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Something else to remember is that the temperature bulb is located either in the top tank of the radiator 100's & 100/6 or directly below the thermostat housing where the coolant which has passed through the radiator enters the engine. This means that the coolant
in the engine and exiting from the engine is probably significantly hotter. </div>
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Has anyone actually measured the temperature of the coolant as it enters the radiator at the bottom?</div>
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It could well be that magic 185°F that an engine apparently requires for best operation occurs at a significantly lower indicated temperature. </div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Healeys <healeys-bounces@autox.team.net> on behalf of richard mayor <boyracer466@gmail.com><br>
<b>Sent:</b> Wednesday, September 17, 2025 7:09:14 PM<br>
<b>To:</b> Leach Hank <gradea1@charter.net><br>
<b>Cc:</b> Richard Antal <rantal243@yahoo.com>; Healeys <healeys@autox.team.net><br>
<b>Subject:</b> Re: [Healeys] radiator thermostat</font>
<div> </div>
</div>
<div style="line-break:after-white-space">Hank makes a very good point about where to measure the water temp. And to get an infrared temperature sensor. I recently fired up a fresh V8 engine to break in the cam. I had also bought a new water temp gauge with
sensor. The new sensor was screwed into a port on the cylinder head. As we were running the engine I saw the temp climb and approach 220 degrees but fortunately I had my infrared sensor. The water temp was actually quite lower and I was able to take readings
from various places in the system. If I had relied solely on the gauge I would have freaked out and probably shut the engine down.
<div><br>
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<div>Just another example of the garbage that is being sold in the parts stores these days.
<div> <br id="x_lineBreakAtBeginningOfMessage">
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<div>Richard Mayor</div>
<div>boyracer466@gmail.com</div>
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<blockquote type="cite">
<div>On Sep 17, 2025, at 3:47 PM, Hank Leach <gradea1@charter.net> wrote:</div>
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<div>I would like to comment about the position of the temperature "sensor" found in the Healey. All of them-100s and 3000s measure the water/antifreeze temperature
<span style="text-decoration:underline">flowing thru the radiator</span>. That is not necessarily the temperature of the engine itself. Using a heat detector gun (Harbor Freight) you can actually see the head, block and exhaust readings and they will be different
than the degrees indicated which has been read in the water flowing and transferred down a long capillary tube to an analog gauge.</div>
<div> </div>
<div>In contrast, most older American cars, and incidentally the Jensen-Healey, measure the temperature of the manifold, or the block, by electronic sensor to an analog gauge.</div>
<div> </div>
<div>I'm sure todays' vehicles have more accurate measurements, but they don't tell us what that actual number is unless an icon illuminates on the dash indicating a problem with temperature. I guess that ancient type of measurement is what gives the Healey
its charm. Be it Fahrenheit or Centigrade. Hank</div>
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-------------------- <br>
<br>
From: "Harold Manifold" <manifold@telus.net> <br>
To: "Richard Mayor" <boyracer466@gmail.com> <br>
Cc: "Richard Antal" <rantal243@yahoo.com>, "Healeys" <healeys@autox.team.net> <br>
Sent: September 17, 2025 at 3:05 PM PDT <br>
Subject: Re: [Healeys] radiator thermostat </div>
<div>
<div>Hi All,</div>
<div> </div>
<div>Thermostats always generate interesting discussions.</div>
<div> </div>
<div>I use a 180-degree thermostat in my car. However, what's equally important is how effectively the thermostat regulates the coolant temperature. A thermostat that is fully closed or fully open is no longer actively controlling the temperature. The normal
operating range is typically the opening temperature plus 20 degrees. For example, a 165-degree thermostat should maintain the temperature between 165 and 185 degrees, while a 180-degree thermostat should keep it between 180 and 200 degrees.</div>
<div> </div>
<div>If your current thermostat maintains the coolant temperature within its specified range under normal driving conditions, then it's the correct one for your needs.</div>
<div> </div>
<div>Harold</div>
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<div class="x_gmail_quote x_gmail_quote_container">
<div class="x_gmail_attr">On Wed, Sep 17, 2025 at 1:36 PM Richard Mayor <<a href="mailto:boyracer466@gmail.com">boyracer466@gmail.com</a>> wrote:</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px 0.8ex; border-left:1px solid rgb(204,204,204); padding-left:1ex">
<div>165 is too cold for good running. Our engines run better in the 180 to 190 range.
<div> </div>
<div><br>
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<div>Sent from my iPad</div>
<div><br>
<blockquote>On Sep 17, 2025, at 12:13 PM, Robert Markovich via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank" rel="noopener">healeys@autox.team.net</a>> wrote:<br>
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<div>165 is the one I use<br>
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<br>
<div><a href="https://aolapp.onelink.me/eG2g?pid=NativePlacement&c=US_Acquisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=Acquisition&af_sub2=US_YMktg&af_sub3=&af_sub4=100002473&af_sub5=SentFromNewAOLApp__Interstitial_&af_ios_store_cpp=ce85ce34-ad0f-4811-a92b-a172743b064e&af_android_url=https%3A%2F%2Fplay.google.com%2Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_signature_attribution" target="_blank" rel="noopener" style="font-size:12px">Sent
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<p style="font-size:15px; color:rgb(132,115,255); padding-top:15px; margin-top:0px">
On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys <<a href="mailto:healeys@autox.team.net" target="_blank" rel="noopener">healeys@autox.team.net</a>> wrote:</p>
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<div>Gents,</div>
<div> What is the desired coolant temperature for optimal engine performance? I've searched the tech articles and can find nothing that specifically answers that question. This summer my BJ8 seemed to run fine with a 160 thermostat which, according to the
gauge which I've checked and found to be accurate, kept the coolant at around 165. Thanks to all who respond.</div>
<div>rich antal</div>
</div>
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