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Yes, no doubt that idling after a high speed run when the engine was
working hard with increased losses is the worst situation for our cars.
Another technique to help the "reserve" is to install an overflow recovery
tank that ensures you start off with a full header tank. This is a
relatively simple project and works well.
I am a bit of a temp nut. On my BJ8, display via multiplexed switches :
WT - Smiths std gauge
OT- oil temp at filter
EC - engine compartment near carb intakes
TH - top hose water temp
Input ambient to rad and cockpit temps just for interest.
5 Blade TX fan; oil cooler; EWP electric water pump - manually switched;
160F thermostat - agree with Michael above; rad recovery. As per Harold
have 2 x 3/16 holes in thermostat; AL finned sump.
Most interesting observations are:
Oil takes longer than we think to get close to operating temp at least 30
min but depends on ambient.Often long after the stat. opens
TH is generally 10F lower than the WT reading
EC and OT rise rapidly when no airflow as MS describes. rg thinks that we
under estimate the cooling effect of cruising airflow on the actual engine
block surface. Airflow is somewhat limited as a big chunk of metal
obstructs and no easy exit. Often wondered if an extractor fan would help -
hence the louvres on the hood and sides to get the hot air out for
competition cars. My car runs badly when EC is above 155F - becomes too
rich for the inlet air.
Use the EWP when approaching traffic as above - does not reduce temp, but
seems to prevent further increases. Important to anticipate. EWP is really
good for controlling heat soak after cutting the engine.
Recently removed an electric rad pusher fan as no real benefit and an
obstruction to incoming air. Rad inlet deflectors are important
Hi ambient of course is a big factor for rad and block cooling.
Monitoring OT is very useful and easy to relate to when driving.
rg
On Sat, Dec 28, 2024 at 9:42=E2=80=AFAM Michael Salter <michaelsalter@gmail=
.com>
wrote:
> Like most 100 drivers I have struggled with overheating problems on
> occasion.
> The worst situation is when stopping for gas or becoming stalled in
> traffic on the highway after running at high speed.
> On those occasions when I do drive in cooler temperatures the temperature
> usually reaches 75 - 80 degrees C (167 - 176 F) even without a thermostat
> although the warm up is a little slower.
> The advantage of running at this cooler temperature is that the system
> seems to have a larger "reserve" when the above traffic problems occur.
> I found that the indicated temperature (which is accurate), runs 5 degree=
s
> C higher even when using a 165 degree bellows or wax pellet type
> thermostat. I suspect this is due to the slight restriction even when the
> thermostat is fully open.
>
> M
>
> On Sat, Dec 28, 2024 at 8:32=E2=80=AFAM Michael Oritt <michael.oritt@gmai=
l.com>
> wrote:
>
>> I need to replace my thermostat and I see a lot of negative reviews for
>> "Failsafe" units--sold my Moss and many others--which are designed to fa=
il
>> in the open mode. What is the collective experience with these?
>>
>> TIA--Michael Oritt
>> _______________________________________________
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<div dir=3D"ltr"><div>Yes, no doubt that idling after a high speed run when=
the engine was working hard with increased losses is the worst situation f=
or our cars. Another technique to help the "reserve" is to instal=
l an overflow recovery tank that ensures you start off with a full header t=
ank. This is a relatively simple project and works well.</div><div>I am a b=
it of a temp nut. On my BJ8, display via multiplexed switches :<br></div><d=
iv>WT - Smiths std gauge<br></div><div>OT- oil temp at filter</div><div>EC =
- engine compartment near carb intakes</div><div>TH - top hose water temp<b=
r></div><div>Input ambient to rad and cockpit temps just for interest.<br><=
/div><div>5 Blade TX fan; oil cooler; EWP electric water pump - manually sw=
itched; 160F thermostat - agree with Michael above; rad recovery. As per Ha=
rold have 2 x 3/16 holes in thermostat; AL finned sump.<br></div><div>Most =
interesting observations are:</div><div>Oil takes longer than we think to g=
et close to operating temp at least 30 min but depends on ambient.Often lon=
g after the stat. opens<br></div><div>TH is generally 10F lower than the WT=
reading</div><div>EC and OT rise rapidly when no airflow as MS describes. =
rg thinks that we under estimate the cooling effect of cruising airflow on =
the actual engine block surface. Airflow is somewhat limited as a big chunk=
of metal obstructs and no easy exit. Often wondered if an extractor fan wo=
uld help - hence the louvres on the hood and sides to get the hot air out f=
or competition cars. My car runs badly when EC is above 155F - becomes too =
rich for the inlet air.</div><div>Use the EWP when approaching traffic as a=
bove - does not reduce temp, but seems to prevent further increases. Import=
ant to anticipate. EWP is really good for controlling heat soak after cutti=
ng the engine.<br></div><div>Recently removed an electric rad pusher fan as=
no real benefit and an obstruction to incoming air. Rad inlet deflectors a=
re important<br></div><div>Hi ambient of course is a big factor for rad and=
block cooling.</div><div>Monitoring OT is very useful and easy to relate t=
o when driving.<br></div><div>rg<br></div><div><br></div><div><br></div><di=
v><br></div><div><br></div><div><br></div></div><br><div class=3D"gmail_quo=
te"><div dir=3D"ltr" class=3D"gmail_attr">On Sat, Dec 28, 2024 at 9:42=E2=
=80=AFAM Michael Salter <<a href=3D"mailto:michaelsalter@gmail.com"; targ=
et=3D"_blank">michaelsalter@gmail.com</a>> wrote:<br></div><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px soli=
d rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_d=
efault" style=3D"font-family:arial,sans-serif;font-size:small">Like most 10=
0 drivers I have struggled with overheating problems on occasion.</div><div=
class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-size:sm=
all">The worst situation is when stopping for gas or becoming stalled in tr=
affic on the highway after running at high speed.</div><div class=3D"gmail_=
default" style=3D"font-family:arial,sans-serif;font-size:small"></div><div =
class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-size:sma=
ll">On those occasions when I do drive in cooler temperatures the temperatu=
re usually reaches 75 - 80 degrees C (167 - 176 F) even without a thermosta=
t although the warm up is a little slower. <br></div><div class=3D"gmail_de=
fault" style=3D"font-family:arial,sans-serif;font-size:small">The advantage=
of running at this cooler temperature is that the system seems to have a l=
arger "reserve" when the above traffic problems occur.</div><div =
class=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-size:sma=
ll">I found that the indicated temperature (which is accurate), runs 5 degr=
ees C=C2=A0 higher even when using a 165 degree bellows or wax pellet type =
thermostat. I suspect this is due to the slight restriction even when the t=
hermostat is fully open.</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,sans-serif;font-size:small"><br></div><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,sans-serif;font-size:small"></div><div class=
=3D"gmail_default" style=3D"font-family:arial,sans-serif;font-size:small">M=
<br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Sat, Dec 28, 2024 at 8:32=E2=80=AFAM Michael Oritt <<a href=
=3D"mailto:michael.oritt@gmail.com"; target=3D"_blank">michael.oritt@gmail.c=
om</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:rgb(51,51,25=
5)">I need=C2=A0to replace my thermostat and I see a lot of negative review=
s for "Failsafe" units--sold my Moss and many others--which are d=
esigned to fail in the open mode.=C2=A0 What is the collective experience w=
ith these?</div><div class=3D"gmail_default" style=3D"color:rgb(51,51,255)"=
><br></div><div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">TIA-=
-Michael Oritt</div></div>
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ttp://autox.team.net/archive/healeys" rel=3D"noreferrer" target=3D"_blank">=
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