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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Today's Featured Article - The Cletrac General GG and the BF Avery A - A Bit of History - by Mike Ballash. This article is a summary of what I have gathered up from various sources on the Gletrac General GG and the B. F. Avery model A tractors. I am quite sure that most of it is accurate. The General GG was made by the Cleveland Tractor Company (Cletrac) of Cleveland, Ohio. Originally the company was called the Cleveland Motor Plow Company which began in 1912, then the Cleveland Tractor Company (1917) and finally Cletrac.
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