Bob M is correct, the hot position diverts the exhaust gasses around the inlet manifold to keep it hot, stopping the distillate/kerosene from condensing in the manifold. In the cold position the exhaust gasses go straight up the exhaust pipe. Both my Super A and W-4 manifolds need to have the valve freed up but other than that, both are in very good condition. The one on the O-12, (gasoline, but 60 octane in the 1930s) was new 10 years ago, works very well but running cold all the time on 95 octane, the lowest octane available now. I would like to find the chimney casting that connects the manifold to the muffler for the Super A. Some years ago OEM had them in their catalogue but not any more.
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Today's Featured Article - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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