NYT article - GM cylinder dropping

[Jason Haines]

I think the system GM will be using for cylinder deactivation is actually an
Eaton system. They had it on display at the SAE show a couple of years ago.


Jason


>
> -> "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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