10What is a Boxer Engine?

History of the Boxer or Flat Engine, a Design with Punch

The flat or boxer engine pushes pistons horizontally in opposition, each connected to a single crankshaft by its own crankpin, which makes it different from V-type flat engines which may be nearly 180 degrees in separation, but share crank pins, and don't share the unique boxer motion where pistons punch out on one side and then the other in pairs. The original boxer was a two-cylinder model, but engines up to twelve cylinders have been produced. Not surprisingly Subaru's implementation of the boxer configuration in four cylinders has been highly successful in passenger vehicles.

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