an engine that will automatically disable half of its cylinders is the latest thing in big mills.. well maybe not such a new idea ..
look at this 1977 article about the Ford Inline 300CID Dual Displacement engine .. two in one engine .. 6 cyl when required and 3 cyl when on cruise
too bad there was not enough market acceptance in 77 for this to hit mainstream then .. i sure would like that dual displacement on my 91 300CID..
the link will put you on the power curve chart . you will have to scroll up a page or 2 for the whole article
http://books.google.com/books?id=FgE...0curve&f=false