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Turbo lag was the main reason for the smoke, also most early turbos were belt driven, so if you knocked the throttle right into the 4th or 5th notch, you were garunteed to have belt slippage. Thereforethe turbo does not accelerate as quickly as the engine itself, so it cannot force enough air into the cylinder fast enough. It ends up with there being a higher fuel to air ratio in the cylinder, and with more fuel, more exaust is created. Another interesting fact ALCo PA's (at least the D&H ones) had 3 different prime movers in their life; built with a 16-244, rebuilt with a 16-251C and later had a 12-251C installed.[:)][:D][8D]
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