#reciprocating_engine__reciprocatingengine  an internal-combustion engine in which the crankshaft is turned by pistons moving up and down in cylinders
  supertype:  #internal-combustion_engine__ICE  a heat engine in which combustion occurs inside the engine rather than in a separate furnace; heat expands a gas that either moves a piston or turns a gas turbine
  part:  #crankcase  housing for a crankshaft
  part:  #crankshaft  a rotating shaft driven by (or driving) a crank
  part:  #engine_block__cylinder_block__block  a metal casting containing the cylinders and cooling ducts of an engine; "the engine had to be replaced because the block was cracked"
     part:  #piston_chamber__cylinder  a chamber within which piston moves
        part:  #intake_valve  a valve that controls the flow of fluid through an intake
  part:  #piston__plunger  mechanical device that has a plunging or thrusting motion
     part:  #piston_ring  seal consisting of a split metal ring that seals the gap between a piston and the cylinder wall
     part:  #piston_rod  connecting rod that moves or is moved by a piston

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