Multi-Displacement System
Chrysler'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' Active Fuel Management, and Honda's Variable Cylinder Management, it deactivates four of the V8's cylinders when the throttle is not excessivly used, or at steady speeds, or at certain rpms, or when all eight cylinders are used.
The system was first offered only on passenger cars, since the heavy demands of trucks would interfere with its operation. However, it was recalibrated for 2006 and was offered on all seven models, including SUV's and 1500 series trucks, using the 5.7 L engine.
Chrysler expected that the technology would 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 four-cylinder mode. Unlike the system used on Mercedes-Benz V12 engines, also designed by Eberspaecher, the system is mechanically passive.
It is on the 5.7 HEMI unless its manual or in manual mode with autostick, the 6.4 HEMI, and is on every trim of charger and challenger besides the hellcat and demon. It's on every HEMI in auto configuration with the exceptions of the HELLCAT 6.2 2.3 litre supercharger 16 valve HEMI V8, and the DEMON 6.2 2.9 litre supercharger 16 valve v8 Applications:
- 2005- Chrysler 300C
- 2005- Dodge Charger
- 2005- Dodge Magnum
- 2005- Jeep Grand Cherokee
- 2006- Dodge Durango
- 2006- Dodge Ram (1500 only)
- 2006- Jeep Commander
- 2007- Chrysler Aspen
- 2009- Dodge Challenger
See also
- Variable displacement
- Honda's Variable Cylinder Management (VCM)
- General Motors' Active Fuel Management (AFM)
- Daimler AG's Active Cylinder Control (ACC)
- Displacement on Demand