Originally Posted by magram

The system was designed around what is called a "lost motion device." DaimlerChrysler engineers designed the Hemi with a separate oil circuit controlled by four solenoids that apply oil pressure to eight specially configured hydraulic roller lifters. When the computer decides to deactivate the cylinders, the solenoids are electronically engaged and oil pressure is sent to the lifters via a separate oil passage in the block that pushes on a small pin that allows the internal piston in the hydraulic lifter to disengage from the lifter. The lifter body still rises and falls with the cam lobe, but the piston that is linked to the pushrod remains stationary. 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. We've driven both the new Dodge Magnum and the Chrysler 300-C, and it is impossible to tell when the engine is running on four cylinders and when it doubles back to eight

Originally Posted by own1bigtruck

and think of how much brake power you would gain, not to mention how cool it would sound through str8 pipes! Im all for a real jake brake!!