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I have read all the responses and yet no one has identified the possible reason that Alco's smoked more than EMD Dismals. I am an Alco fan and even my licence plate says "ALCOPWR". Remember that all EMD's were tweo stroke engines, that is, they fired on every upward stroke of the piston, whereas, all Alco engines were four stroke engines where they fired on every other stroke of the piston. Consider that the fuel increase in the engine accelerated the engine speed, the EMD's were more responsive, therefore the turbo could keep up. On the other hand, the Alco engine firing every other stroke, sucked up a lot of raw fuel through the cylinders, thus creating a very rich mixture and having the large turbo laging behind, because the hot gases in the exhaust actually turn the turbo, created a great amount of smoke because of the rich fuel mixture. All turbocharged engines do this to a certain extent, that is why some companies use two small turbos instead of one large turbo to compensate for the turbo lag. Todays engines use extremely light turbo compressors to give quick engine response.
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