In the case of the Chrysler/FCA third-generation Hemi, the system is called Multiple Displacement System, or MDS for short. The LS engine family from GM uses a similar technology called Active Fuel ...
Since 2005, the Gen III HEMI engine (which, fun fact, aren't actually hemis) has sported a feature called MDS, standing for Multi Displacement System, the first of its kind in its respective vehicle ...