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Rod 1 is fed from 1st main bearing. Rod 4 is fed from 5th main bearing. Rods 2 and 3 are both fed from 3rd main bearing. It will always be 2 or 3 rod that fails first as they have to share oil.
Just guessing... Maybe the angled rod cap has something to do with it? The angle is different relative to rotation on 2 and 3 rods. When the oil disappears, maybe one orientation is more survivable than the other.
On a regular inline crank it is common for each rod to have its own feed from a main bearing, no sharing.
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