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COMMENT: Removing the final mechanical barrier

BY ROGER STONE. High speed digital control has improved almost every aspect of vehicle performance. But while many systems are now mature to a point where they are becoming increasingly synergistic, one major area of powertrain control remains firmly constrained by mechanical drives: the valve gear that controls engine breathing.

High speed digital control has improved almost every aspect of vehicle performance. But while many systems are now mature to a point where they are becoming increasingly synergistic, one major area of powertrain control remains firmly constrained by mechanical drives: the valve gear that controls engine breathing.

The connection between an

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