DaimlerChrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2004 on the 5.7 L modern Hemi V8. Like Mercedes-Benz's Active Cylinder Control, General Motors' Displacement on Demand, and Honda's Variable Cylinder Management, it deactivates one bank of the V8's cylinders when the throttle is closed. The system was first offered only on passenger cars, since the heavy demands of trucks would interfere with its operation. Chrysler expects that the technology will boost economy by 10% to 20%. In the Jeep Grand Cherokee with MDS, highway fuel mileage for the V8 is the same as the V6 at 21 mpg (11.2 liters per 100 km).

In order to preserve the characteristic rumble of the V8 engines, Chrysler and Eberspaecher North America designed a special exhaust system for MDS-equipped vehicles. This includes four separate mufflers, two large central ones for V8 mode and two smaller ones near the tailpipes for straight-4 operation. Unlike the system used on Mercedes-Benz V12 engines, also designed by Eberspaecher, the system is mechanically passive.

Applications:

• 2004 Chrysler 300C
• 2004 Dodge Magnum
• 2005 Jeep Grand Cherokee

See also

• Variable displacement

External links

• Ward's article
• Ward's article