MM11 - The Big Rider engine

Technical details
Year of construction 2001
Power piston stroke 32 mm
  diameter 28 mm
Displacer piston stroke 30 mm
  diameter 30 mm
Flywheel  diameter 108 mm
  material caststeel
Idle speed 620 rpm
Energy source alcohol
Mass 2850g 


Before scrapping an old tape recorder (a "Tesla B57"), I removed its large, heavy flywheel including the excellent bearings. I elected to design an engine kind of "around" this flywheel.  Quickly noticing that a base made from aluminum profiles would not be sturdy enough, I built one from brazed 4 mm steel sheets instead. The cylinder mount was made from a single piece of stock. The holes were bored on the lathe and the holder was slotted. Both cylinders are secured by tightening a screw which compresses the slot. Two oblique holes inside this cylinder mount connect the cylinders.