What Causes a Diesel Engine to Lose Power and Emit Black Smoke?

[AryaRose]

When a diesel engine emits black smoke and loses power, it is generally caused by incomplete combustion due to uneven fuel supply (too much or too little) to each cylinder, insufficient air intake, poor atomization quality, or premature injection timing. Below are the reasons why a diesel engine emits black smoke and loses power: 1. Insufficient fuel supply: If the amount of fuel in the cylinder is too low, the heat generated by combustion decreases, failing to meet the engine's load requirements, resulting in power loss and incomplete combustion, which leads to black smoke. 2. Poor spray quality: During diesel engine operation, if the injector's spray quality is poor, the surface area of fuel sprayed into the cylinder decreases, reducing the oxygen mixing rate and the heat generated. 3. Insufficient air intake: If the engine's air intake is insufficient, the carbon atoms in the fuel cannot fully react with oxygen atoms, reducing the heat released, causing power loss and incomplete combustion, which results in black smoke.