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作为标准铝活塞的替换方案,带冷却油道的单体(也叫整体)球墨铸铁活塞已经得到发展,可用于大功率柴油机上。这种活塞允许燃烧压力为3000磅/英寸~2(207巴)。由于活塞顶表面平均温度提高了180°F(100℃),所以活塞从燃烧室吸入的热量较少。要进一步减少传入冷却液的热损失,可以采用不冷却的组合活塞。根据二维有限元分析,金属顶的结构预计可减少热损失60％,陶瓷顶不会有更大的效果。
As an alternative to standard aluminum pistons, monolithic (also called monolithic) nodular cast iron pistons with cooling oil passages have been developed for use on high-powered diesel engines. This piston allows a combustion pressure of 3000 psi (207 bar). The piston sucks less heat from the combustion chamber due to a 180 ° F (100 ° C) increase in the average piston top surface temperature. To further reduce the heat loss of the incoming coolant, a non-cooled combined piston can be used. According to the two-dimensional finite element analysis, the structure of the metal roof is expected to reduce the heat loss by 60%, and the ceramic roof does not have a larger effect.