![]() High oil pressure is applied to the special lifters and the lifters become inactive and essentially the four pistons are along for the ride. They are working normally in this mode.Ĥ-cylinder mode: Solenoids are in the "on" state (energized). Minimal oil pressure is applied to the special lifter. The camshaft can move the outer portion of the lifter without transferring motion to the inner portion of the lifter.Ĩ-cylinder mode: Solenoids are in the "off" state (de-energized). This unlocks the outer portion of the lifter and allows it to move independently from the center portion of the lifter. When the special lifters are supplied high oil pressure by the solenoid, pins inside the lifter move inward. When the solenoids are activated, oil pressure of 16 psi or greater is supplied to the lifters and the engine enters the 4-cylinder mode. This lifter oil keeps the bores lubricated and prevents air from entering the system. When the MDS solenoids are in the "off" state (8-cylinder mode), they supply oil pressure of approximately 3 psi to the lifter bores. ![]() The PCM also deactivates the fuel injectors for these cylinders when in the 4-cylinder mode. ![]() ![]() There is one solenoid for each cylinder (two lifters). 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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