Step changes in engine output over the years has meant that both mean effective pressure (MEP) and maximum cylinder pressures have risen in proportion. In the late 1980s/early 1990s MEP was around 15-16 bar and maximum firing pressures were approximately 130 bar; today pressures for the latest generation of two-stroke crosshead engines are 18-20 bar MEP, with maximum cylinder pressures as high as 155 bar.
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机译：多年来，发动机输出的阶跃变化意味着平均有效压力（MEP）和最大气缸压力均按比例增加。在1980年代末/ 1990年代初，MEP约为15-16 bar，最大燃烧压力约为130 bar。今天，最新一代的二冲程十字头发动机的压力为18-20 bar MEP，最大气缸压力高达155 bar。
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