The featured gas engines for the Midwest Old Threshers Reunion in Mount Pleasant, Iowa, for 2023 are inverted engines. What is an inverted engine? The Merriam-Webster dictionary defines an inverted engine as “an engine whose crankshaft is above the cylinder.” It also could be described as an engine that sits on its head. An inverted engine is an upside-down version of the common vertical engine style seen at shows.
Inverted engine designs date back to the
