Assertion: engine's piston | /r/AtLocation | opposite directions
Facets:
value: like a boxing competitor
type: MANNER
value: at the same time
type: TEMPORAL
value: to compress the charge
type: PURPOSE
Source sentences:
text: For instance, a 4-stroke I2 engine has better balance when the angle between the crankpins is 180° because the pistons move in opposite directions and inertial forces partially cancel, but this gives an odd firing pattern where one cylinder fires
text: Yet another design uses piston-controlled ports at both ends of the cylinder and two opposed pistons in each cylinder moving in opposite directions to compress the charge between them.
text: The pistons are usually mounted on the crankshaft such that opposing pistons move back and forth in opposite directions at the same time, somewhat like a boxing competitor punching their gloves together before a fight, which has led to it being referred to as a boxer engine.