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Antique Engine Database
Atlas-Imperial Diesel Engine Company
Atlas-Imperial diesel engines for 1926 were available in three, four, fix, and eight-cylinder models. Within twenty models, horsepower ranged from 50 to 500. The smallest sizes used a 7 1/2 x 10 1/2 inch bore and stroke – eight 13 1/2 x 18-inch cylinders were used in the 500 horsepower engine. Airless fuel injection was featured, along with a dual lubrication system. A great many Atlas-Imperial engines were adapted to electric generator service as illustrated here.
history
Built for only a short time, the Atlas-Thornburg diesels were designed by Jack Thornburg, long prominent in engineering and flying circles. Atlas-Thornburg Diesel Engines, Inc. was controlled by Atlas Imperial, with actual construction taking place in their plant at Mattoon, Illinois. Built in one, two, three, and four-cylinder units, these engines carried respective ratings of 5,10, 15, and 20 horsepower, with all sizes using a 3 1/8 x 3 3/4 inch bore and stroke. All models featured the then-popular Lanova combustion system. Diesel Progress carried a large advertisement concerning this engine in their February 1939 issue, but little more is heard of the Atlas-Thornburg engine after this time.
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