# Multi-Displacement System

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{{Short description|Chrysler automobile technology}}
[Chrysler](/source/Chrysler)'s '''Multi-Displacement System''' ('''MDS''') is an [automobile](/source/automobile) engine [variable displacement](/source/variable_displacement) technology. It debuted in 2005 on the 5.7 L [modern Hemi](/source/Chrysler_Hemi_engine) [V8](/source/V8_engine). Like [Mercedes-Benz](/source/Mercedes-Benz)'s [Active Cylinder Control](/source/Active_Cylinder_Control), [General Motors](/source/General_Motors_Corporation)' [Active Fuel Management](/source/Active_Fuel_Management), and [Honda](/source/Honda)'s [Variable Cylinder Management](/source/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](/source/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](/source/Mercedes-Benz) [V12](/source/V12_engine) engines, also designed by Eberspaecher, the system is mechanically passive.

Applications:
* 2005–2023 [Chrysler 300C](/source/Chrysler_300)
* 2005–2008 [Dodge Magnum](/source/Dodge_Magnum)
* 2005–present [Jeep Grand Cherokee](/source/Jeep_Grand_Cherokee)
* 2006–2023 [Dodge Charger](/source/Dodge_Charger_(LX))
* 2006–2009, 2011–present [Dodge Durango](/source/Dodge_Durango)
* 2006–present [Dodge Ram/Ram pickup](/source/Ram_pickup) (1500 only)
* 2006–2010 [Jeep Commander](/source/Jeep_Commander_(XK))
* 2007–2009 [Chrysler Aspen](/source/Chrysler_Aspen)
* 2009–2023 [Dodge Challenger](/source/Dodge_Challenger)
* 2021–present [Jeep Wrangler Rubicon 392](/source/Jeep_Wrangler_(JL))
* 2022–present [Jeep Wagoneer](/source/Jeep_Wagoneer_(WS))

==See also==
* [Daimler AG](/source/Daimler_AG)'s [Active Cylinder Control](/source/Active_Cylinder_Control) (ACC)
* [Displacement on Demand](/source/Displacement_on_Demand)
* [General Motors](/source/General_Motors_Corporation)' [Active Fuel Management](/source/Active_Fuel_Management) (AFM)
* [Honda](/source/Honda)'s [Variable Cylinder Management](/source/Variable_Cylinder_Management) (VCM) 
* [Variable displacement](/source/Variable_displacement)

==External links==
* [https://web.archive.org/web/20040515013706/http://waw.wardsauto.com/ar/auto_give_deactivation_due_2/ "Give Deactivation its Due" – Ward's Auto World via archive.org]
* [https://web.archive.org/web/20050115105733/http://waw.wardsauto.com/ar/auto_twicetuned_hemi_2/ "Twice-Tuned Hemi" – Ward's Auto World via archive.org]

Category:Chrysler
Category:Engine technology

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Adapted from the Wikipedia article [Multi-Displacement System](https://en.wikipedia.org/wiki/Multi-Displacement_System) by Wikipedia contributors ([contributor history](https://en.wikipedia.org/wiki/Multi-Displacement_System?action=history)). Available under [Creative Commons Attribution-ShareAlike 4.0 International](https://creativecommons.org/licenses/by-sa/4.0/). Changes may have been made.