NYT article - GM cylinder dropping

[Dave Williams]

-> "In the new version, an electronically controlled hydraulic system,
-> which uses ordinary engine oil, is used to alter the lifters...   The
-> lifters shorten themselves by telescoping, thus closing off the
-> valves".

 That sounds like it could be the Siemens system.  The Siemens system
uses a lifter that has a solenoid valve inside that's basically a mutant
fuel injector.  They pulsewidth-modulate the valve to alter the bleed
rate.  They were trying to market it as a VVT system - put a humongous
square cam in there and just tell the lifters to wimp it down as needed.
                                                                                                                        
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