Coolspring Spotlight: Bisschop-type Sombart gas engine
Made by Sombart Mfg. Co., Hartford, CT
Horsepower 5 manpower
The Sombart gas engine, manufactured in Hartford, Conn., 1882-1884, is commonly classified as a Bisschop-type engine. “It was an early attempt by an early engine manufacturer to get around Otto’s 4-cycle patent,” Wayne Grenning says.
The engine construction is unique, with the crankshaft offset from the cylinder axis. The piston is guided with a tall, lubricated, light crosshead. The offset flywheel momentum served no typical balancing purpose, but assisted flywheel momentum by gravity on the exhaust down stroke.
Fuel consumption was excessive compared to the Otto cycle, but was not an issue with the lower powers, which ranged from 1 manpower (1/12 horsepower) to 5, the rating cast in this engine’s base.
Read more about this engine and 38 others in the new book, “Coolspring,” published by Gas Engine Magazine. It is available now, click here.