Thanks folks..
SPL - To answer your question about Displacement - Displacement calculations are done irrespective of camshaft profile / valve timing - even though effective displacement can be impacted by radical profiles such as the Atkinson / Miller design.
If you think about the displacement of an engine that is supercharged or Turbo-Charged, you'd know that the actual displacement changes with RPM as the power adder forces more and more air into the engine.
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The formula for calculating displacement for one cylinder is:
Cubic Inches = Bore x Bore x Stroke x 0.7854
(Cubic Inches, convert from liters to CI by multiplying by 61.02, ex. 2.0 liters * 61.02 = 122 CI)
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I hope this helps!
