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Interesting, they're closing the intake valve early on the intake stroke vs leaving it open longer on the compression stroke. It seems like the Atkinson cycle would still be superior for efficiency purposes as it would reduce pumping losses more than the Budack cycle. However, there isn't air/fuel going back out the intake valve which is a nice thing. Overall I bet the differences between the two are negligible. Therefore it probably comes down to whatever is easier/cheaper to manufacture.
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