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Date: Mon, 14 Dec 2009 10:59:45 -0600
Message-ID: <5cf132c0912140859h756e58ads295483d44034c2a@mail.gmail.com>
Subject: Oil Cooling
From: Mark Steitle <msteitle@gmail.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
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Well guys, here is a new one... at least for me.

I've never been able to get my 20B oil temps quite low enough for comfort.
I chaulked most of it up to the high Texas temps and an engine that produces
gobs of horsepower (just kidding on the "gobs of horsepower" part).  I'm
running a 10" x 11" x 2 3/4" Fluidyne dual-pass oil/air cooler and a large
(and heavy) Fluidyne oil/water exchanger.  Water temps were fine but the oil
temps would reach 240*-245* on climb, and just barely down to 200* in
cruise.  I tried different plumbing arrangements, added a cowl flap (which
helped some), etc.  Still, the temps didn't want to come down.  Well,
yesterday I ran the engine with the cowl off (doing some fuel
pressure monitoring/adjusting), and I had just finished getting things up
to operating temperature, verified that fuel pressure was good, and then
shut it down.  I just happened to touch the end tank on the Fluidyne oil/air
exchanger and to my surprise, IT WAS STONE COLD!  I touched the other end
(inlet/outlet) and it was HOT!  I thought this was odd.  The only thing that
I could figure is that the dual-pass oil cooler was defective.  Since the
cooler has no thermostat, I can only conclude that the internal tank
separator, which is how they make a single-pass cooler into a dual-pass
cooler, was allowing the oil to bypass the core and go directly from the
inlet to the outlet.  Well, no wonder I can't get the oil temps to come
down!!!

I replaced the cooler with another unit I had on hand, ran the engine,
and low and behold, both end tanks come up to temp together.  I did a couple
of ground runs and themps look encouraging.  But unfortunately, it was too
late to do a test flight yesterday.  I'm sure the new cooler will make a big
improvement. I'm hoping it will be enough to permit me to remove the
oil/water exchanger.

Moral of the story... DON'T TAKE ANYTHING FOR GRANTED!  TRUST BUT VERIFY!!!

Mark S.
Lancair ES/20B

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<div>Well guys, here is a new one... at least for me.=A0 </div>
<div>=A0</div>
<div>I&#39;ve never been able to get my 20B=A0oil temps quite low enough=A0=
for comfort.=A0 I=A0chaulked=A0most=A0of it up to the high Texas temps and =
an engine that produces gobs of horsepower (just kidding on the &quot;gobs =
of horsepower&quot; part).=A0=A0I&#39;m running a 10&quot; x 11&quot; x 2 3=
/4&quot;=A0Fluidyne dual-pass oil/air cooler and a large (and heavy)=A0Flui=
dyne oil/water exchanger.=A0 Water temps were fine but=A0the oil temps woul=
d reach 240*-245* on climb, and just barely down to 200* in cruise.=A0 I tr=
ied different plumbing arrangements, added a cowl flap (which helped some),=
 etc.=A0 Still, the temps didn&#39;t want to come down.=A0=A0Well, yesterda=
y=A0I ran the engine with the cowl off (doing some fuel pressure=A0monitori=
ng/adjusting), and I had just finished getting things up to=A0operating tem=
perature, verified that fuel pressure was good,=A0and then shut it down.=A0=
 I=A0just happened to touch the end tank on the Fluidyne=A0oil/air exchange=
r and to my surprise, IT WAS STONE COLD!=A0 I touched the other end (inlet/=
outlet) and it was=A0HOT!=A0=A0I thought this was=A0odd.=A0 The only thing =
that I could figure is that the dual-pass oil cooler was defective.=A0 Sinc=
e the cooler has no thermostat, I can only conclude that the internal tank =
separator, which is=A0how they make=A0a single-pass cooler=A0into a dual-pa=
ss cooler,=A0was=A0allowing the oil to=A0bypass the core and=A0go directly =
from=A0the inlet to the outlet.=A0 Well, no wonder I can&#39;t get the=A0oi=
l temps to come down!!!=A0=A0</div>

<div>=A0</div>
<div>I replaced the cooler with another unit=A0I had on hand, ran the engin=
e, and=A0low and behold, both end tanks=A0come up to temp=A0together.=A0 I =
did a couple of ground runs and themps look encouraging.=A0=A0But unfortuna=
tely,=A0it was too late to=A0do a test flight yesterday.=A0 I&#39;m sure th=
e new cooler=A0will=A0make a big improvement.=A0I&#39;m hoping=A0it will be=
 enough to permit me to remove the oil/water exchanger.=A0=A0</div>

<div>=A0</div>
<div>Moral of the story... DON&#39;T TAKE ANYTHING FOR GRANTED!=A0 TRUST BU=
T VERIFY!!!</div>
<div>=A0</div>
<div>Mark S.</div>
<div>Lancair ES/20B</div>
<div>=A0</div>
<div>=A0=A0=A0=A0=A0=A0</div>

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