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From: "Clark Baker" <bakercdb@gmail.com>
Subject: LNC2 Oil Cooling
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For several years I have been wrestling with high oil temps in my 360, a no=
t
uncommon problem.  I have an IO360, 9.0/1 pistons, plenum, a fairly
large cowl exit area, and firewall mounted oil cooler with a Positech 4215
(8 row) oil cooler fed with a 3" SCAT off the right side baffling.

In search of an "elegant" solution, I experimented with
-the shark gill louvers for exiting air (which I no longer have)
-a duct between the shark gills and oil cooler to help draw air out
-a cowl flap
-adding a 2" duct off the right side of the engine to a "Y" into the 3" duc=
t
feeding the oil cooler
-replacing the "Y" above with a separate 2" flange on the oil cooler duct
-etc

When adding the additional 2" hose feeding a 2nd flange on the  oil cooler
duct (roughly 40% more air volume) produced little improvement, I decided
that it might not be a problem with air flow.  I then decided to try the
Positech 4216 (10 row) oil cooler.  I was told by an oil cooler specialist
that while the old Positech coolers were noticeably inferior in cooling to
the S/W models, the new models (produced for at least the last couple of
years) are roughly comparable.

While I have not flow in hot summer weather yet, the larger cooler is a
marked improvement.  I flew 4 long ILS approaches in 50F weather and the oi=
l
temp had just passed 200F.  Previously, 2 ILSs would have the oil temp
approaching 240F.  The ability to tolerate longer periods of ground
operations also appears much improved.  Cruise temps are fine at 170-180F a=
t
25-50F OAT.  My CHT's are well balanced (generally less than 20F spread at
cruise) and within the conservative limits recently discussed on the LML.

While I know others are successful with the smaller oil coolers (especially
if mounted directly on the baffles or fed with a large NACA scoop), this
worked for me.

Regards,
Clark Baker
LNC2 360 (660hrs)

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<div>For several years I have been wrestling with high oil temps in my 360,=
 a not uncommon problem.&nbsp; I have an IO360, 9.0/1&nbsp;pistons,&nbsp;pl=
enum, a fairly large&nbsp;cowl exit area, and firewall mounted oil cooler w=
ith a Positech 4215 (8 row) oil cooler fed with a 3&quot; SCAT off the righ=
t side baffling.&nbsp;
</div>
<div>&nbsp;</div>
<div>In search of an &quot;elegant&quot; solution, I experimented with &nbs=
p; <br clear=3D"all">-the shark gill louvers for exiting air (which I no lo=
nger have)</div>
<div>-a duct between the shark gills and oil cooler to help draw air out</d=
iv>
<div>-a cowl flap</div>
<div>-adding a 2&quot; duct off the right side of the engine to a &quot;Y&q=
uot; into the 3&quot; duct feeding the oil cooler</div>
<div>-replacing the &quot;Y&quot; above with a separate 2&quot; flange on t=
he oil cooler duct</div>
<div>-etc</div>
<div>&nbsp;</div>
<div>When adding the additional 2&quot; hose feeding&nbsp;a 2nd flange on t=
he &nbsp;oil cooler duct (roughly 40% more air volume) produced little impr=
ovement, I decided that it might not be a problem with air flow.&nbsp; I th=
en decided to try the Positech 4216 (10 row) oil cooler.&nbsp; I was told b=
y an oil cooler specialist that while the old Positech coolers were noticea=
bly inferior in cooling to the S/W models,&nbsp;the new models (produced fo=
r at least the last couple of years) are roughly comparable.
</div>
<div>&nbsp;</div>
<div>While I have not flow in hot summer weather yet, the larger cooler is =
a marked improvement.&nbsp; I flew 4 long ILS approaches in 50F weather and=
 the oil temp had just passed 200F.&nbsp; Previously, 2 ILSs would have the=
 oil temp approaching 240F.&nbsp; The ability to tolerate longer periods of=
 ground operations also appears much improved.&nbsp; Cruise temps are fine =
at 170-180F at 25-50F OAT.&nbsp; My CHT's are well balanced (generally less=
 than 20F spread at cruise) and within the conservative limits recently dis=
cussed on the LML.
</div>
<div>&nbsp;</div>
<div>While I know others are successful with the smaller oil coolers (espec=
ially if mounted directly on the baffles or fed with a large NACA scoop), t=
his worked for me.</div>
<div>&nbsp;</div>
<div>Regards,</div>
<div>Clark Baker</div>
<div>LNC2 360 (660hrs)</div>

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