[Healeys] radiator thermostat

[Harold Manifold]

Hi All,

Thermostats always generate interesting discussions.

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.

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.

Harold

On Wed, Sep 17, 2025 at 1:36 PM Richard Mayor <boyracer466 at gmail.com> wrote:

> 165 is too cold for good running.  Our engines run better in the 180 to
> 190 range.
>
>
> Sent from my iPad
>
> On Sep 17, 2025, at 12:13 PM, Robert Markovich via Healeys <
> healeys at autox.team.net> wrote:
>
>  165 is the one I use
>
>
> Sent from the all new AOL app for iOS
> <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>
>
> On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys <
> healeys at autox.team.net> wrote:
>
> Gents,
>      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.
> rich antal
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