Yep - it's called the MDS system. All the cars that have the Hemi (Magnum,
Charger, 300C) have this in place. I thought I heard it was going to be
added to the Rams and Durangos for the '06 models. Essentially, it's a
lifter that can disconnect itself, preventing the cam from actuating the
valves. Obviously, the fuel injector is also shut down, though the spark
plugs continue to fire (due to the Hemi's "one coil fires two spark plugs"
arrangement). Four of the eight cylinders deactivate - the same four
cylinders all the time. This seems counter-intuitive, but Chrysler claims
they have detected no adverse wear patterns on the non-deactivated
cylinders. Time will tell, I guess...
More than you'd ever want to know about the Hemi can be found, in part,
more reliable, powerful and technologically superior to the engines of even
10 years ago. Oil is the life beat of any engine proper type is imperative
and you really need to be anal on changing the oil too. There are some draw
backs with technology on today's engines they are costlier to maintain
however, if properly maintained on the average provide far better service
life that the older engines of 20 years ago.
I know some will argue and before you do contact Pat Goss at
http://www.patgosscarworld.com/ probably the fore most expert in the
automotive field he will set you strait. The man knows everything about
almost every vehicle and manufacturer. He has never been wrong in all the
years I have been listening to him both on the radio and on Motor Week. I
know this looks like an advertisement but the truth is I just which I knew
what the man has forgotten.
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