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Date: Sat, 29 Jan 2011 23:36:33 -0500
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Subject: Need advice on improving cooling
From: Bryan Wullner <vonjet@gmail.com>
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My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to cool and
I am feeding the oil cooler with air off the #3 cyl.

My chts are high on the ground and takeoff. The oil temp is high on the
ground as well. Its to the point where I can't takeoff if I'm on the ground
too long. And the hotter days aren't even here yet.

Also my carb temp climbs on the ground and pegs at the gauge limit of 127
degrees. I've replaced the probe and the manufacturer seems to think its
operating normally. This would make me believe my lower cowling area is
getting hot and not enough air flowing out of it.

My AP has checked my engine, compression, timing etc and doesn't believe
there is any issues with it. The cooler is a 9 vane SW that was new when
installed.

My plan was to add cowling louvers to the lower cowling on each side below
the cyl banks.  I would hope this would improve the air movement out the
cowling.
I read that cht probes could read high if they run close to the exhaust in a
tight cowling. Mine do. Also the carb probe is kind of close to the exhaust
as well. Not sure if this is my case. All my baffles are in place and
properly sealed.

Anybody have any advice on where to place these or other ideas that would
improve cooling or things to check

Bryan

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<p>My airplane: Lancair 360, 180hp 360 carburated. I have a plenum to cool =
and I am feeding the oil cooler with air off the #3 cyl.</p>
<p>My chts are high on the ground and takeoff. The oil temp is high on the =
ground as well. Its to the point where I can&#39;t takeoff if I&#39;m on th=
e ground too long. And the hotter days aren&#39;t even here yet.</p>
<p>Also my carb temp climbs on the ground and pegs at the gauge limit of 12=
7 degrees. I&#39;ve replaced the probe and the manufacturer seems to think =
its operating normally. This would make me believe my lower cowling area is=
 getting hot and not enough air flowing out of it.</p>

<p>My AP has checked my engine, compression, timing etc and doesn&#39;t bel=
ieve there is any issues with it. The cooler is a 9 vane SW that was new wh=
en installed.</p>
<p>My plan was to add cowling louvers to the lower cowling on each side bel=
ow the cyl banks.=A0 I would hope this would improve the air movement out t=
he cowling. <br>
I read that cht probes could read high if they run close to the exhaust in =
a tight cowling. Mine do. Also the carb probe is kind of close to the exhau=
st as well. Not sure if this is my case. All my baffles are in place and pr=
operly sealed. </p>

<p>Anybody have any advice on where to place these or other ideas that woul=
d improve cooling or things to check</p>
<p>Bryan</p>

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