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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. I've seen =
this=20
happen many times on my van. With the engine cover off, driving =
around,=20
the rad fan will blow cool/hot/cool/hot/cool and finally steadily =
warm. =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, 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 > 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-->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>>From: Andrew Basterfield =
<<A=20
=
href=3D"mailto:list@cemetery.homeunix.org">list@cemetery.homeunix.org</A>=
><BR>>To:=20
"Michael Abatzis" <<A=20
=
href=3D"mailto:abatzis2@hotmail.com">abatzis2@hotmail.com</A>><BR>>=
CC: <A=20
=
href=3D"mailto:scirocco-l@scirocco.org">scirocco-l@scirocco.org</A><BR>&g=
t;Subject:=20
Re: burning oil?<BR>>Date: Tue, 25 Feb 2003 04:26:06=20
+0000<BR>><BR>>On Tue, 25 Feb 2003 03:49:24 =
+0000<BR>>"Michael=20
Abatzis" <<A=20
href=3D"mailto:abatzis2@hotmail.com">abatzis2@hotmail.com</A>>=20
wrote:<BR>><BR>> > i've never understood this logic. let's =
for a=20
moment assume that<BR>> > coolant temp in a warmed up engine is =
>100'=20
(which i think is valid).<BR>> > at this point, both low and hi =
temp=20
tstats are open, and coolant is<BR>> > going through both =
radiators. how=20
are these two engines different at<BR>> > this point, and why =
would they=20
run at different operating temps? yes,<BR>> > the lo temp stat =
would=20
open earlier (say 70'), which may mean that it<BR>> > takes the =
engine=20
longer to reach it's max operating temp, but i say it<BR>> > =
would still=20
equilibrate at the same operating temp.<BR>><BR>>The radiator =
should be=20
capable of dissipating more heat than the engine<BR>>can give it. =
This=20
means at 'normal' temperature and 'normal' load the<BR>>thermostat =
isn't=20
fully open - it can open a little more. Once the<BR>>thermostat is =
fully=20
open it looses all ability to regulate the<BR>>temperature, and the =
coolant=20
temp becomes the equilibrium point between<BR>>the heat the engine =
gives=20
off and the heat the rad can dissipate.<BR>><BR>>If you have a =
choked=20
rust filled radiator putting in a low temp<BR>>thermostat won't =
help. You=20
will need a larger capacity radiator as well<BR>>as a low-temp =
thermostat=20
to reduce the coolant=20
=
temperature.<BR>><BR>>--Andrew<BR><BR><BR>_________________________=
________________________________________<BR>MSN=20
8 with e-mail virus protection service: 2 months FREE* <BR><A=20
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href=3D"http://join.msn.com/?page=3Dfeatures/virus">http://join.msn.com/?=
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___________<BR>Scirocco-l=20
mailing list<BR><A=20
=
href=3D"mailto:Scirocco-l@scirocco.org">Scirocco-l@scirocco.org</A><BR><A=
=20
=
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