Chrysler Stellantis North America (officially FCA US and formerly Chrysler ()) is one of the " Big Three" automobile manufacturers in the United States, headquartered in Auburn Hills, Michigan. It is the American subsidiary of the multinational automot ...

's Multi-Displacement System (MDS) is an

automobile A car or automobile is a motor vehicle with wheels. Most definitions of ''cars'' say that they run primarily on roads, seat one to eight people, have four wheels, and mainly transport people instead of goods. The year 1886 is regarded ...

engine

variable displacement Variable displacement is an automobile engine technology that allows the engine displacement to change, usually by deactivating cylinders, for improved fuel economy. The technology is primarily used in large, multi-cylinder engines. Many automobile ...

technology. It debuted in 2006 on the 5.7 L modern Hemi V8. Like

Mercedes-Benz Mercedes-Benz (), commonly referred to as Mercedes and sometimes as Benz, is a German luxury and commercial vehicle automotive brand established in 1926. Mercedes-Benz AG (a Mercedes-Benz Group subsidiary established in 2019) is headquarter ...

Active Cylinder Control Daimler AG's Active Cylinder Control (ACC) is a variable displacement technology. It debuted in 2001 on the 5.8 L V12 in the CL600 and S600. Like Chrysler's later Multi-Displacement System, General Motors' Active Fuel Management and Honda' ...

, General Motors'

Active Fuel Management Active Fuel Management (formerly known as displacement on demand (DoD)) is a trademarked name for the automobile variable displacement technology from General Motors. It allows a V6 or V8 engine to "turn off" half of the cylinders under light-l ...

, and

Honda is a Japanese public multinational conglomerate manufacturer of automobiles, motorcycles, and power equipment, headquartered in Minato, Tokyo, Japan. Honda has been the world's largest motorcycle manufacturer since 1959, reaching a producti ...

'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 The Jeep Grand Cherokee is a range of mid-size SUVs produced by the American manufacturer Jeep. At its introduction, while most SUVs were still manufactured with body-on-frame construction, the Grand Cherokee has used a unibody chassis from the ...

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

V12 engines, also designed by Eberspaecher, the system is mechanically passive. Applications: * 2005– Chrysler 300C * 2006–

Dodge Charger The Dodge Charger is a model of automobile marketed by Dodge in various forms over seven generations since 1966. The first Charger was a show car in 1964. A 1965 Charger II concept car resembled the 1966 production version. The Charger ha ...

* 2005–

Dodge Magnum The Dodge Magnum is a nameplate used by several Dodge vehicles, at different times and on various markets. The name was first applied to a large Chrysler B platform-based 2-door coupe marketed from 1978 to 1979 sold in the United States and Cana ...

* 2005–

* 2006–

Dodge Durango The Dodge Durango is a mid-size sport utility vehicle (SUV) produced by Dodge in three generations starting with the 1998 model year. The first two generations were very similar in that both were based on the Dodge Dakota and Ram Pickup, both ...

* 2006–

Dodge Ram The Ram pickup (marketed as the Dodge Ram until 2010) is a full-size pickup truck manufactured by Chrysler, Stellantis North America (formerly Chrysler Group LLC and FCA US LLC) and marketed from 2010 onwards under the Ram Trucks brand. The cur ...

(1500 only) * 2006–

Jeep Commander The Jeep Commander is an automobile nameplate used by Jeep since 2005 for several SUV models: * Jeep Commander (XK), a mid-size SUV produced from 2005 to 2010 * Jeep Commander (2022), a mid-size crossover SUV based on the Jeep Compass produced ...

* 2007– Chrysler Aspen * 2009–

Dodge Challenger The Dodge Challenger is the name of three different generations of automobiles (two of those being pony cars) produced by American automobile manufacturer Dodge. However, the first use of the Challenger name by Dodge was in 1959 for marketing ...

External links

"Give Deactivation its Due" – Ward's Auto World via archive.org

"Twice-Tuned Hemi" – Ward's Auto World via archive.org
Chrysler Engine technology

See also

External links