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I am interested to see your note on BMW - as far as I know, BMW was a pioneer in the development of unsleeved motors for cars (Chevy Vega notwithstanding) so I am thinking that makes it more likely it's an unsleeved block. Someone earlier in the thread seemed to think I was critical of a motor being unsleeved, and it's exactly the opposite. I am tickled to see the technology make it down to smaller motors, as the weight savings is even more important there.

Your writeup on torque is one of the few accurate reflections on the subject I have seen. Most people don't get that torque is just horsepower occurring at a particular RPM (T = HP * 5252 /RPM ) - they talk about motors making more torque, while the horsepower remains the same, which isn't actually possible. It's all in the shape of the curve!

Tim