a month this has another key question especially for those who are interested in the technology behind it out as cylinder deactivation actually work he opens the hood illustrate. it here are four cylinders one two three four five to be utter cylinders are always the first to be deactivated those are one in four but that doesn't mean they're uncoupled from the crankshaft and brought to a complete standstill if they keep pumping but the valves remain closed. and she won ninety four engine the valves are not actuated by the camshaft pushing on them directly instead the camshaft moves a rocker arm connected to the valves the joint at the rocker arms other end can be disengaged by removing a little bend so the camshaft action no longer opens the valve this system only comes into play when the driver doesn't need much power when the driver accelerates rapidly the engine in mediately activates all four cylinders the other is inside