What Causes Heavy Black Smoke from the Engine?

[McPeter]

Heavy black smoke from the engine can be caused by the following reasons: 1. Clogged air intake: A blocked air intake fails to provide sufficient air during combustion, leading to incomplete combustion and resulting in black smoke from the engine. 2. Insufficient compression: Inadequate compression prevents the required pressure from meeting combustion demands, worsening combustion conditions and causing the engine to emit black smoke. 3. Changes in combustion environment: Long-term use of the engine and other factors can alter the shape and volume of the combustion chamber, further degrading the quality of air-fuel mixture. Poor mixture formation and deteriorating combustion conditions can produce black smoke.