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Very interesting thread.
Does it work?
Dunno. I'm not nearly smart enough to know.
Here's what I do know.
This guy is long on claims and sort on demonstrated proof.
It is a very simple concept and I am certain that car makers have played with it. it is much simpler and cheaper than mechanical valve deactivation, but none have brought it to market. My guess is they have found out that either it doesn't save fuel, won't pass emissions or eats cats. The last few posts in this thread mention that vw may have changed this. We shall see.
As for comparing it to limp home mode as GM introduced with the northstar V-8 quite a few years back, I am not sure this is a valid comparison. Remember the purpose of that system was to get you home in the event of a cooling system failure, not to save fuel. I would assume that such a system would run in a rich condition to assist in keeping things from melting down.
Personally, I like the idea. I hope it does work. DCD does work, but it complicates an engine quite a bit. And I abhor complication, unless it provides a considerable return.
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