SDI (engine)

The SDI engine is a design of naturally aspirated (NA) direct injection diesel engine developed and produced by Volkswagen Group for use in cars and vans, along with marine engine (Volkswagen Marine)[1][2] and Volkswagen Industrial Motor[3] applications.

The SDI brand name (derived from "Suction Diesel Injection" or "Suction Diesel Direct Injection", the latter a literal translation of the ‹See Tfd›German: Saugdiesel-Direkteinspritzung)[4][5][6] was adopted in order to differentiate between earlier and less efficient indirect injection engines, called SD[4] or "Suction Diesel", which were also produced by Volkswagen Group.

SDI engines are only produced in inline or straight engine configurations; and as they originate from a German manufacture, are designated as either R4 or R5, taken from the ‹See Tfd›German: Reihenmotor. They are available in various displacements (from 1.7 to 2.5 litres), in inline-four (R4 or I4) and inline-five (R5 or I5), in various states of tune, depending on intended application.

The SDI engine is generally utilised in applications where reliability and fuel economy are of primary concern. These engines lack any type of forced induction, hence the use of 'suction' in the title, and their power output is lower than a turbocharged engine of similar displacement. For example, the 2.0 SDI engine fitted to the Volkswagen Golf Mk5 has a peak power output of 55 kilowatts (75 PS; 74 bhp); whereas the same engine in Turbocharged Direct Injection (TDI) form is rated at 103 kilowatts (140 PS; 138 bhp) or 125 kilowatts (170 PS; 168 bhp), depending on specifications.

  1. ^ "Volkswagen Marine > Engines <". Volkswagen.de. Volkswagen Group. 2009. Archived from the original on 19 July 2011. Retrieved 4 November 2009.
  2. ^ "Boat engines from Volkswagen Marine – Self-study programme M001 – Design and function" (PDF). Volkswagen Marine. Volkswagen Group. April 2001. Archived from the original (PDF) on 19 July 2011. Retrieved 18 February 2010.
  3. ^ "The SDI 1.9 Industrial Engine" (PDF), mi-uk.com, Volkswagen AG, March 2005, archived from the original (PDF) on 14 July 2011, retrieved 4 November 2009
  4. ^ a b "Volkswagen Caddy owners manual, RHD models", Volkswagen AG, 2000
  5. ^ Max Bohner; Richard Fischer; Rolf Gscheidle (2001). Fachkunde Kraftfahrzeugtechnik (in German) (27 ed.). Haan-Gruiten: Europa-Lehrmittel. ISBN 3-8085-2067-1.
  6. ^ "Abbreviations". SGPetch.co.uk. SG Petch Ltd (SEAT franchised dealer). Archived from the original on 29 November 2010. Retrieved 17 December 2009.