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We really only want the top ring to seal against the cylinder wall primarily on the power stroke ; on the other three strokes, it's just along for the ride.
The result is that a portion of the following power stroke is wasted, trying to burn already deoxygenated exhaust.
Deactivation requires only 40 or so milliseconds and is timed to occur immediately after the power stroke so the disabled cylinder remains filled with exhaust gas.
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