REFLECTOR:High Temps on taxi

jack davis reflector@tvbf.org
Sat, 17 Jan 2004 12:32:53 -0500


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Mike,

I have an automobile after-market cooling fan installed in the bottom of =
my cowl (I have the top NACA scoops for cooling).  I only use the fan on =
hot days while taxiing or waiting on the ground.  It works extremely =
well in keeping the CHTs in the 320 - 350 degree range.  I once had to =
hold on the ground for 25 minutes when the ambient temperature was 96 =
degrees and the CHTs never got above 380 degrees.

It seems, at first, that the fan wouldn't work because of the large =
opening at the cowl exit, but the prop must provide enough pull to keep =
the fan effective.  The fan that I have doesn't weigh very much.  You =
can get them at any auto store or through the JC Whitney catalog.

Jack
  ----- Original Message -----=20
  From: MikeWatsonSpg@cs.com=20
  To: reflector@tvbf.org=20
  Sent: Tuesday, January 13, 2004 6:42 PM
  Subject: REFLECTOR:High Temps on taxi


  OK, from analyzing the answers so far, the cure for high temps on taxi =
and hold
  is to:

  1} Male sure the plenum is tight around the cylinders.   DONE
  2} Lean like hell while idling.  ALWAYS DO.
  3} use bilge fan to cool oil.        HAVEN'T DONE THAT YET
  4} Make sure cowl is as close to prop as possible.  DONE
  5} make slots on lower cowl for air to exit.

  Scott Swing already tried # 5 with minimal results.

  Maybe mounting a big fan (ala Volkswagen) with the top nacca scoop=20
  will resolve the heat problem?????

  Mike W.



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<DIV><FONT face=3DArial size=3D2>Mike,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I have an automobile after-market =
cooling fan=20
installed in the bottom of my cowl (I have the top NACA scoops for=20
cooling).&nbsp; I only use the fan on hot days while taxiing or waiting =
on the=20
ground.&nbsp; It works extremely well in keeping the CHTs in the 320 - =
350=20
degree range.&nbsp; I once had to hold on the ground for 25 minutes when =
the=20
ambient temperature was 96 degrees and the CHTs never got above 380=20
degrees.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>It seems, at first, that the fan =
wouldn't work=20
because of the large opening at the cowl exit, but the prop must provide =
enough=20
pull to keep the fan effective.&nbsp; The fan that I have doesn't weigh =
very=20
much.&nbsp; You can get them at any auto store or through the JC Whitney =

catalog.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Jack</FONT></DIV>
<BLOCKQUOTE=20
style=3D"PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; =
BORDER-LEFT: #000000 2px solid; MARGIN-RIGHT: 0px">
  <DIV style=3D"FONT: 10pt arial">----- Original Message ----- </DIV>
  <DIV=20
  style=3D"BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: =
black"><B>From:</B>=20
  <A title=3DMikeWatsonSpg@cs.com=20
  href=3D"mailto:MikeWatsonSpg@cs.com">MikeWatsonSpg@cs.com</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A =
title=3Dreflector@tvbf.org=20
  href=3D"mailto:reflector@tvbf.org">reflector@tvbf.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Tuesday, January 13, 2004 =
6:42=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> REFLECTOR:High Temps =
on=20
  taxi</DIV>
  <DIV><BR></DIV><FONT face=3Darial,helvetica><FONT lang=3D0 =
face=3DArial size=3D2=20
  FAMILY=3D"SANSSERIF" PTSIZE=3D"10">OK, from analyzing the answers so =
far, the cure=20
  for high temps on taxi and hold<BR>is to:<BR><BR>1} Male sure the =
plenum is=20
  tight around the cylinders.&nbsp;&nbsp; DONE<BR>2} Lean like hell =
while=20
  idling.&nbsp; ALWAYS DO.<BR>3} use bilge fan to cool=20
  oil.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; HAVEN'T DONE THAT =
YET<BR>4}=20
  Make sure cowl is as close to prop as possible.&nbsp; DONE<BR>5} make =
slots on=20
  lower cowl for air to exit.<BR><BR>Scott Swing already tried # 5 with =
minimal=20
  results.<BR><BR>Maybe mounting a big fan (ala Volkswagen) with the top =
nacca=20
  scoop <BR>will resolve the heat problem?????<BR><BR>Mike=20
W.<BR><BR></BLOCKQUOTE></FONT></FONT></BODY></HTML>

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