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      02-21-2014, 10:07 PM   #11

Drives: 2008 E92 M3 M-DCT & 2017 440GC
Join Date: Dec 2006
Location: Mission Viejo, CA

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Originally Posted by Rupes View Post
GM seems to really understand this technology, but no other manufacturer seems to be using it on a regular basis. Why not? It seems top be a really easy, cost effective way to have a fire breathing V8, and a fuel sipper on the highway at the same time. Does anyone know why this is hard to mimic, does it have something to do with the push-rod engine?
These systems are still being used on vehicles today. These are some of the late model systems:
Chrysler = Multi-Displacement System (MDS)
Dodge = Displacement On Demand (DOD)
GM = Active Fuel Management (AFM)
Honda = Variable Cylinder Management (VCM)
Daimler AG = Active Cylinder Control (ACC)

Introduced 2005 T- truck, Envoy, Trailblazer 5.3L V8 RPO LH6, 2005 grand Prix 5.3L
More engines added in 2006, (Monte Carlo, Impalla) 2007 SUVís added, 150,000 produced in 2005, Over 2 million by 2008

Introduced in 2004 on the 5.7L Hemi
2005 on 300C, Magnum, Grand Cherokee
2006 Durango, Ram, Commander
2007 Aspen
2009 Challenger

The engine management system monitors the following on GM vehicles to allow activation:
Transmission in 3rd,4th,5th or 6th gear
Engine oil pressure between 25-75 PSI
Engine Speed 900-3000 RPM
Engine oil temp between 20-150c (68-302f)
Engine load steady
Battery voltage 11-18 volts

The GM and Chrysler versions deactivate the exhaust valves using a special valve lifter on specific cylinders.