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darth_nek t1_j61b7vl wrote

Reply to comment by spatzelface in diesel emissions laws by grim4926

Why do they call it "rolling coal"?

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Moot_n_aboot t1_j61d2pw wrote

You modify the fuel system to dump too much diesel into the engine to the point that it doesn’t burn all the way and it pukes out a massive cloud of dark black smoke. It looks like a coal smoke. That where the name comes from.

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