Two limiting factors in the miniaturization of gasoline engines are the size of the air and fuel molecules. George Luhrs dispelled the theory that gasoline burning, spark ignition engines can be miniaturized only so far, considering this engine is one of the largest he has built. With a bore and stroke of only 1/8 of an inch, one of his smaller four-cycle, single-cylinder gasoline engines nearly fits inside the gas tank of this engine, and his tiny works of art run magnificently. Finished in 2001, this mini single-cylinder engine is 6″-long, 3″-wide, and 6″-high.
George is a master at micro engineering, machining and finishing and has produced a five-cylinder, four-cycle, spark ignition radial engine that fits inside a coffee cup. He has won many awards for his efforts.