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OEM thermostats when fail they do so closed. With other thermostats it
can be open, closed or in between. Anyway when a thermostat fails, which
is not very often, you soon notice the result on the temperature gauge!!
Kees Oudesluijs
Op 13-9-2018 om 16:14 schreef Bob Spidell:
>
> One other consideration:Â I have heard--note: hearsay--that the OEM
> sleeved stats are of the 'fail closed' variety. Have seen modern ones
> called 'fail open' or, even 'failsafe.'
>
> FWIW.
>
> Bob
>
>
> On 9/11/2018 3:44 PM, Roger Grace wrote:
>> Steve,
>> Yes agree with your take on the 160 F thermostats. The only possible
>> benefit is that if you start with a lower coolant temp, when you hit
>> traffic, it will take longer before the dreaded over temp zone is
>> approached.
>> As an aside, I have installed an oil temp gauge; very useful and a
>> reminder just how long the engine (not coolant) takes to get up to
>> temp. Trying to get in the habit of not going over 2000 RPM till OT
>> is about 120F â?? often another 15-20 mins after the thermostat opens.
>> rg
>> *From:* BJ8Healeys
>> *Sent:* Monday, September 10, 2018 12:44 PM
>> *To:* 'healeys'
>> *Subject:* Re: [Healeys] Thermostats
>>
>> Fred, I personally believe a 160-deg. F thermostat used in an effort
>> to "cool down" a Healey is useless. A thermostat responds only to
>> the temperature of the coolant flowing through it by opening up to
>> increase coolant flow, and once it is open all the way at 160+, it is
>> out of the loop and can't open further to cool more. I am on the NC
>> coast where winters are mild. I once tried a 160 (non-sleeved)
>> because I had one that someone gave me. My BJ8 ran so cold that
>> winter that I actually had to block part of the radiator to raise it
>> to anywhere near normal. Up there in the NC mountains, that would be
>> even more of a problem for you.
>>
>> I use a 187 F (86 C) New Old Stock AC sleeved thermostat (AC part
>> number 1572320) that I was able to score from lister Kees
>> Oudesluijs. I installed it along with an upgraded core in the
>> radiator at the same time, so I can't really say how much improvement
>> the thermostat alone did; but since the modification my car runs
>> consistently at 170 - 180 in the hot summers of the NC coast, except
>> when in stop-and-go traffic when it might make it to 190 or a bit
>> above. In winter, it runs at 160 - 170. I can see the sleeve
>> operate as the car warms up because the gauge will cycle between 160
>> and 190 until coolant temperature stabilizes. That can take up to 50
>> miles.
>>
>> A friend placed an order later with Kees for several of the 190 F
>> sleeved thermostats. I got one of those as a spare. Don't know if
>> he has any left, or can get more. As far as I know, the only sleeved
>> thermostats available from the usual suspects are 160s and I wouldn't
>> waste my money on them.
>>
>> I just Googled the AC part number and came up with this source:
>>
>> *https://tinyurl.com/y9c6n53h*
>>
>> Unfortunately, it does not post to the USA (but on the bright side,
>> it offers free shipping!). Maybe you could work out a deal with a UK
>> lister to buy one for you and ship it to you. £19.99 = $26.04
>>
>> Steve Byers
>>
>> HBJ8L/36666
>>
>> BJ8 Registry
>>
>> AHCA Delegate at Large
>>
>> Havelock, NC
>>
>>
>
>
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<p>OEM thermostats when fail they do so closed. With other
thermostats it can be open, closed or in between. Anyway when a
thermostat fails, which is not very often, you soon notice the
result on the temperature gauge!!</p>
<p>Kees Oudesluijs</p>
<p><br>
</p>
<p><br>
</p>
<div class="moz-cite-prefix">Op 13-9-2018 om 16:14 schreef Bob
Spidell:<br>
</div>
<blockquote type="cite"
cite="mid:7d34b0f5-05bc-17b5-e7f8-9d1b931a3750@comcast.net">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<p>One other consideration:Â I have heard--note: hearsay--that the
OEM sleeved stats are of the 'fail closed' variety. Have seen
modern ones called 'fail open' or, even 'failsafe.'</p>
<p>FWIW.</p>
<p>Bob<br>
</p>
<br>
<div class="moz-cite-prefix">On 9/11/2018 3:44 PM, Roger Grace
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:D64BDA78E881479D89764D868E5E9366@WINDOWST93OFP9">
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MS';
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<div>Steve,</div>
<div>Yes agree with your take on the 160 F thermostats. The
only possible benefit is that if you start with a lower
coolant temp, when you hit traffic, it will take longer
before the dreaded over temp zone is approached.</div>
<div>As an aside, I have installed an oil temp gauge; very
useful and a reminder just how long the engine (not
coolant) takes to get up to temp. Trying to get in the
habit of not going over 2000 RPM till OT is about 120F â??
often another 15-20 mins after the thermostat opens. </div>
<div>rg</div>
<div style="FONT-SIZE: small; TEXT-DECORATION: none;

FONT-FAMILY: "Calibri"; FONT-WEIGHT:
normal;
 COLOR: #000000; FONT-STYLE: normal; DISPLAY:
inline">
<div style="FONT: 10pt tahoma">
<div>Â </div>
<div style="BACKGROUND: #f5f5f5">
<div style="font-color: black"><b>From:</b> <a
title="sbyers@ec.rr.com"
moz-do-not-send="true">BJ8Healeys</a>
</div>
<div><b>Sent:</b> Monday, September 10, 2018 12:44 PM</div>
<div><b>To:</b> <a title="Healeys@autox.team.net"
moz-do-not-send="true">'healeys'</a> </div>
<div><b>Subject:</b> Re: [Healeys] Thermostats</div>
</div>
</div>
<div>Â </div>
</div>
<div style="FONT-SIZE: small; TEXT-DECORATION: none;

FONT-FAMILY: "Calibri"; FONT-WEIGHT:
normal;
 COLOR: #000000; FONT-STYLE: normal; DISPLAY:
inline">
<div class="WordSection1">
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">Fred, I personally believe a 160-deg. F
thermostat used in an effort to "cool down" a Healey
is useless. A thermostat responds only to the
temperature of the coolant flowing through it by
opening up to increase coolant flow, and once it is
open all the way at 160+, it is out of the loop and
can't open further to cool more. I am on the NC
coast where winters are mild. I once tried a 160
(non-sleeved) because I had one that someone gave
me. My BJ8 ran so cold that winter that I actually
had to block part of the radiator to raise it to
anywhere near normal. Up there in the NC mountains,
that would be even more of a problem for
you.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">I use a 187 F (86 C) New Old Stock AC
sleeved thermostat (AC part number 1572320) that I
was able to score from lister Kees Oudesluijs. I
installed it along with an upgraded core in the
radiator at the same time, so I can't really say how
much improvement the thermostat alone did; but since
the modification my car runs consistently at 170 -
180 in the hot summers of the NC coast, except when
in stop-and-go traffic when it might make it to 190
or a bit above. In winter, it runs at 160 - 170. I
can see the sleeve operate as the car warms up
because the gauge will cycle between 160 and 190
until coolant temperature stabilizes. That can take
up to 50 miles.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">A friend placed an order later with Kees
for several of the 190 F sleeved thermostats. I got
one of those as a spare. Don't know if he has any
left, or can get more. As far as I know, the only
sleeved thermostats available from the usual
suspects are 160s and I wouldn't waste my money on
them.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">I just Googled the AC part number and came
up with this source:<o:p></o:p></span></p>
<p class="MsoNormal"><b><span style="FONT-SIZE:
11pt;
 FONT-FAMILY: "Comic Sans MS";
COLOR:
 #002060"><a
href="https://tinyurl.com/y9c6n53h";
moz-do-not-send="true">https://tinyurl.com/y9c6n53h</a><o:p></o:p></span></b></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">Unfortunately, it does not post to the USA
(but on the bright side, it offers free shipping!).Â
Maybe you could work out a deal with a UK lister to
buy one for you and ship it to you. £19.99 = $26.04
</span><span style="FONT-SIZE: 11pt; FONT-FAMILY:
"Comic Sans
 MS"; COLOR:
#002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060"><o:p></o:p></span>Â </p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">Steve Byers</span><span
style="FONT-SIZE:
 11pt; FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">HBJ8L/36666</span><span
style="FONT-SIZE:
 11pt; FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">BJ8 Registry</span><span
style="FONT-SIZE:
 11pt; FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">AHCA Delegate at Large</span><span
style="FONT-SIZE: 11pt; FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060">Havelock, NCÂ </span><span
style="FONT-SIZE:
 11pt; FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY:

"Calibri","sans-serif";
COLOR:
 #002060"><o:p></o:p></span>Â </p>
<p class="MsoNormal"><span style="FONT-SIZE: 11pt;

FONT-FAMILY: "Comic Sans MS"; COLOR:

#002060"><o:p></o:p></span><br>
</p>
</div>
</div>
</div>
</div>
</blockquote>
<br>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset>
<pre class="moz-quote-pre"
wrap="">_______________________________________________
Archive: <a class="moz-txt-link-freetext"
href="http://www.team.net/pipermail/healeys";>http://www.team.net/pipermail/healeys</a>
<a class="moz-txt-link-abbreviated"
href="mailto:Healeys@autox.team.net";>Healeys@autox.team.net</a>
<a class="moz-txt-link-freetext"
href="http://autox.team.net/mailman/listinfo/healeys";>http://autox.team.net/mailman/listinfo/healeys</a>
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