[Healeys] radiator thermostat

[m.g.sharp at sympatico.ca]

I have run one of BCS (David’s) sleeved 160 thermostats in my BT7 for decades and I works perfectly.

 

Just say’n,

 

Mirek

 

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of David Nock via Healeys
Sent: September 18, 2025 11:37 AM
To: Richard Mayor <boyracer466 at gmail.com>; Robert Markovich <rmarkovich at aol.com>
Cc: Richard Antal <rantal243 at yahoo.com>; Healeys <healeys at autox.team.net>
Subject: Re: [Healeys] radiator thermostat

 

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  <mailto:healeys at autox.team.net> <healeys at autox.team.net> wrote:

 165 is the one I use



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On Wednesday, September 17, 2025, 2:50 PM, Richard Antal via Healeys  <mailto:healeys at autox.team.net> <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 <http://www.britishcarspecialists.com> 
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