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"When the engine is cool, the water is recirculated. This means the warm water leaving the manifold is mixed back into the input of the water pump. As a result the 'cooling water' is now not so cold and doesn't cool as much.
As that water gets warmer, the thermostat sends less warm water into the recirculation loop and so the water entering the cooling system is colder."
Yes. That is my understanding of the early cooling system that has the after market Dole T-state added.
"I've heard rumors of systems that had a ball valve instead of a thermostat."
Not just rumors. That is how my boat, with 1965 A-4, is set up.
"I am guessing that to add that to my system, I would need to restore the recirculation loop and add the ball valve in the recirculating portion?" Yes. Just make sure you have descent access to the valve.
"The other question is -- how much does this matter?" That is a point of debate. I think most will agree that a engine running at "proper" temp is best.
I use my boat in all seasons, water temps, conditions and durations and have posted my thoughts on why this system works so well for me.
Dan S/V Marian Claire
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