Roger Butzen, of Texas, built this Wall Wizard opposed twin engine. The engine was loaned to the Miniature Engineering Craftsmanship Museum as part of the Engine Collection of Paul and Paula Knapp. Mr. Butzen’s Wall Wizard is 11”-long, 9”-wide, 8”-high, and weighs 11 lbs.
Elmer A. Wall began designing and manufacturing casting kits for miniature internal combustion engines during the Great Depression (1929–1941), and continued until his death in 1947. Among his designs was the Wall Wizard with opposed twin pistons. Mr. Wall advertised that the engine was so well balanced that it would, “start on the first turn if machined properly,” and that it would idle down to a tick, or roar full speed when the throttle is opened. The engines were produced by Wall’s Model Engine Laboratory, Chicago, Illinois. Another Wall Wizard engine from the Knapp Collection is also on display in the museum.