TOPICS ON THE DEVELOPMENTAL WORK OF HIGHLY SUPERCHARGED DI (DIRECT INJECTION) DIESEL ENGINES

The development of a series of six direct injection, high output diesel engines with cylinder bores ranging from 105 mm. to 185 mm. is discussed. The results of basic combustion tests using a single cylinder test engine with 150 mm. bore and their application to each engine are shown. The developed engines, all highly turbocharged are extensively used as main and auxiliary engines for ships, as generator engines for power stations, and for such applications as driving pumps. Also described are engine problems in a low load range and 5000-hr. field test results of the 150 mm. bore engine on a fishing boat over a two-year period. The engine development work has demonstrated that the use of a swirl type combustion system can reduce the load on fuel injection equipment. The swirl ratio for the highly turbocharged engine must be set at a higher level to compensate for damping of the swirl due to the valve recess, as compared with naturally aspirated engines of the same size. As a result, the engine becomes less sensitive to the changes of the swirl ratio and injection timing. With an increase in cylinder bore, the optimum swirl ratio becomes lower, the contour of the combustion chamber has to be changed from deep to shallow, and the number of fuel injection nozzle holes increased for optimum operation. The swirl combustion system is advantageous up to a cylinder bore of 180 mm.

• Supplemental Notes:
  • Published in HS-030 302 (SAE-SP-468), "New Diesel Engines, Combustion, and Emissions Research in Japan," Warrendale, Pennsylvania, 1980, pp 137-50. Presented at the SAE International Off-Highway Meeting and Exposition, Milwaukee, 8-11 September 1980.
• Corporate Authors:

  Society of Automotive Engineers (SAE)

  400 Commonwealth Drive
  Warrendale, PA  United States  15096
• Authors:
  • Mori, M
  • Arakawa, S
• Publication Date: 1980

Media Info

• Pagination: 14 p.

Subject/Index Terms

• TRT Terms: Combustion; Diesel engines; Fuel injection; Superchargers; Turbochargers
• Old TRIS Terms: Direct injection engines; Swirl; Turbocharging
• Subject Areas: Safety and Human Factors;

Filing Info

• Accession Number: 00380114
• Record Type: Publication
• Source Agency: National Highway Traffic Safety Administration
• Report/Paper Numbers: SAE 800982, HS-030 311
• Files: HSL, USDOT
• Created Date: Dec 30 1983 12:00AM