marine diesel engines classified according to air supply consist of the three following categories.turbocharged and after cooled, in which the air leaving the turbocharger, at high temperature as a result of compression, is cooled before entering the cylinders. most engines of curent design, especially the larger ones, are not only turbocharged but also after cooled.two-stroke cycle engines that are not turbocharged are incapable of drawing in air on their own, and so must be provided with some means of supplying air to the cylinders, such as under piston scavenging or an engine-driven low pressure blower.
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