Catalytic converter on a turbodiesel engine (BMW 5 Series E34)

The diesel engine with a catalytic converter features reduced smoke formation and reduced carbon content in the exhaust gases. The previous turbodiesel engine is installed as the base engine.

The turbocharger provides a high excess of air. Thanks to this, the fuel burns better than in a conventional diesel engine, which provides a noticeable reduction in smoke.

Reduced smoke formation makes it possible to use an oxidation catalyst, which is located under the bottom of the car in the exhaust tract instead of a preliminary muffler. As in gasoline engines, the catalyst consists of honeycomb monoliths with a platinum-rhodium coating. When flowing through the catalyst, more than half of the environmentally harmful carbon compounds contained in the exhaust gases are burned. In addition, the smell characteristic of the exhaust gases of diesel engines is reduced. Lambda regulation by means of a lambda probe, as in gasoline engines, is absent in diesel engines.