I don't know the technical answer for this either but it is worth
commenting that a thermostat is engineered into a car's motor for a
few reasons which include that there is a point of thermal
efficiency - a temp at which the engine will get the best fuel
economy and live the longest in regards to valve condition, piston
ring longevity and oil properties, and also particularly in regards
to the valve seats, those hot exhaust valves need to seat on an area
that is going to draw heat from the valve but not so cold as to
crack from cold water internal in the block and heat transferred
from the valve. You will find at your local parts house today that
most of the availability of optional temp. thermostats is gone and
only the factory specified temperature is stocked.
That last point is important to remember to dispel the back yard
mechanic's logic that if an engine is running hot it would be a good
idea to run without a thermostat. NEVER run without a thermostat as
you are risking cracking the valve seats. This is particularly
critical in flathead engines and also true in overheads.
Wayne
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