Different Strokes

摘要

Finding a way to reinvent the combustion engine in the face of potentially more sustainable forms of propulsion has almost become the holy grail of the automotive industry. Cylinder cut-out and variable valve timing and lift are beginning to find their way into the mainstream, while BMW has shown, with its range of four-cylinder and eight-cylinder Valvetronic engines, that it is possible for a production gasoline engine to run unthrottled with all the benefits that implies.