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Originally Posted by MPGranger
about the atkinson cycle engine. I thought the big deal with it was that the connecting rods also cycled so a cylinder had a combustion event every 360 degrees of crank rotation. (Versus the 720 degrees with the otto cycle) But atkinson cycles are low on power/high on efficiency since the full compression isn't fully used.
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Atkinson is still a four cycle engine with power stroke every 720 degrees.
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and a miller cycle engine leaves the intake valves open until the combustion event so a supercharger keeps packing the cylinder. So the static compression ratio is useless here as well, and so is the dynamic (since the valve is open almost to top dead center)
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Increased static compression ratio = increased expansion ratio (regardless of intake valve timing), so static still means a lot when it comes to efficiency.