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Good question - I'm not sure.

I suppose that explains why they say they're only using Atkinson "at idle," according to the Nissan diagram. I wonder if it's meant to reduce idle fuel consumption or just improve idle smoothness. ...

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The 1.6L engine in the Micra uses continuously variable (within a set range) valve timing on the intake & exhaust camshafts / valves. (Information source)

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Above: at idle, the system...