Merc-
The tire analogy was excellent. I'm usually decent at analogies, but that one was short and simple. very good.
72-
I'm not talking power, I'm talking speed. They are not the same. A shorter stroke engine will reach any rpm faster than an engine with a longer stroke, all other things being equal. Period.
You want to start talking physics? Look into piston speed. That's what regulates an engines' attainable rpm. Again, the shorter stroke wins. There's a book out there called Auto Math that explains it really well. Buy it.
Take care,
-Chris
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