Very well written and informative post, ScottyHOMEy
Free convection cooling (also called thermosiphon cooling) can be a very effective cooling system if well maintained. There are only three failings when compared with a forced convection system. One is that it doesn't work in the absence of gravity (not exactly a problem for a Farmall A), it requires more cooling area than a comparable pressure cooling system, and it must remain clean. A thermosiphon system relies on the relatively small change in density of a fluid with temperature. As a fluid's temperature increases, it's density decreases and it tends to rise. In a thermosiphon system, this creates a flow of coolant that continually exchanges the heated fluid with cold fluid. However, if there are scale deposits in the coolant passages, it causes a double-hit to cooling capacity. This is because scale causes a frictional loss that slows the flow rate of the coolant, and it also reduces heat transfer to the coolant, leading to less of a temperature differential and a slower flow rate of coolant. Forced convection will simply improve heat transfer because it pumps the water at a much faster flow rate.
On a side note, colder for engines is not always better. . . As long as it is in the run area of the gauge, I wouldn't worry about making it run colder.
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