Patent ID: 8276563

Claim:
An apparatus, comprising: a piston having a solid head, a skirt, a longitudinal centerline and a first end including an annular surface, said piston having a circumferential sidewall portion and a bottom wall portion defining a combustion bowl within said solid head at said first end with said annular surface extending thereround, said sidewall portion including a sharp edge at the intersection of said annular surface and a part of said sidewall portion extending substantially parallel to the centerline and a substantially rounded lip overhanging a portion of said combustion bowl and spaced axially from said sharp edge and an upwardly flared portion located between said sharp edge and said substantially rounded lip, said combustion bowl defined at said sharp edge is round and said rounded lip is closer to said centerline than said sharp edge is to said centerline, and wherein said sharp edge directs a fuel passing out of said combustion bowl away from said annular surface.