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Most variable displacement systems work by turning off a bank of cylinders in a V Engine , but the initial systems worked differently. Pioneered on Cadillac 's ill-fated ''L62'' "V8-6-4" engine, the original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. But the system was troublesome, and the technology was quickly retired.

No automaker attempted the same trick again until Mercedes-Benz experimented with their Multi-Displacement System V12 in the 1990s . It was not widely deployed until the 2004 DaimlerChrysler Hemi . Other systems appeared in 2005 from GM ('' Displacement On Demand '' in the Generation IV Small-block ) and Honda ('' Variable Cylinder Management '' on the J Family engines). Honda's system works by deactivating a bank of cylinders, while the Chrysler Hemi shuts off opposing pairs.

Two issues to overcome with all of these systems is the unbalanced cooling and vibration of variable-displacement engines.


VARIABLE DISPLACEMENT TECHNOLOGIES



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