Detroit Diesel Series 50

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The Detroit Diesel Series 50 was an 8.5 litre, inline, 4-stroke 4-cylinder diesel engine. The Series 50 was built off of the existing block of the Detroit Diesel Series 60. It was officially introduced in 1993, but was available for trucks and buses in late 1992. The Series 50 engine was a popular bus engine in the United States and Canada. In addition, it was used for trucks, motor homes, and construction and industrial equipment. Detroit Diesel sold 200,000 units in total.[1]

The Series 50 engine was fully electronically controlled and used DDECIII and later DDECIV electronics. The overhead cam engine featured electronic unit injectors and was turbocharged and air-to-air intercooled. Being built off the Series 60, it shared the same cylinder kits, bearings, gear train, rocker arms, valves, and pumps.[2]

In response to the EPA 2004 emissions levels, Detroit Diesel announced revisions to the Series 50 for 2000. This included the addition of an exhaust gas recirculation (EGR) system and a variable geometry turbocharger (VGT). These components were controlled by the DDEC IV engine controls.[3] Though the EPA 2004 emissions standard did not take effect until October 2002, the engine was made available ahead of that time.[3] To further reduce particulate emissions to lower than 2007 levels of 0.01 g/bhp-hr, there is an option to use ultra low sulfur diesel and particulate filter.[4]

In September 2004, Detroit Diesel announced the discontinuation of the Series 50 for on highway applications. Remaining commitments were fulfilled into 2005.


Model Max. Power Max. revs Max. Torque
DD50 250HP 2100 rpm 735 lb-ft @ 1200 rpm
DD50 275HP 2100 rpm 890 lb-ft @ 1200 rpm
DD50 320HP 2100 rpm 1150 lb-ft @ 1200 rpm


  1. [1]
  2. Detroit Diesel Series 50,, retrieved on 2009-08-06
  3. 3.0 3.1 Detroit Diesel Unveils Year 2000 Series 50 Bus & Coach Engine,, retrieved on 2009-08-06
  4. DDC releases information on its 2002 “pull-ahead” Series 50 engines,, retrieved on 2009-08-06
Detroit Diesel
Current Products DD5 - DD8 - DD13 - DD15 - DD16
Former Products MBE 900 - MBE 4000 - Series 30 - Series 30G (CNG/LNG) - Series 40 - Series 50 - Series 50G (CNG/LNG) - Series 60 - Series 60G (CNG/LNG) - Series 53 - Series 71 - Series 92