There are two main ingredients to common rail fuel injection, one being the freedom to choose injection pressure and timing totally independently of the engine load. The other is computerized control, which makes it possible to consider several engine parameters and optimize the injection and combustion in each load situation. The Wärtsilä Common Rail development was kicked off for both medium-speed engines and low-speed engines at a seminar in June 1997. This year both medium-speed engines and low-speed engines will enter commercial service. The Wärtsilä Common Rail concept for four-stroke engines comprises: Camshaft driven high-pressure pumps…