Suction diesel

As Suction a is diesel engine referred to, does not have a charge , either through the turbocharger or compressor , features, but by the by the pulling movement of the piston resulting vacuum the combustion air into the cylinder through the open intake valve feeds ( naturally aspirated engine ).

Because of the significantly reduced expenditure on control technology and the lack of a turbocharger, such engines are cheaper, easier to maintain and easier to troubleshoot than supercharged engines. For this - with the same cubic capacity - a considerable loss of performance has to be accepted, which makes a vehicle equipped in this way appear much tougher in terms of its acceleration properties. In return, motors of this type are less prone to errors and have a longer service life. In low speed ranges, they give their power more willingly, because they do not have a so-called turbo lag .

At Mercedes-Benz there was the Mercedes-Benz OM 615 , which was built until 1995. This engine was available both with and without turbo. The simplicity of the engine usually resulted in a very long service life of sometimes more than 500,000 km.

At Volkswagen , this design was referred to as SDI ( suction diesel with direct injection ). The Volkswagen Group was also the only manufacturer that had a direct-injection naturally aspirated diesel in its range for passenger cars until September 2010. In the end it was only available for the VW Caddy .

literature

• Max Bohner, Richard Fischer, Rolf Gscheidle: Expertise in automotive technology. 27th edition, Verlag Europa-Lehrmittel, Haan-Gruiten, 2001, ISBN 3-8085-2067-1 .