Received-SPF: pass
 receiver=logan.com; client-ip=209.85.216.44; envelope-from=wdleonard@gmail.com
MIME-Version: 1.0
In-Reply-To: <list-6824378@logan.com>
References: <list-6824378@logan.com>
Date: Mon, 14 Apr 2014 08:45:35 -0700
Message-ID: <CAOFHbnqhqSCA8Perq+-V2ETERomwUREMQMrCmCHyrRqbrUz+5Q@mail.gmail.com>
Subject: Re: [FlyRotary] Switcheroo from turbo to not
From: David Leonard <wdleonard@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Content-Type: multipart/alternative; boundary=001a11c117a802057c04f70293c7

--001a11c117a802057c04f70293c7
Content-Type: text/plain; charset=UTF-8

If you want to return to the tubo, consider a water cooled housing like the
stock.  Mine is a modified stock housing with a TO4 turbine but still
retains the water cooling.  If I am not careful with EGTs I can still melt
the turbine blades, but the housing has held up very well.  I also use the
stock heat shields.

Nothing like having the extra power!

David Leonard


On Fri, Apr 11, 2014 at 2:51 PM, <shipchief@aol.com> wrote:

> I went out to the Hangar last Tuesday to start installing the intercooler.
> Well, at least to fit a few tubes and hoses, then hold up some parts and
> make plans.
> As I took the air discharge tube off the compressor, I noticed the whole
> turbo compressor & bearing assembly wiggling around on the turbine housing!
> I checked all the mounting bolts and clips, everything was tight.
> So I took the turbo off the engine, and realized that I probably cooked
> the turbine housing. I did see EGT excursions to 1800F. What's worse, I had
> a new turbo blanket. I think a heat shield would have been better, so some
> cooling air could pass over the housing, but still block radiant heat.
> Bummer.
> So I decided to go with Plan B: I ordered the bits and tube bends to
> switch to naturally aspirated operation. I'm keeping the exhaust header
> that the turbo sat upon, and replacing everything else past the bottom of
> the firewall, to the new pipe & muffler I recently added.
> I'm retaining the ability to 'Go Turbo' later, but I've become curious
> about what the turbo must boost to equal full throttle of 'Naturally
> Aspirated'.
> I did build and have been running a tuned intake manifold. The exhaust
> won't be a tuned header, but it is pretty good, possibly better than the
> stock exhaust reactor and a whole lot lighter. It has port discharge
> nozzles (reversion cones) EGT probes and a gentle sweeping shape. Plus it's
> proven strong while carrying the weight of the turbo beyond 1800F, and it
> passed inspection. I trust it.
> So I hope to run it, find the performance satisfactory, the fuel
> consumption significantly reduced, and use 87 octane ethanol free mogas
> instead of 92. (low compression rotors)
> Also, I can advance the timing to the NA spec.
> Anyone see a problem or have advise?
>

--001a11c117a802057c04f70293c7
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">If you want to return to the tubo, consider a water cooled=
 housing like the stock. =C2=A0Mine is a modified stock housing with a TO4 =
turbine but still retains the water cooling. =C2=A0If I am not careful with=
 EGTs I can still melt the turbine blades, but the housing has held up very=
 well. =C2=A0I also use the stock heat shields.<div>
<br></div><div>Nothing like having the extra power!</div><div><br></div><di=
v>David Leonard<br><div><br></div><div><br></div></div></div><div class=3D"=
gmail_extra"><br><br><div class=3D"gmail_quote">On Fri, Apr 11, 2014 at 2:5=
1 PM,  <span dir=3D"ltr">&lt;<a href=3D"mailto:shipchief@aol.com" target=3D=
"_blank">shipchief@aol.com</a>&gt;</span> wrote:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><font color=3D"black" face=3D"arial">
<div><font style=3D"background-color:transparent">I went out to the Hangar =
last Tuesday to start installing the intercooler. Well, at least to fit a f=
ew tubes and hoses, then hold up some parts and make plans.</font></div>


<div>As I took the air discharge tube off the compressor, I noticed the who=
le turbo compressor &amp; bearing assembly wiggling around on the turbine h=
ousing!</div>

<div>I checked all the mounting bolts and clips, everything was tight. </di=
v>

<div>So I took the turbo off the engine, and realized that I probably cooke=
d the turbine housing. I did see EGT excursions to 1800F. What&#39;s worse,=
 I had a new turbo blanket. I think a heat shield would have been better, s=
o some cooling air could pass over the housing, but still=C2=A0block radian=
t heat.</div>


<div>Bummer. </div>

<div>So I decided to go with Plan B: I ordered the bits and tube bends to s=
witch to naturally aspirated operation. I&#39;m keeping the exhaust header =
that the turbo sat upon, and replacing everything else=C2=A0past the bottom=
 of the firewall, to the new pipe &amp; muffler I recently added.</div>


<div>I&#39;m retaining the ability to &#39;Go Turbo&#39; later, but I&#39;v=
e become curious about what the turbo must boost to equal full throttle of =
&#39;Naturally Aspirated&#39;.</div>

<div>I did build and have been running a tuned intake manifold. The exhaust=
 won&#39;t be a tuned header, but it is pretty good, possibly better than t=
he stock exhaust reactor and a whole lot lighter. It has port discharge noz=
zles (reversion cones) EGT probes and a gentle sweeping shape. Plus it&#39;=
s proven strong while carrying the weight of the turbo beyond 1800F, and it=
 passed inspection. I trust it.</div>


<div>So I hope to run it, find the performance satisfactory, the fuel consu=
mption significantly reduced, and use 87 octane ethanol free mogas instead =
of 92. (low compression rotors)</div>

<div>Also, I can=C2=A0advance the timing to the NA spec. =C2=A0</div>

<div>Anyone see a problem or have=C2=A0advise?</div>
</font></blockquote></div><br></div>

--001a11c117a802057c04f70293c7--