US PATENT SUBCLASS 123 / 269
.~ Piston shape complements precombustion chamber discharge

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123 /   HD   INTERNAL-COMBUSTION ENGINES

253  DF  PRECOMBUSTION AND MAIN COMBUSTION CHAMBERS IN SERIES {22}
269.~ Piston shape complements precombustion chamber discharge

DEFINITION

Classification: 123/269

Piston shape complements precombustion chamber discharge:

(under subclass 253) Subject matter in which an engine piston is shaped to conform to the shape or direction of the discharge from the prechamber outlet and allows free flow

therefrom.

(1) Note. The piston may also be further shaped to direct the flow from the prechamber to a particular part of the main combustion chamber.