Just reading some of the posts on cooling. Here's something to think about..
The temp gage should go to the temperature of the thermostat… and stay
there under ALL driving conditions. If the cooling system is doing it's job
then you should have almost constant temperature- always- racing, idle,
traffic, crusing, etc. Too cool is as bad as too hot and if something "drops
the temperature 20 degrees", then you still have a problem somewhere.
While a big temperature drop (or rise) under certain conditions sounds
like a good, normal thing- it really is not and indicates that you need to do
a bit more shadetree engineering to get it all right.
There are a lot of factors to mull over. It's not rocket science, still
the obvious "solutions" sometimes come back to bite you.
The airflow through the radiator is a big factor in Morgans. My
experience is that modern, thin core, high fin density radiators work great
in Morgans.(as they do in modern cars), combined with an electric fan and a
proper thermostat.
The fan should not cool the car down… much. It should come on before the
temperature rises any significant amount over the thermostat temperature and
the thermostat should close before the temperature drops. If you have good
airflow through the radiator and the radiator is adequate as far as
displacing heat and the thermostat is working- almost constant temperature
under all conditions. Something to strive for..
Fred Sisson
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