Patent ID: 8528514

Claim:
A modified piston for a reciprocating engine, the piston having a piston face: wherein the piston face comprises a plurality of radially-oriented grooves; wherein each groove comprises a distal end that is proximate to but terminate short of a periphery of the piston face and a proximal end that is proximate to but terminate short of a center of the piston face; wherein a width of the distal end of each groove is greater than a width of the proximal end of the groove; wherein a depth of the distal end of each groove is greater than a depth of the proximal end of the groove; and wherein the proximal end of each groove terminates in a point; and wherein each groove comprises two flat inner walls that come together to form a sharp angle at a bottom edge of the groove, the bottom edge extending from the distal end of the groove to the proximal end of the groove and being centered along a bottom of the groove, the bottom edge defining a first angle between the two flat inner walls, the first angle extending from the distal end of the groove to the proximal end of the groove.