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This cooling system allowes the turbocharger altercoolers to be cooled down using the same coolant as the engine, but on a separate piping network, separate circulating pump, radiators and fans. The reason for such system was strictly to increase the engine output (+HP's). And in these days the EPA emission regulation for locomotives was not a concern as it's now. Furthermore it been observed that lower the air box temperature offers an improvement in regard to emission reduction as well. So today new and many rebuilt EMD 645 and 710 engines are equiped with four (4) pass aftercoolers instead of a two (2) pass as in the past (better efficiency). BTW the new Metra MP36PH-3S equiped with a 16-645F3B is design as such using a 50/50 water glicol mixture as aftercoolers coolant. The engine coolant is still treated water as before.Don <br /> <br /> <br />
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