O.113 as well as for the larger types of O.115 and larger, see below.A hit-and-miss engine is a type of four-stroke internal combustion engine that was conceived in the late 19th century and was produced by various companies from the 1890s through approximately the 1940s.The flywheels maintain engine speed during engine cycles that do not produce driving mechanical forces.The flywheels store energy on the combustionstrokeandsupply the stored energy to the mechanical load on the other three strokes of the piston.Inserted into the fuel line was a check valve which kept the fuel from running back to the tank between combustion strokes.
The fuel line connected the fuel tank to the mixer.
The engine material was mainly cast iron and all significant engine parts were cast from it.
Small functional pieces were made of steel and machined to perform their function. The fuel system of a hit-and-miss engine consists of a fuel tank, fuel line, check valve and fuel mixer.
Over the years the engines were adjusted also towards higher power ratings at slightly higher speeds.
So different power specifications can be found for the same type of oil engine.