Patent ID: 7025031

Claim:
A diesel engine comprising: a piston having a top wall and an annular sidewall; said top wall including an upper rim face, said top wall defining a cavity including a center portion having a partially spherical shape and a spherical radius of about 3 inches, a cone portion adjacent to said center portion and being formed at an angle of about 14 degrees, an annular toroidal surface connected to said cone portion and defined by a toroidal major diameter of about 4.822 inches and a toroidal minor radius of about 0.77 inches, a crown rim having a radius of about 0.38 inches and being adjacent to said annular toroidal surface and connected to said upper rim face of said annular sidewall, said crown rim joining the annular toroidal surface at a location having a diameter not less than about the toroidal major diameter plus two times the toroidal minor radius, said toroidal minor radius being measured from a point that is submerged about 0.496 inches below said upper rim face, said cavity having a bowl volume of about 35.185 cubic inches.