When the MDS engine switches to 4-cylinder mode, the powertrain control module (PCM) controls solenoids that manage special "dual mode" lifters, allowing the intake and exhaust valves to remain closed on cylinders 1, 4, 6 and 7. This engine can deactivate four of the eight cylinders, and operate as a 4-cylinder engine during periods of low load, improving fuel economy and emissions.” "In 2005, the Multiple Displacement System (MDS) version of the 5.7L HEMI engine was introduced on the Chrysler 300C and Dodge Magnum. The MDS operation, invisible to the driver, is fully integrated into the fuel injection system. The fuel economy improvement is estimated to be up to 20 percent, depending on driving conditions. The MDS provides the 5.7L engine the fuel economy of a V6 while maintaining the performance of a V8. This engine can deactivate four of the eight cylinders, and operate as a 4-cylinder engine during periods of low load, improving fuel economy and emissions. In 2005, the Multiple Displacement System (MDS) version of the 5.7L HEMI engine was introduced on the Chrysler 300C and Dodge Magnum. How Chrysler's Multiple Displacement System Works ![]() Questions are always popping up about Eco mode, MDS, affect on the truck, when it works etc.ĭid some searching around the web and found some interesting information on MDS. Most of us really don't have an idea of how MDS works in our Hemi trucks.
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