Tunnel-style crankshaft with counterweights of increased radial profile

A crankshaft assembly comprising:

• a plurality of axially-spaced crank webs, each said web having an outer bearing support surface;
• at least one crank pin, said crank pin extending between and interconnecting two webs of said plurality;
• at least one bearing assembly forming at least a portion of a main bearing, said bearing assembly disposed around the outer bearing support surface of one of said webs interconnected by said pin;
• and
• at least one counterweight carried by said web having said at least one bearing assembly, said counterweight including a bearing retaining section that extends radially beyond said bearing support surface of said web having said at least one bearing assembly, said retaining section retaining said bearing assembly in an axial direction and said counterweight including a mass section that extends radially beyond said support surface having said bearing assembly and said mass section having a surface which overlaps at least a portion of said bearing assembly and being axially spaced from said portion of said bearing assembly overlapped.