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Symmetry is naturally occuring and inexplicably pleasing to the human eye, but it's not always the best choice for optimum mechanical engineering. Take the simple yet deceptively advanced 249.6cc single-cylinder engine found in Honda's CBR250R, which was recently adapted for use in their new dual-purpose CRF250L motorcycle.
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The mill has plenty of original design elements and incorporates no fewer than 9 new patents, but one simple way it runs more efficiently is the how the crankshaft spatially relates to the cylinder. Rather than positioning the crankshaft direclty beneath the center of the cylinder walls, in this implementation it's offset by 5mm, as seen on the right side of this diagram:
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The internal dynamics result in reduced resistance between the piston and cylinder wall during the expansion stroke due to combustion pressure, which ultimately makes for a better balanced, longer wearing engine.
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So with all due respect to Subaru's Symmetrical All-Wheel Drive and all manner of marketing-related variations on that theme, sometimes just a tad of asymmetry is exactly what the engineer ordered.?
Source: http://www.popularmechanics.com/cars/news/auto-blog/honda-designs-asymmetrical-engine?src=rss
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