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Subject: Re: [LML] Need advice on improving cooling
From: Don Karich <donkarich@gmail.com>
X-Original-To: Lancair Mailing List <lml@lancaironline.net>
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I'd try measuring the differential pressure on both sides of the oil cooler
and  see if you have good flow throught the cooler. I'd also check the
vernitherm and see if the oil is circulating at the correct temperature. You
can also add  a second oil cooler if necessary.

On Sat, Jan 29, 2011 at 8:36 PM, Bryan Wullner <vonjet@gmail.com> wrote:

> 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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I&#39;d try measuring the differential pressure on both sides of the oil co=
oler and=A0 see if you have good flow throught the cooler. I&#39;d also che=
ck the vernitherm and see if the oil is circulating at the correct temperat=
ure. You can also add=A0 a second oil cooler if necessary. <br>
<br>
<div class=3D"gmail_quote">On Sat, Jan 29, 2011 at 8:36 PM, Bryan Wullner <=
span dir=3D"ltr">&lt;<a href=3D"mailto:vonjet@gmail.com">vonjet@gmail.com</=
a>&gt;</span> wrote:<br>
<blockquote style=3D"BORDER-LEFT: #ccc 1px solid; MARGIN: 0px 0px 0px 0.8ex=
; PADDING-LEFT: 1ex" class=3D"gmail_quote">
<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 cl=
ose to the exhaust as well. Not sure if this is my case. All my baffles are=
 in place and properly 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></blockquote></div><br>

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