thinking of this...
Join Date: Jun 2007
Location: Chesapeake Bay, South River
Thanked 1 Time in 1 PostRep Power: 10
Black Smoke is caused by partially burned fuel. When the fuel/air mixture increases there is insufficient oxygen present in the cylinders to complete the combustion process. Large quantities of carbon are then produced which appear from the exhaust as minute black soot particles. Engines with turbochargers have additional sources of black smoke.
Black Smoke Insufficient Air:
Causes: Air intake filter clogged  - Air intake restricted  - Exhaust restricted  - Leaking inlet or exhaust valves  - Poor engine room ventilation 
Black Smoke Excessive Fuel:
Causes: Defective injector(s)  - Incorrect injector nozzle  - Injector pump incorrectly set  - Low fuel grade 
Black Smoke Engine Overload: As load increases the governor senses the slight decrease in RPM and adjusts the injector pump to deliver more fuel. If the engine becomes overloaded then the increase in fuel does not increase RPM and no extra air is being sucked into the cylinders. Net result - soot:
Causes: Boat bottom dirty  - Propeller dirty/fouled  - Engine alignment incorrect  - Propeller incorrect  - Transmission incorrect ratio So here are my specifics:
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