Dear All,
(The following is a repeat of a message I tried to circulate recently - it
appeared to go into a black cyber hole!)
The excellent Triple M Bulletin bulletin, edited by Philip Bayne-Powell, is a
fascinating and regular publication available to Triple M register members.
In the latest one I spotted a tip which may be of help to us Brits at this
time of year - fit a thermostat into the top hose. Halfords evidently sell
one that is a nice snug fit. It is their part no. HTS 610.
This set me wondering.
The Halfords thermostat is of a type which remains totally closed until the
temperature rises to 83 degrees C, whereupon it opens. It has no bleed hole
or bypass valve.
My P type has a water pump fitted, which circulates water away from the botom
of the radiator and assists its flow through the hot part of the engine until
it reaches the rad header tank. In normal conditions this allows the engine
to run cool - far too cool, I suspect - 60 degrees in Winter and not much
above 75 degrees in Summer. Blanking the bottom of the rad has helped to get
a bit of extra heat into the system, but not much!
So, if I fit a thermostat, I reckon that the water will heat up nicely, but
will have nowhere to go until the temperature reaches 83 degrees and the
thermo valve opens. So instead of being over-cooled, it's likely that the
beastie may become over-heated - es[ecialy at the back end of the cylinder
head !
What opinions do MMM folks have on this subject. And would it be any
different for cars that do not have a water pump, and simply rely on
thermo-syphoning to move the water around?
Best wishes to all.
Dick Morbey
PA 0743
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