#automobile_engine  the engine that propels an automobile
  supertype:  #engine  motor that converts thermal energy to mechanical work
  part of:  #car
  part:  #exhaust_system__exhaustsystem__exhaust  system consisting of the parts of an engine through which burned gases or steam are discharged
     part:  #exhaust_manifold__exhaustmanifold  a manifold that receives exhaust gases from the cylinders and conducts them to the exhaust pipe
     part:  #exhaust_pipe__exhaustpipe  a pipe through which burned gases travel from the exhaust manifold to the muffler
     part:  #exhaust_valve__exhaustvalve  a valve through which burned gases from a cylinder escape into the exhaust manifold
     part:  #silencer.acoustic_device__muffler  a tubular acoustic device inserted in the exhaust system that is designed to reduce noise
     part:  #tailpipe  a pipe carrying fumes from the muffler to the rear of a car

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