<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>
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<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>
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<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>
<div><br>-------------------- <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>
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<div>Hi All,</div>
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<div>Thermostats always generate interesting discussions.</div>
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<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>
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<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>
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<div>Harold</div>
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<div class="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>
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<div>165 is too cold for good running. Our engines run better in the 180 to 190 range.
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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><br></blockquote>
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<div>165 is the one I use<br><br><br>
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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>
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