Exhaust system for three cylinder two-cycle engines

A three-cylinder, in-line, two-cycle loop charged engine comprising:

• (A) a die cast cylinder block having three horizontal cylinders arranged in a vertical bank, a head face at one end of said cylinders, an exhaust face on one side of said cylinders, and a bottom face below said cylinders, said cylinder block further including:
• (1) three vertically spaced transfer passages in communication with said cylinder on the same side of said bank as said exhaust face,
• (2) three vertically spaced exhaust ports in communication with said cylinders on said exhaust face of said block with said exhaust ports located adjacent the ends of said transfer passages nearest to said head face, and
• (3) an exhaust cavity in communication with said exhaust ports, said cavity having a vertically extending trunk open on said exhaust face of said block and a centrally located manifold opening through said head face of said block, and
• (B) a die cast exhaust manifold cover attached directly to said block on said exhaust face to form with said exhaust cavity an exhaust manifold having substantially equal length acoustical paths between said opening and each of said exhaust ports and substantially equal acoustical distance between any two of said exhaust ports.