In otherwords, a shorter stroke. The rod length is an after-thought. If the actual rod length was what was doing it, all racing pistons would be 1/2" thick with longer rods. That's an interesting theory though. It goes against what I've been taught, unless you add a governor to keep the rpm in the torque range. Otherwise, a shorter stroke will actually take the engine out of the torque range faster.
Take care
~Chris
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