Multi-Displacement System: Difference between revisions

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{{Short description|Chrysler automobile technology}}

[[Chrysler]]'s '''Multi-Displacement System''' ('''MDS''') is an [[automobile]] engine [[variable displacement]] technology. It debuted in 20042005 on the 5.7 L [[Chrysler Hemi engine#Third generation: 2003-present|modern Hemi]] [[V8 engine|V8]]. Like [[Mercedes-Benz]]'s [[Active Cylinder Control]], [[General Motors Corporation|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,closed 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'sSUVs 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).

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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 engine|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:

* 2005-2005–2023 [[Chrysler 300#2005 300/300C|Chrysler 300C]]

* 2005-2005–2008 [[Dodge ChargerMagnum#Chrysler (LX platform (2005–2008)|Dodge ChargerMagnum]]

* 2005-2005–Present [[Jeep Grand Cherokee]]

* 2005- [[Dodge Magnum]]

* 2006–2023 [[Dodge Charger (LX)|Dodge Charger]]

* 2005- [[Jeep Grand Cherokee]]

* 20062006–2009, 2011-Present [[Dodge Durango]]

* 2006-2006–Present [[Ram pickup|Dodge Ram/Ram pickup]] (1500 only)

* 2006-2006–2010 [[Jeep Commander (XK)|Jeep Commander]]

* 2007-2007–2009 [[Chrysler Aspen]]

* 2009-2009–2023 [[Dodge Challenger#Third generation (2008–present)|Dodge Challenger]]

* 2021-Present [[Jeep Wrangler (JL)|Jeep Wrangler Rubicon 392]]

* 2022-Present [[Jeep Wagoneer (WS)|Jeep Wagoneer]]

==See also==

* [[Variable displacement]]

* [[Honda]]'s [[Variable Cylinder Management]] (VCM)

* [[General Motors Corporation|General Motors]]' [[Active Fuel Management]] (AFM)

* [[Daimler AG]]'s [[Active Cylinder Control]] (ACC)

* [[Displacement on Demand]]

* [[General Motors Corporation|General Motors]]' [[Active Fuel Management]] (AFM)

* [[Honda]]'s [[Variable Cylinder Management]] (VCM)

* [[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]]