Re Cooling Back of Engine


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Posted by Bob Bidonde on Jul. 04, 2009 at 10:05:04

In Reply to: Engine pans
posted by Dick Brussee on Jul. 02, 2009 at 04:29:13

The reason Cylinders 3 % 4 run hotter is because most of the coolant flow bypasses these cylinders. It's basic fluid mechanics. That is, flow through the cylinder block goes from the water inlet to the pump in the least distance possible (path of least resistance).

The cooling system in the Model A is not one of Ford's brighter ideas. The pump is in the wrong place, so it lacks a gravity head. The result is poor circulation and cavitation (foaming of the coolant).

As for vapor lock, it takes extraordinary heat to vaporize the gasoline in the lines, and I suspect it has more to do with driving in hot climates.

A simple solution to cars prone to vapor lock is to add another fuel that has a higher vaporization temperature such as diesel fuel. This raises the heat of vaporization of gasoline.

I guess that the principal value of the engine pans is to create a flow stream beneficial to the transmission. On the negative side, the pans are poorly designed (too stiff up front)and crack. Moreover the pans direct gasoline drippage from the carburetor right to a hot exhaust pipe.




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