How does the MDS Hemi work?
How does the MDS Hemi work?
The MDS solenoids direct oil pressure to the lifters for each cylinder and that pressure pushes in locking pins that allow the lifters to ‘collapse’, so they no longer open the valves. The ECU also shuts off fuel and spark to the cylinders.
What does MDS stand for engine?
Multiple Displacement System
In the case of the Chrysler/FCA third-generation Hemi, the system is called Multiple Displacement System, or MDS for short. The LS engine family from GM uses a similar technology called Active Fuel Management (AFM).
What kind of exhaust system does a Chrysler MDs have?
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.
Are there any Dodge Rams that have MDS?
In 2005, it was available in the Chrysler 300C, Dodge Charger, Dodge Magnum and Jeep Grand Cherokee. In 2006, it was equipped in the Dodge Durango, Dodge Ram 1500 and Jeep Commander. However, the MDS will not be available in cars with manual transmissions.
How does the MDS work on a Jeep Cherokee?
At low power, the MDS only activated four cylinders. When more power was needed, the V-8 mode was activated. According to Chrysler, this resulted into fuel economy with up to 20 percent more efficiency. This system also resulted in fewer parts for the engine, thus lowering costs.
Are there any Hemi engines that have MDS?
As of December 2010, the Car and Driver website says the 6.4L Hemi V-8 engine with MDS will be available in the 2011 Dodge Challenger SRT8, as well as the other upcoming SRT V-8 models.
What kind of oil does a Chrysler MDS use?
This has worked with Chrysler vehicles since the early 90s. One thing about the Chrysler MDS system is that it’s very important to use the correct weight of oil, as the system is oil-operated. I think your vehicle calls for 5W-20 oil. If you have been using anything heavier, especially if it’s getting cold where you live, this can cause problems.
How does MDS work on a Dodge Charger?
This system is used in a variety of models including the Dodge Ram, Charger and Chrysler 300. Although the system saves fuel, it creates response lag as the engine reactivates the deactivated bank, which can be irritating to a performance enthusiast.
At low power, the MDS only activated four cylinders. When more power was needed, the V-8 mode was activated. According to Chrysler, this resulted into fuel economy with up to 20 percent more efficiency. This system also resulted in fewer parts for the engine, thus lowering costs.
How long does it take to deactivate four cylinders on a Chrysler 300?
DaimlerChrysler engineers state that the system can deactivate four cylinders within 40 milliseconds (0.040 second). Both the intake and exhaust lifters for each cylinder are deactivated. Every other cylinder is deactivated so the transition from eight to four and four to eight cylinders is seamless.
