[Healeys] radiator thermostat

[David Nock]

The thermostat does not control the high end temperature of the engine. 
Its job is to get the engine up to an operating temperature as soon as 
possible. Then in maintains the low end temperature of the engine. Once 
the thermostat is open the engine temperature is controlled by the 
radiator, radiator fan and air flow.

On the 6 cylinder engine there is a sleeve attached to the thermostat, 
that blocks off a bypass in the cylinder head. The bypass is there to 
allow the coolant to flow when the thermostat is closed. Once the 
thermostat is open the sleeve is there to block the bypass allowing ALL 
the coolant to flow thru the radiator.

David Nock

British Car Specialists


On 9/17/2025 12:54 PM, Richard Mayor 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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-- 
David Nock
British Car Specialists
Stockton Ca
209 948 8767
www.britishcarspecialists.com
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