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Honda seems to be saying that compression and down stroke balance each other out in deactivated cylinders, but I believe each is a resistance, unless... the valves are deactivated at BDC with a full cylinder of air. In that case, spring back from the fully compressed cylinder might assist in powering compression in the fully expanded cylinder.
It may even help if the deactivated cylinders are closed halfway through the intake stroke.
only half the air to compress or expand.
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