* Fuel delivery issues: Too much fuel being injected into the cylinders (due to a faulty injector pump, injectors, or a faulty sensor) will cause thick black smoke. This is a serious issue that needs immediate attention.
* Air intake restrictions: A clogged air filter or other restrictions in the intake system will reduce the amount of oxygen available for combustion. This leads to incomplete combustion and will produce excessive black or grey smoke.
* Turbocharger problems: A malfunctioning turbocharger (worn bearings, damaged vanes) can lead to uneven fuel-air mixture and smoke.
* Engine wear: Worn piston rings or cylinder walls allow oil to enter the combustion chamber, leading to bluish-white smoke. This is a serious indicator of engine wear and impending failure.
* Incorrect fueling: Using the wrong type of diesel fuel (incorrect cetane rating, contaminated fuel) can lead to increased smoke.
In short, making a 6.5 turbo diesel smoke *intentionally* is not recommended. Excessive smoke is a symptom of a problem, usually a serious one that could cause lasting damage to your engine. If your engine is smoking excessively, you should have it diagnosed and repaired by a qualified mechanic rather than trying to make it happen.
