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S50 and S52 crank both have 91mm stroke. one has slightly larger bore. you can make E36 325 engine into M3 engine (almost same displacement) merely by swaping to M3 crank and rods. both the rods on the 3.0 and 3.2 are 135mm.
325 is 84mmx74mm stroke
328 is 84mmx84mm (square)
3.0 is 86mm-91mm
3.2 is 86.5-91mm
i think those are accurate as i remember from bently manual, only one im unsure about is the 3.0 but others should be right.
M50B25 = 84 x 75mm
S50B30 = 86 x 85.8mm
S52B32 = 86.4 x 89.6mm
S50B30 crank + rods in an M50 block (stock 84mm pistons) = 2.9L
The S54 has a 91mm crank, which is what you might have been thinking of.
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