
le=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div d=
ir=3D"ltr">=C2=A0 Sorry I missed all the replies here.<div><br></div><div>C=
harlie - I&#39;m measuring=C2=A0both in/out of oil and coolant. Usually whe=
n I list the temp numbers, I try to say which one it is. Sorry about that.<=
br><br>The P-Port Renesis engine that I have, got 2&quot; p-ports from Paul=
. Which sounds like they are too big? I wonder how I can bring them down to=
 1.75&quot;? Is the inlet to the engine more important, or the whole length=
 of the runners to be 1.75&quot;?<br><br>I still don&#39;t have a good answ=
er for timing tables for the Rx8. Having a bit trouble tuning for the low R=
PM&#39;s for downwind / final. I know for cars, you can cut the fuel and ra=
ise the timing to coast downhill. Not sure for airplanes, since the prop is=
 driving the engine, how we tune for that. Right now I have 38degree timing=
 for descending. I wonder if I should drop that down to the low 30s and not=
 try to lean it out like a car.</div><div><br></div><div><div dir=3D"ltr"><=
div dir=3D"ltr"><div><div dir=3D"ltr">- Matt Boiteau</div></div></div></div=
></div></div>
--<br>
Homepage:=C2=A0 <a href=3D"http://www.flyrotary.com/" rel=3D"noreferrer nor=
eferrer" target=3D"_blank">http://www.flyrotary.com/</a><br>
Archive and UnSub:=C2=A0 =C2=A0<a href=3D"http://mail.lancaironline.net:81/=
lists/flyrotary/List.html" rel=3D"noreferrer noreferrer" target=3D"_blank">=
http://mail.lancaironline.net:81/lists/flyrotary/List.html</a><br>
</blockquote></div>

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