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burning oil?



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normal operating temp =3D thermo open temp if rad has excess cooling =
capacity AT THAT TEMP.
thermo will cycle open/closed/open/closed for quite awhile after =
starting and reaching first cycle of open.  I've seen this happen many =
times on my van.  With the engine cover off, driving around, the rad fan =
will blow cool/hot/cool/hot/cool and finally steadily warm.  The =
scenario must go like this;
start engine-thermo closed-coolant in engine warms up-thermo opens-cold =
slug of coolant enters engine, cool coolant hits thermo-thermo =
closes-cycles repeat about five times until the coolant is =
mixed/uniformly warm.
Larry
  ----- Original Message -----=20
  From: Michael Abatzis=20
  To: scirocco-l@scirocco.org=20
  Sent: Monday, February 24, 2003 9:04 PM
  Subject: Re: burning oil?


  is that true? isn't normal operating temp > the thermo opening temp? =
so when=20
  the engine's warm, the thermo isn't open all the way? my impression =
was the=20
  thermostat is either open or closed...


  -Michael Abatzis
  Hotlanta! GA
  1988 Scirocco 2L 16v RIP-->parting, finally taking orders:=20
  www.learnlink.emory.edu/~mabatzi/mikes_page1.html
  1987 Scirocco 2L 16v...




  >From: Andrew Basterfield <list@cemetery.homeunix.org>
  >To: "Michael Abatzis" <abatzis2@hotmail.com>
  >CC: scirocco-l@scirocco.org
  >Subject: Re: burning oil?
  >Date: Tue, 25 Feb 2003 04:26:06 +0000
  >
  >On Tue, 25 Feb 2003 03:49:24 +0000
  >"Michael Abatzis" <abatzis2@hotmail.com> wrote:
  >
  > > i've never understood this logic. let's for a moment assume that
  > > coolant temp in a warmed up engine is >100' (which i think is =
valid).
  > > at this point, both low and hi temp tstats are open, and coolant =
is
  > > going through both radiators. how are these two engines different =
at
  > > this point, and why would they run at different operating temps? =
yes,
  > > the lo temp stat would open earlier (say 70'), which may mean that =
it
  > > takes the engine longer to reach it's max operating temp, but i =
say it
  > > would still equilibrate at the same operating temp.
  >
  >The radiator should be capable of dissipating more heat than the =
engine
  >can give it. This means at 'normal' temperature and 'normal' load the
  >thermostat isn't fully open - it can open a little more. Once the
  >thermostat is fully open it looses all ability to regulate the
  >temperature, and the coolant temp becomes the equilibrium point =
between
  >the heat the engine gives off and the heat the rad can dissipate.
  >
  >If you have a choked rust filled radiator putting in a low temp
  >thermostat won't help. You will need a larger capacity radiator as =
well
  >as a low-temp thermostat to reduce the coolant temperature.
  >
  >--Andrew


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<DIV><FONT face=3DArial size=3D2>normal operating temp =3D thermo open =
temp if rad has=20
excess cooling capacity AT THAT TEMP.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>thermo will cycle =
open/closed/open/closed for quite=20
awhile after starting and reaching first cycle of open.&nbsp; I've seen =
this=20
happen many times on my van.&nbsp; With the engine cover off, driving =
around,=20
the rad fan will blow cool/hot/cool/hot/cool and finally steadily =
warm.&nbsp;=20
The scenario must go like this;</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>start engine-thermo closed-coolant in =
engine warms=20
up-thermo opens-cold slug of coolant enters engine,&nbsp;cool coolant =
hits=20
thermo-thermo closes-cycles repeat about five times until the coolant is =

mixed/uniformly warm.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Larry</FONT></DIV>
<BLOCKQUOTE=20
style=3D"BORDER-LEFT: #000000 2px solid; MARGIN-LEFT: 5px; MARGIN-RIGHT: =
0px; PADDING-LEFT: 5px; PADDING-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 href=3D"mailto:abatzis2@hotmail.com"; =
title=3Dabatzis2@hotmail.com>Michael=20
  Abatzis</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>To:</B> <A=20
  href=3D"mailto:scirocco-l@scirocco.org"=20
  title=3Dscirocco-l@scirocco.org>scirocco-l@scirocco.org</A> </DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Sent:</B> Monday, February 24, 2003 =
9:04=20
  PM</DIV>
  <DIV style=3D"FONT: 10pt arial"><B>Subject:</B> Re: burning oil?</DIV>
  <DIV><BR></DIV>is that true? isn't normal operating temp &gt; the =
thermo=20
  opening temp? so when <BR>the engine's warm, the thermo isn't open all =
the=20
  way? my impression was the <BR>thermostat is either open or=20
  closed...<BR><BR><BR>-Michael Abatzis<BR>Hotlanta! GA<BR>1988 Scirocco =
2L 16v=20
  RIP--&gt;parting, finally taking orders: <BR><A=20
  =
href=3D"http://www.learnlink.emory.edu/~mabatzi/mikes_page1.html";>www.lea=
rnlink.emory.edu/~mabatzi/mikes_page1.html</A><BR>1987=20
  Scirocco 2L 16v...<BR><BR><BR><BR><BR>&gt;From: Andrew Basterfield =
&lt;<A=20
  =
href=3D"mailto:list@cemetery.homeunix.org";>list@cemetery.homeunix.org</A>=
&gt;<BR>&gt;To:=20
  "Michael Abatzis" &lt;<A=20
  =
href=3D"mailto:abatzis2@hotmail.com";>abatzis2@hotmail.com</A>&gt;<BR>&gt;=
CC: <A=20
  =
href=3D"mailto:scirocco-l@scirocco.org";>scirocco-l@scirocco.org</A><BR>&g=
t;Subject:=20
  Re: burning oil?<BR>&gt;Date: Tue, 25 Feb 2003 04:26:06=20
  +0000<BR>&gt;<BR>&gt;On Tue, 25 Feb 2003 03:49:24 =
+0000<BR>&gt;"Michael=20
  Abatzis" &lt;<A=20
  href=3D"mailto:abatzis2@hotmail.com";>abatzis2@hotmail.com</A>&gt;=20
  wrote:<BR>&gt;<BR>&gt; &gt; i've never understood this logic. let's =
for a=20
  moment assume that<BR>&gt; &gt; coolant temp in a warmed up engine is =
&gt;100'=20
  (which i think is valid).<BR>&gt; &gt; at this point, both low and hi =
temp=20
  tstats are open, and coolant is<BR>&gt; &gt; going through both =
radiators. how=20
  are these two engines different at<BR>&gt; &gt; this point, and why =
would they=20
  run at different operating temps? yes,<BR>&gt; &gt; the lo temp stat =
would=20
  open earlier (say 70'), which may mean that it<BR>&gt; &gt; takes the =
engine=20
  longer to reach it's max operating temp, but i say it<BR>&gt; &gt; =
would still=20
  equilibrate at the same operating temp.<BR>&gt;<BR>&gt;The radiator =
should be=20
  capable of dissipating more heat than the engine<BR>&gt;can give it. =
This=20
  means at 'normal' temperature and 'normal' load the<BR>&gt;thermostat =
isn't=20
  fully open - it can open a little more. Once the<BR>&gt;thermostat is =
fully=20
  open it looses all ability to regulate the<BR>&gt;temperature, and the =
coolant=20
  temp becomes the equilibrium point between<BR>&gt;the heat the engine =
gives=20
  off and the heat the rad can dissipate.<BR>&gt;<BR>&gt;If you have a =
choked=20
  rust filled radiator putting in a low temp<BR>&gt;thermostat won't =
help. You=20
  will need a larger capacity radiator as well<BR>&gt;as a low-temp =
thermostat=20
  to reduce the coolant=20
  =
temperature.<BR>&gt;<BR>&gt;--Andrew<BR><BR><BR>_________________________=
________________________________________<BR>MSN=20
  8 with e-mail virus protection service: 2 months FREE*&nbsp; <BR><A=20
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___________<BR>Scirocco-l=20
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  =
href=3D"mailto:Scirocco-l@scirocco.org";>Scirocco-l@scirocco.org</A><BR><A=
=20
  =
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