Originally Posted by wrench459
Questions
1 how much of the load is spread where on the rod?
2 Where does the rotating mass separate from the reciprocating on the rod?
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Actually it's very easy to visualize. The rod and cap are always close to centered on the rod journal, so the loading is real close to rod centerline either on the upper shell or the lower shell. It depends on what the piston stroke is. The rod is pushing down on the journal or it's being pushed or pulled on the journal.
I'm not sure if there is a definitive area where the reciprocating mass ends and the rotational mass begins. Maybe someone with more expertise can assist you there.