Re: Historical Farmall Motor Question

Posted by George 2 on April 09, 2005 at 17:31:24 from (216.46.141.114):

In Reply to: Re: Historical Farmall Motor Question posted by Jim Becker on April 09, 2005 at 17:01:15:

Bill and Jim: To complicate matters add the parent metal bore C146 and C153. To get extra displacement and 3 3/8 pistons, the sleeves were dispensed with. If you look at the old F12 and F14 engine there aren't any similarities other than the same bore and stroke. The spark plugs are also on the opposite side to the C113 / C123 / C135 / C146 / C153 as well as the other items Jim mentioned. The carburettor was downdraft type. The magneto was also old style. The evolution of the old F series into the letter series tractors as described by Guy Fay in his book "IH Experimental and Prototype Tractors" provides is an excellent reference for someone trying to trace the lineage back to the F series. One comment that can be made is that IH went through a huge design effort in the mid to late 1930's to modernize their tractors, bulldozers, and motor trucks. As can be seen from reading the book, the reason the letter series engines are so different than the F series was that inside of 5 years several generations of prototypes were designed, built and tested and then discarded in favor of even more advanced technology designs. As such the new 1939 products were state of the art in 1939. Many manufacturers did not have as technologicly advanced designs even as late as 1947. By 1948 IH designs were starting to become dated as other manufacturers caught up and surpassed IH in their technology. The live PTO by Cockshutt and later Oliver is just one example. One other interesting point made is that the Farmall H did not evolve from the F20 but instead evolved from the F12 / F14 line. The Farmall A and B were entirely new in design, and did not evolve from the F 12 even though the engine displacement is the same.

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