Hercules Engine News

Including Economy, Arco, Jaeger & Thermoil


| September/October 1993



Model N HP Engine

20601 Old State Road Haubstadt, Indiana 47639

During 1923 another new one piece block engine was introduced. It was a reduced size 1 HP engine designated the model N. It had a 31/4 inch bore and a 4 inch stroke. It was more of a departure from the normal Hercules design than the larger one piece block engine discussed in the previous article.

The 1 Model N was about 75 pounds lighter and sold for about 10 dollars less than the standard l HP engines of the time. The water hopper was smaller, there was no cast iron bottom in the crank area and the flywheels were only 16 inches in diameter. Its only grease cup was on the connecting rod bearing. The rear end of the side rod was supported by a rocker arm because there was no regular governor bracket.

Although identical, they were produced as both Hercules and Economy brands with the latter being the most common. Production lasted less than two years with a total of some 5000 being produced. Serial numbers fall into the 311,000 to 323,000 range. Twenty-two are currently known.

During their short production run, several changes were made. Originally the fuel mixer was cast as part of the head, but it was later changed to the screw on 'J' type with a choke flap being a variable. In the beginning the detachable 11/4 inch hand crank was used, but it was later changed to the handle being built into the flywheel. There were also changes in the single flywheel governor weight and the detent arm. There were also three different fuel spout arrangements.

The normal muffler consisted of a small metal plate in the exhaust opening on the offside of the head. A special adapter was available so the standard small Hercules cone type muffler could be added. So far, only one of these has been observed.