When the engine was stopped, the spool valve was put into an intermediate locking position on the intake side by spring power, and maximum advance state on the exhaust side, to prepare for the next activation.
To enhance torque at engine speeds below 1800 rpm, the nozzle vanes would close to narrow the air path and increase the speed of the air flow.
Furthermore, the water jacket could be extended near the combustion chamber to enhance cooling performance.
The mass air flow meter also had a built-in intake air temperature sensor.
The four valves per cylinder — two intake and two exhaust — were actuated by roller rocker arms which had built-in needle bearings that reduced the friction that occurred between the camshafts and the roller rocker arms which actuated the valves.
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