This bears the same name as an engine in my "running" model gallery, but is larger, and is much more authentic. Note the "tower" for water cooling. This is a four cycle engine and is fairly large, with a 16 inch flywheel. The odd part about the Atkinson 'cycle' engine, all 4 strokes occur with one revolution of the crankshaft. (see the 3 photos which follow) Bill Tester of Snohomish, WA owns this running model. The castings were discontinued several years ago.