- Source: Multi-Displacement System
Chrysler's Multi-Displacement System (MDS) is an automobile engine variable displacement technology. It debuted in 2005 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 closed or at steady speeds.
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 SUVs 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.
Applications:
2005–2023 Chrysler 300C
2005–2008 Dodge Magnum
2005–Present Jeep Grand Cherokee
2006–2023 Dodge Charger
2006–2009, 2011-Present Dodge Durango
2006–Present Dodge Ram/Ram pickup (1500 only)
2006–2010 Jeep Commander
2007–2009 Chrysler Aspen
2009–2023 Dodge Challenger
2021-Present Jeep Wrangler Rubicon 392
2022-Present Jeep Wagoneer
See also
Daimler AG's Active Cylinder Control (ACC)
Displacement on Demand
General Motors' Active Fuel Management (AFM)
Honda's Variable Cylinder Management (VCM)
Variable displacement
External links
"Give Deactivation its Due" – Ward's Auto World via archive.org
"Twice-Tuned Hemi" – Ward's Auto World via archive.org
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