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Hello,
There's been a comment that the list has been quiet lately and we need a
topic that will generate more discussion. I'd like to suggest Healey
cooling and thermostats as a potential topic.
A general comment about systems with a control valve, which describes a
Healey cooling system: for the system to be controlled by the thermostat,
it should never be 100% open or closed. When fully open or closed, the
thermostat isn't controlling. Ideally, the thermostat would be 50% open
when the engine is fully warmed up on a 70=C2=B0F day. I've found my 180=C2=
=B0
thermostat controls well in the summer, but when the temperature drops
below 60=C2=B0F, it takes a long time for the thermostat to start opening, =
and
it likely operates in a narrow portion of its range. It makes sense to
switch to a 160=C2=B0 thermostat for driving in temperatures below 60=C2=B0=
F for
extended periods.
There's a bypass in the block that allows water to recirculate without
crossing the thermostat and entering the radiator. This aids faster warm-up
and prevents the water pump from dead-heading when the thermostat is
closed. As others have mentioned, the older bellows-style thermostats had a
sleeve that restricted bypass flow as the thermostat opened. I've been told
the 4-cylinder Healey engines lack this bypass. Blocking the bypass will
slow engine warm-up; the bypass should be restricted once the water reaches
180=C2=B0.
I'm aware of a couple of options to restrict the bypass. The easiest is to
use a FlowKooler thermostat, which I use. They're high-quality, high-flow
thermostats that partially restrict the bypass when open. The other
practical option is to modify a Land Rover thermostat (Land Rover
Thermostat 596225, for those interested). The sleeve must be cut off the
top so it sits flush in the housing. I used a Dremel to cut the sleeve off
and have pictures if anyone is interested.
You have the correct temperature thermostat when the water temperature
stays within 20=C2=B0F of the opening temperature under most driving condit=
ions.
Comments are welcome.
Regards,
Harold
On Mon, Feb 17, 2025 at 3:44=E2=80=AFAM sbyers--- via Healeys <
healeys@autox.team.net> wrote:
> Since I tried Hylomar, it is all that I use on gaskets (Permatex has an
> equivalent). It seals well and is non-setting.
>
> For thermostats, I tried the sleeved 160 that Moss offered (apparently no
> one had a sleeved 180) in my BJ8 and found that in the wintertime I had t=
o
> actually block half of the radiator to get the coolant to come up to
> temperature. Later, I was fortunate to be able to score an original NOS
> sleeved 180 made by AC from Kees Oudersluijs who was active on this list
> and got a couple of spares as insurance.
>
> A thermostat doesn=E2=80=99t really =E2=80=9Ccontrol=E2=80=9D the coolant=
temperature, but reacts
> to it depending on the coolant flow and temperature of the air through th=
e
> radiator. Initially, it limits the flow for faster warm-up of the
> engine. Once it is wide open, it is out of the loop.
>
>
>
> Steve Byers
>
> BJ8 Registry
>
> AHCA Delegate at Large
>
>
>
> *From:* Healeys <healeys-bounces@autox.team.net> *On Behalf Of *Michael
> Oritt
> *Sent:* Sunday, February 16, 2025 7:06 PM
> *To:* Healeys at Autox <healeys@autox.team.net>
> *Subject:* [Healeys] Thermostat gasket sealant
>
>
>
> My 100 will not come up to temperature (at least yet) with a 160
> thermostat. I am putting in a 180 and wonder what is the preferred gaske=
t
> dressing?
>
>
>
> Best--Michael Oritt
> _______________________________________________
> Support Team.Net http://www.team.net/donate.html
> Suggested annual donation $12.75
>
> Archive: http://www.team.net/pipermail/healeys
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>
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>
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>
>
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<div dir=3D"ltr"><div></div><div>Hello,</div><div><br></div><div>There'=
s been a comment that the list has been quiet lately and we need a topic th=
at will generate more discussion. I'd like to suggest Healey cooling an=
d thermostats as a potential topic.</div><div><br></div><div>A general comm=
ent about systems with a control valve, which describes a Healey cooling sy=
stem: for the system to be controlled by the thermostat, it should never be=
100% open or closed. When fully open or closed, the thermostat isn't c=
ontrolling. Ideally, the thermostat would be 50% open when the engine is fu=
lly warmed up on a 70=C2=B0F day. I've found my 180=C2=B0 thermostat co=
ntrols well in the summer, but when the temperature drops below 60=C2=B0F, =
it takes a long time for the thermostat to start opening, and it likely ope=
rates in a narrow portion of its range. It makes sense to switch to a 160=
=C2=B0 thermostat for driving in temperatures below 60=C2=B0F for extended =
periods.</div><div><br></div><div>There's a bypass in the block that al=
lows water to recirculate without crossing the thermostat and entering the =
radiator. This aids faster warm-up and prevents the water pump from dead-he=
ading when the thermostat is closed. As others have mentioned, the older be=
llows-style thermostats had a sleeve that restricted bypass flow as the the=
rmostat opened. I've been told the 4-cylinder Healey engines lack this =
bypass. Blocking the bypass will slow engine warm-up; the bypass should be =
restricted once the water reaches 180=C2=B0.</div><div><br></div><div>I'=
;m aware of a couple of options to restrict the bypass. The easiest is to u=
se a FlowKooler thermostat, which I use. They're high-quality, high-flo=
w thermostats that partially restrict the bypass when open. The other pract=
ical option is to modify a Land Rover thermostat (Land Rover Thermostat 596=
225, for those interested). The sleeve must be cut off the top so it sits f=
lush in the housing. I used a Dremel to cut the sleeve off and have picture=
s if anyone is interested.</div><div><br></div><div>You have the correct te=
mperature thermostat when the water temperature stays within 20=C2=B0F of t=
he opening temperature under most driving conditions.</div><div><br></div><=
div>Comments are welcome. </div><div><br></div><div>Regards,</div><div>Haro=
ld</div><div><br></div></div><br><div class=3D"gmail_quote gmail_quote_cont=
ainer"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Feb 17, 2025 at 3:44=
=E2=80=AFAM sbyers--- via Healeys <<a href=3D"mailto:healeys@autox.team.=
net">healeys@autox.team.net</a>> wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex"><div class=3D"msg1469297646709061552"><div lang=
=3D"EN-US" style=3D"overflow-wrap: break-word;"><div class=3D"m_14692976467=
09061552WordSection1"><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos=
"><span style=3D"font-size:11pt">Since I tried Hylomar, it is all that I us=
e on gaskets (Permatex has an equivalent).<span>=C2=A0 </span>It seals well=
and is non-setting.<u></u><u></u></span></font></p><p class=3D"MsoNormal">=
<font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt">For thermost=
ats, I tried the sleeved 160 that Moss offered (apparently no one had a sle=
eved 180) in my BJ8 and found that in the wintertime I had to actually bloc=
k half of the radiator to get the coolant to come up to temperature.<span>=
=C2=A0 </span>Later, I was fortunate to be able to score an original NOS sl=
eeved 180 made by AC from Kees Oudersluijs who was active on this list and =
got a couple of spares as insurance.<span>=C2=A0 </span><u></u><u></u></spa=
n></font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span s=
tyle=3D"font-size:11pt">A thermostat doesn=E2=80=99t really =E2=80=9Ccontro=
l=E2=80=9D the coolant temperature, but reacts to it depending on the coola=
nt flow and temperature of the air through the radiator. <span>=C2=A0=C2=A0=
</span>Initially, it limits the flow for faster warm-up of the engine.<span=
>=C2=A0 </span>Once it is wide open, it is out of the loop.<u></u><u></u></=
span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><spa=
n style=3D"font-size:11pt"><u></u>=C2=A0<u></u></span></font></p><p class=
=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><span style=3D"font-size:11p=
t">Steve Byers<u></u><u></u></span></font></p><p class=3D"MsoNormal"><font =
size=3D"2" face=3D"Aptos"><span style=3D"font-size:11pt">BJ8 Registry<u></u=
><u></u></span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"A=
ptos"><span style=3D"font-size:11pt">AHCA Delegate at Large<u></u><u></u></=
span></font></p><p class=3D"MsoNormal"><font size=3D"2" face=3D"Aptos"><spa=
n style=3D"font-size:11pt"><u></u>=C2=A0<u></u></span></font></p><div style=
=3D"border-right:none;border-bottom:none;border-left:none;border-top:1pt so=
lid rgb(225,225,225);padding:3pt 0in 0in"><p class=3D"MsoNormal"><b><font s=
ize=3D"2" face=3D"Calibri"><span style=3D"font-size:11pt;font-family:Calibr=
i,sans-serif;font-weight:bold">From:</span></font></b><font size=3D"2" face=
=3D"Calibri"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif">=
Healeys <<a href=3D"mailto:healeys-bounces@autox.team.net"; target=3D"_b=
lank">healeys-bounces@autox.team.net</a>> <b><span style=3D"font-weight:=
bold">On Behalf Of </span></b>Michael Oritt<br><b><span style=3D"font-weigh=
t:bold">Sent:</span></b> Sunday, February 16, 2025 7:06 PM<br><b><span styl=
e=3D"font-weight:bold">To:</span></b> Healeys at Autox <<a href=3D"mailt=
o:healeys@autox.team.net" target=3D"_blank">healeys@autox.team.net</a>><=
br><b><span style=3D"font-weight:bold">Subject:</span></b> [Healeys] Thermo=
stat gasket sealant<u></u><u></u></span></font></p></div><p class=3D"MsoNor=
mal"><font size=3D"3" face=3D"Aptos"><span style=3D"font-size:12pt"><u></u>=
=C2=A0<u></u></span></font></p><div><div><p class=3D"MsoNormal"><font size=
=3D"3" color=3D"#3333ff" face=3D"Aptos"><span style=3D"font-size:12pt;color=
:rgb(51,51,255)">My 100 will not come up to temperature (at least yet) with=
a 160 thermostat.=C2=A0 I am putting in a 180 and wonder what is the prefe=
rred gasket dressing?<u></u><u></u></span></font></p></div><div><p class=3D=
"MsoNormal"><font size=3D"3" color=3D"#3333ff" face=3D"Aptos"><span style=
=3D"font-size:12pt;color:rgb(51,51,255)"><u></u>=C2=A0<u></u></span></font>=
</p></div><div><p class=3D"MsoNormal"><font size=3D"3" color=3D"#3333ff" fa=
ce=3D"Aptos"><span style=3D"font-size:12pt;color:rgb(51,51,255)">Best--Mich=
ael Oritt<u></u><u></u></span></font></p></div></div></div></div>__________=
_____________________________________<br>
rer" target=3D"_blank">http://www.team.net/donate.html</a><br>
<br>
Archive: <a href=3D"http://www.team.net/pipermail/healeys"; rel=3D"noreferre=
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<br>
</div></blockquote></div>
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