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I tried constructing my real engine and was fairly successful. I entered the stroke and bore, picked all of the factory materials, toyed with the cams and timing until I had it pretty damn near the real output - though it was actually a little shy of what I wanted.
It gives efficiency numbers and emmisions but they're rounded so you cant see really fine-grained changes.
My conclusion was that, given the bore and stroke and the limits of the program, I couldnt eek out one more horsepower or drop fuel consumption by a measurable amount over how it came tuned from the factory without causing knock or some kind of failure; Honda did a fine job considering the limits of the technology used.
For funsies I threw vvl amd vvt on my block to see what kinds of gains are acheivable with newer technology, and saw a 20% increase in maximum horsepower (peak torque did not change) with a potential fuel use reduction of 40%, after tweaking timing and cam profiles again.
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