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To: flyrotary@lancaironline.net
Subject: Switcheroo from turbo to not
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Date: Fri, 11 Apr 2014 17:51:38 -0400 (EDT)

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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 ma=
ke plans.
As I took the air discharge tube off the compressor, I noticed the whole tu=
rbo compressor & bearing assembly wiggling around on the turbine housing!
I checked all the mounting bolts and clips, everything was tight.=20
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 co=
oling air could pass over the housing, but still block radiant heat.
Bummer.=20
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 firewa=
ll, to the new pipe & muffler I recently added.
I'm retaining the ability to 'Go Turbo' later, but I've become curious abou=
t 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 (rev=
ersion cones) EGT probes and a gentle sweeping shape. Plus it's proven stro=
ng while carrying the weight of the turbo beyond 1800F, and it passed inspe=
ction. I trust it.
So I hope to run it, find the performance satisfactory, the fuel consumptio=
n 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. =20
Anyone see a problem or have advise?

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<font color=3D'black' size=3D'2' face=3D'arial'>
<div><font style=3D"background-color: transparent;">I went out to the Hanga=
r 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.</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's worse, I h=
ad a new turbo blanket. I think a heat shield would have been better, so so=
me cooling air could pass over the housing, but still&nbsp;block radiant he=
at.</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'm keeping the exhaust header that=
 the turbo sat upon, and replacing everything else&nbsp;past the bottom of =
the firewall, to the new pipe &amp; muffler I recently added.</div>

<div>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 Aspir=
ated'.</div>

<div>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 s=
tock 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.</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&nbsp;advance the timing to the NA spec. &nbsp;</div>

<div>Anyone see a problem or have&nbsp;advise?</div>
</font>
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