Chrysler Groups New HEMI MDS V8 Saves Up To 20 Percent More Fuel

While General Motors has been talking up its Displacement on Demand (DOD) system for the last year or more, Chrysler Group has been quietly working away at its own fully-functioning cylinder deactivation technology.

When the all-new 2005 Chrysler 300C and Dodge Magnum RT hit the market in the next few months, their standard HEMI V8s will feature the automakers Multi-Displacement System (MDS), the first of the type to be sold in North America on large-volume cars.

This is good news for Chrysler Group, a carmaker that hasnt exactly been at the top of the CAFE ratings in recent years due to higher than

When the 2005 Chrysler 300C hits the market in the next few months, its standard HEMI V8 will feature the automakers Multi-Displacement System. (Photo: Chrysler Group)

New developments such as high-speed electronic controls, sophisticated algorithms controlling the systems and the integration of electronic throttle control have made the technology possible. As a result Chrysler Group reports a seamless deactivation and

MDS will increase fuel economy by up to 20 percent while still delivering all the power and torque of the latest HEMI V8. (Photo: Chrysler Group)

"The Chrysler Group MDS seamlessly alternates between smooth, high fuel economy four-cylinder mode when less power is needed, and V8 mode when more power from the 5.7L HEMI engine is in demand," stated Eric Ridenour, Executive Vice President Product Development, Chrysler Group. "This optimizes fuel economy when V8 power is not needed, without sacrificing vehicle performance--2005 Chrysler 300C and Dodge Magnum RT owners will get the maximum benefit without any compromises."

And how does it

MDS deactivates the valve lifters in four of the V8s cylinders, resulting in four closed valves and zero combustion in half the cylinders. (Photo: Chrysler Group)

Chrysler rival Cadillac dabbled in a similar technology in the early 80s with dismal results. While innovative for the era, the 4-6-8 engine delivered poor reliability due to low-tech electronics. Modern technology allows trustworthy operation of this type of system. GM will offer its DOD V8 engine in a variety of multi-brand models this year as well.

But so far GM hasnt announced the availability of DOD in any of its car lines, rather focusing on optimizing truck and SUV fuel economy. Chrysler

No doubt Chrysler Groups trucks and SUVs that feature the HEMI V8 will offer the MDS at some point in the near future. (Photo: Chrysler Group)

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