See All 10 Photos The lifter valley of a stock 5.7L Hemi without MDS. Notice the two white plugs next to the cam tunnel? These are where the MDS solenoids would normally go. Truck engines like ...

Each MDS lifter deactivates with precise timing ... The best way to minimize the chances of HEMI engine lifter failure and the dreaded tick is to minimize the amount of time it's left idling ...

The MDS has been used on various Hemi engines since 2005 ... dirty oil that causes lifter rollers to make contact with camshaft lobes, and dropped valve seats due to temperature drop in ...

They explain that while a V8 HEMI cruising down the highway with four deactivated cylinders is more efficient, the possibility of a failed MDS lifter due to oil contamination often makes the ...

A valve lifter is an engine component that rides ... Though not familiar with the Hemi's MDS, Randolph says he doesn't think the cylinder deactivation system is playing a role based on what ...

The Hemi MDS is available in four vehicles ... The system deactivates the valve lifters. This keeps the valves in four cylinders closed, and there is no combustion. Also, energy is not lost ...

In addition to the fancy fuel injection, the modern Hemi can be blessed with Multiple Displacement Systems (MDS), Variable Camshaft ... don’t have to remove the lifters to perform a cam swap.

Bought my 2013 Ram 1500 Express regular cab 4X4 with 5.7 Hemi new in 2013 and it now has 207,500 miles! I did replace a lifter and cam ... eliminate VVT and MDS, headers, Hi flow oil pump, etc ...

Q: I own a 2012 Jeep Grand Cherokee with a 5.7-liter Hemi engine ... Oil pressure controlled by the MDS solenoids is utilized to deactivate the hydraulic lifters for those cylinders.