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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.
Just another example of the garbage that is being sold in the parts =
stores these days. =20
=20
Richard Mayor
boyracer466@gmail.com
> On Sep 17, 2025, at 3:47=E2=80=AFPM, Hank Leach <gradea1@charter.net> =
wrote:
>=20
> 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 flowing thru the radiator. 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.
> =20
> 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.
> =20
> 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
>=20
> --------------------=20
>=20
> From: "Harold Manifold" <manifold@telus.net>=20
> To: "Richard Mayor" <boyracer466@gmail.com>=20
> Cc: "Richard Antal" <rantal243@yahoo.com>, "Healeys" =
<healeys@autox.team.net>=20
> Sent: September 17, 2025 at 3:05 PM PDT=20
> Subject: Re: [Healeys] radiator thermostat
> Hi All,
> =20
> Thermostats always generate interesting discussions.
> =20
> 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.
> =20
> 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.
> =20
> Harold
> =20
> On Wed, Sep 17, 2025 at 1:36=E2=80=AFPM Richard Mayor =
>> 165 is too cold for good running. Our engines run better in the 180 =
to 190 range. =20
>> =20
>>=20
>> Sent from my iPad
>>=20
>> On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via Healeys =
>>=20
>> 165 is the one I use
>>=20
>>=20
>> Sent from the all new AOL app for iOS =
<https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&c=3DUS_Acquisition_Y=
Mktg_320_EmailSignature_AttributionDL&af_sub1=3DAcquisition&af_sub2=3DUS_Y=
Mktg&af_sub3=3D&af_sub4=3D100002473&af_sub5=3DSentFromNewAOLApp__Interstit=
ial_&af_ios_store_cpp=3Dce85ce34-ad0f-4811-a92b-a172743b064e&af_android_ur=
l=3Dhttps%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 =
>>=20
>> 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
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>=20
>> Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys
>>=20
>> http://autox.team.net/mailman/listinfo/healeys
>>=20
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/healeys/rmarkovich@aol.com
>>=20
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>=20
>> Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys
>>=20
>> http://autox.team.net/mailman/listinfo/healeys
>>=20
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/healeys/boyracer466@gmail.com
>>=20
>> _______________________________________________
>> Support Team.Net http://www.team.net/donate.html
>> Suggested annual donation $12.75
>>=20
>> Archive: http://www.team.net/pipermail/healeys =
http://autox.team.net/archive/healeys
>>=20
>> http://autox.team.net/mailman/listinfo/healeys
>>=20
>> Unsubscribe/Manage: =
http://autox.team.net/mailman/options/healeys/manifold@telus.net
>>=20
>=20
> =20
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Content-Transfer-Encoding: quoted-printable
charset=utf-8
<html><head><meta http-equiv=3D"content-type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"overflow-wrap: break-word; =
-webkit-nbsp-mode: space; 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></div><div>Just another example of the garbage that is =
being sold in the parts stores these days. <div> <br =
id=3D"lineBreakAtBeginningOfMessage"><div>
<div>Richard =
Mayor</div><div>boyracer466@gmail.com</div><div><br></div><br =
class=3D"Apple-interchange-newline">
</div>
<div><br><blockquote type=3D"cite"><div>On Sep 17, 2025, at 3:47=E2=80=AFP=
M, Hank Leach <gradea1@charter.net> wrote:</div><br =
class=3D"Apple-interchange-newline"><div><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=3D"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>
<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>
<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>
</div>
<div> </div>
<div class=3D"gmail_quote gmail_quote_container">
<div class=3D"gmail_attr">On Wed, Sep 17, 2025 at 1:36=E2=80=AFPM =
Richard Mayor <<a =
href=3D"mailto:boyracer466@gmail.com";>boyracer466@gmail.com</a>> =
wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"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>
<div>
<div>Sent from my iPad</div>
<div><br>
<blockquote>On Sep 17, 2025, at 12:13=E2=80=AFPM, Robert Markovich via =
Healeys <<a href=3D"mailto:healeys@autox.team.net"; target=3D"_blank" =
rel=3D"noopener">healeys@autox.team.net</a>> =
wrote:<br><br></blockquote>
</div>
<blockquote>
<div>165 is the one I use<br><br><br>
<div><a style=3D"font-size: 12px;" =
href=3D"https://aolapp.onelink.me/eG2g?pid=3DNativePlacement&c=3DUS_Ac=
quisition_YMktg_320_EmailSignature_AttributionDL&af_sub1=3DAcquisition=
&af_sub2=3DUS_YMktg&af_sub3=3D&af_sub4=3D100002473&af_sub5=
=3DSentFromNewAOLApp__Interstitial_&af_ios_store_cpp=3Dce85ce34-ad0f-4=
811-a92b-a172743b064e&af_android_url=3Dhttps%3A%2F%2Fplay.google.com%2=
Fstore%2Fapps%2Fdetails%3Fid%3Dcom.aol.mobile.aolapp%26listing%3Demail_sig=
nature_attribution" target=3D"_blank" rel=3D"noopener">Sent from the all =
new AOL app for iOS</a></div>
<br><p style=3D"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=3D"mailto:healeys@autox.team.net"; =
target=3D"_blank" rel=3D"noopener">healeys@autox.team.net</a>> =
wrote:</p>
<blockquote>
<div id=3D"m_3862331438548245316yiv6324880639">
<div>
<div style=3D"font-family: 'Helvetica Neue',Helvetica,Arial,sans-serif; =
font-size: 13px;">
<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>
</div>
</div>
_______________________________________________<br>Support Team.Net <a =
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