Coal rollers” alter their diesel trucks so they spew thick black smoke, sometimes in the direction of joggers, cyclists and hybrid cars. read more
There are several reason(s), behind the rolling coal phenomena. A) Unintentional: A fuel injector is worn out, and one(or more) of the cylinders is getting more fuel than needed per injection. read more
And while official tallies of coal rolling do not exist, there are signs that smoke, whether from intentional belching or not, is a growing public nuisance. In Colorado, complaints over diesel smoke have risen 5 percent over the last two years. read more
Coal rolling seems to have originated from a rural motorsport called Truck Pulls, where diesel pickups challenge each other to see who can pull a weighted sled the farthest. To have an edge over their competitors, drivers modify their tricks to dump excessive fuel into the motor, giving them more horsepower, torque, speed and a better chance of winning. read more