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To: lml
Date: Tue, 25 Jul 2006 11:16:15 -0400
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 receiver=logan.com; client-ip=205.188.144.207; envelope-from=MikeEasley@aol.com
From: MikeEasley@aol.com
Subject: Re: [LML] Re: Lycoming oil coolers
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Ron,
 
Niagara Thermal makes the OEM coolers that come on the TCM engines.   The 
IO-550N uses a different model than just about every other TCM big block  engine. 
 TCM has used (in the engine mounted style cooler) the #654580  cooler on 
IO-520s and TSIO-520s and other IO-550s, going back some thirty  years.  The 
Niagara Thermal web site makes mention that they do work for  TCM but they don't 
list any specific part numbers.
 
The cooler on the IO-550N is the #654585, same core, but different  
vernatherm and routing of the oil.  Some IO-550N ES pilots have had high  oil temps 
compared to some of the builders who've been flying for a few years  with the 
IO-550G, which came with the #654580 cooler.
 
To keep this short, the #654585 cooler doesn't seem to work as well as the  
older design #654580 cooler.
 
Positec has a direct replacement for the #654585 and #654580 coolers.
 
Aero Classics has one for the #654580 and is in final PMA approval for  their 
#654585 design.
 
Since we're experimental, we don't have to use the exact replacement, we  can 
switch designs if we want to.
 
Of course none of this applies to a Lycoming installation!
 
Mike Easley
Colorado Springs

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<DIV>Ron,</DIV>
<DIV>&nbsp;</DIV>
<DIV>Niagara Thermal makes the OEM coolers that come on the TCM engines.&nbs=
p;=20
The IO-550N uses a different model than just about every other TCM big block=
=20
engine.&nbsp; TCM has used (in the engine mounted style cooler) the #654580=20
cooler on IO-520s and TSIO-520s and other IO-550s, going back some thirty=20
years.&nbsp; The Niagara Thermal web site makes mention that they do work fo=
r=20
TCM but they don't list any specific part numbers.</DIV>
<DIV>&nbsp;</DIV>
<DIV>The cooler on the IO-550N is the #654585, same core, but different=20
vernatherm and routing of the oil.&nbsp; Some IO-550N ES pilots have had hig=
h=20
oil temps compared to some of the builders who've been flying for a few year=
s=20
with the IO-550G, which came with the #654580 cooler.</DIV>
<DIV>&nbsp;</DIV>
<DIV>To keep this short, the #654585 cooler doesn't seem to work as well as=20=
the=20
older design #654580 cooler.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Positec has a direct replacement for the #654585 and #654580 coolers.</=
DIV>
<DIV>&nbsp;</DIV>
<DIV>Aero Classics has one for the #654580 and is in final PMA approval for=20
their #654585 design.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Since we're experimental, we don't have to use the exact replacement, w=
e=20
can switch designs if we want to.</DIV>
<DIV>&nbsp;</DIV>
<DIV>Of course none of this applies to a Lycoming installation!</DIV>
<DIV>&nbsp;</DIV>
<DIV>Mike Easley</DIV>
<DIV>Colorado Springs</DIV></FONT></BODY></HTML>

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