Miller is a force induced atkinson.
The atkinson came in a few cars over the years and they have(this data is being relayed from the other thread) elliptical shaft that allows for 2 strokes to be long and 2 to be short. compression and exhaust are short and intake and expansion are long(down cycles are long up cycles are short). The gain is from scavenging slightly more power from the longer expansion and losing less power on a shorter compression and exhaust.
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