Sprue for a lost foam casting system for biasing a directional fill rate from a bottom portion of a metal casting

A sprue for a lost foam casting process, comprising:

• a longitudinally extending first member made of evaporative material, said first member having an upper receiving end for receiving molten metal, and a lower outlet end;
• a longitudinally extending second member made of evaporative material, said second member having a lower inlet end;
• a connection member made of evaporative material and laterally connected between said outlet end of said first member and said inlet end of said second member,
• said second member being attachable through at least one laterally extending in-gate to a pattern of an object to be cast from said molten metal, said pattern being made of evaporative material,
• whereby said molten metal is directed to flow from said upper receiving end of said first member of said sprue longitudinally downwardly through said first member of said sprue to said lower outlet end of said first member of said sprue then laterally through said connection member of said sprue to said lower inlet end of said second member of said sprue then longitudinally upwardly through said second member of said sprue to said in-gate then laterally through said in-gate to said pattern of said object to be cast.