Description
The PSA EW/DW engine is a family of straight-4 black-top automobile engines manufactured by the PSA Group for use in their Peugeot and Citroën automobiles. The EW/DW family was introduced in 1998 as a replacement for the XU engine. Some DW engines are produced as part of a joint-venture with Ford Motor Company.
The EW/DW uses many parts from the XU, most notably the crankshaft, but is built with lighter materials. The EW name is used for the petrol engines ("e" for essence ) and DW for Diesel engines.
All EWs are DOHC multivalve with displacement from 1.7 to 2.2 L (1,749 to 2,231 cc). They are mainly used for large family cars and executive cars, as well as large MPVs, although the 2.0 L is also used for some hot hatch models.
The DW started with an SOHC 2-valve design between 2.0 and 2.0 L (1,968 and 1,997 cc), later receiving DOHC and four valves per cylinder upon the introduction of the 2.2 L in 2000 with the Citroën C5 and Peugeot 607. Turbocharged versions started using common rail and received the commercial designation HDi. The DW10 served as the basis for the Ford/PSA engine partnership using second generation common rail and a variable-geometry turbocharger for the first time on the 2.0 L design.
