Here on CD-ROM you will get two Wall engines, both 4 cylinder gasoline, water cooled.  The first is the 50 CC racing engine, a beautiful little boat engine that has spark ignition and is a flat head design.  Second, based on the same block design and block is the same size is a 30 CC  "Mighty Mite" which is an overhead valve engine with exposed pushrods and valve rockers, it uses a slightly modified block casting and most of the parts of the two engine could be interchanged.  This opens the possibility of building either engine in either displacement.  The crankshafts,  heads, rods and pistons natrually would be main differences in the design, the blocks are the same, you need only mill of the valve ledge for the flathead valves and build it as an overhead engine.  Of course there are subtle differences in the other castings and either engines relative parts could be substituted.  This set of drawings is in pdf format larger than the original format is a 1951 magazine article on how to build a 4 cylinder 4 cycle over head valve or flathead water cooled gasoline engine in miniature.  This engine will be about 7" long and 5" high when completed.  Elmer Wall is considered to be the father of model engineering in the United States and was certainly the most prolific. The Mighty Mite and it's sister flat head Racing engine are the two best and most profound examples of Mr. Wall's designs from the late 1930's. This construction article was written by Joel Long AFTER Mr. Wall's death in 1947. His family continued the business of producing castings and parts for the engines for several more years.    There have been many of these engines built by amateur machinists and skilled professionals alike.  Many people even make their own patterns and castings. The plans are precise and easy to follow, the designs are timeless.  The article includes all pages of both designs with drawings and instructions which are easy to follow.

These articles were originally published in 1951 in what would be considered a pulp paper magazine.  It was not much better than common newsprint. The original copies and all that we have found to date are heavily Foxed or browned and the paper is usually brittle and breaks or disintegrates with handling.  We have scanned and color corrected the originals and increased the format size to 8 1/2 x 11 from the original small magazine size to make the prints easier to use.  

You may view, print, edit or even work these electronic images over to suit yourself, it is nice to be able to crop a drawing and print it full size when you are working with the drawings in your shop.   Both items are supplied on a single CD-ROM

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