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There's something in that, I think. In the Triumph engines there are two different journal sizes (we call them large bearing and small bearing cranks, clever eh?).
Anyway, you can never get as much power out of the large bearing cranks, the current thinking (which probably is the same as it was in the 60s) is that due to the larger areas involved with the large bearing cranks the surface speeds are higher and therefore friction losses are greater. It's probably no coincidence that the large bearing cranks also have a reputation for knackering bearings.
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