Magnum V8-5.7L VIN H (2005)
Multi Displacement System Solenoid: Description and Operation
SOLENOID-MDS
DESCRIPTION
The Multi Displacement System selectively deactivates cylinders 1,4,6, and 7, to improve fuel economy. It has two modes of operation:
^
8 cylinders for acceleration and heavy loads.
^
4 cylinders for cruising and city traffic.
The main components of the Multi Displacement System are
^
Unique MDS camshaft.
^
Deactivating roller tappets.
^
4 control valves/solenoids.
^
control valve/solenoid wiring harness.
^
oil temp sensor.
OPERATION
Cylinder Deactivation
^
Trap an exhaust charge
^
Normal combustion event
^
Don't open exhaust valve
^
Don't open intake valve
^
Piston is an air spring
^
Cylinders deactivated in firing sequence
Cylinder Reactivation
^
Empty the cylinder
^
Open exhaust valve
^
Open intake valve
^
Normal combustion event
^
Cylinders reactivated in firing sequence
