Two piece cast ferrous crown piston for internal combustion engine

A piston for an internal combustion engine having a piston, rod, and a wrist pin, said piston comprising in one piece a piston crown and a conjoined piston skirt,

• said piston crown having an outer surface, a combustion chamber, and an inner surface, the piston crown being precision cast net to finished dimensions on all inner surfaces with a substantially constant thickness between said outer surface and said combustion chamber to said inner surface,
• and to all dimensions comprising the inner and outer forms of the piston wall, skirt and top, and said piston having two rod connection flanges, said rod connection flanges extending off of said inner surface of said piston crown, each said rod connection flanges having a lower end,
• each of said rod connection flanges being tapered from said inner surface of said piston crown to a reduced section at said lower end, said tapers allowing clearance for a greater contact area between the wrist pin to the piston crown at the top of said tapers and between the wrist pin to the piston rod at the lower end of said tapers, and said piston crown surrounding said two rod connections.