The Largest Single Cylinder Engine in the world- 175 Otto at Coolspring 

This gargantuan single cylinder engine is the largest known in the world, with a 21 inch bore x 30 inch stroke (displacing approximately 170 liters!). The information and introduction is given by Terry Smith, a longstanding member and tourguide of the Coolspring Power Museum.
Note: this engine is owned by Coolspring Power Museum, and permission was given to record and share Terry's exceptional knowledge.