An astonishing 30% reduction in fuel consumption and in consequent emissions is claimed for a variable-compression engine concept developed by Saab Automobile AB, revealed at last week's Geneva motor show. A unique hydro-mechanical cylinder-head adjustment system — combined with high-pressure supercharging — permits calculated downsizing of the engine, so that it must generally work at close to full capacity and thus maximum thermal efficiency. Also, the design is enhanced by low pumping ...
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