Fluid Flow, Combustion and Efficiency With Early or Late Inlet Valve Closing

Research output: Contribution to journalArticle


This paper is a study of the effects of valve timing and how it influences the in-cylinder fluid flow, the combustion, and the efficiency of the engine. An engine load of 4.0 bar imepdndedt was achieved by setting the inlet valve closing time early or late to enable unthrottle operation. Inlet valve deactivation was also used and asymmetrical valve timing, i.e., valve timing with the two inlet valves opening and closing at different times. The valve timing was altered by switching cam lobes between the experiments.


  • Fredrik Söderberg
  • Bengt Johansson
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Other Mechanical Engineering


  • Combustion, Fluid Flow, Variable Valve Timing, Engine
Original languageEnglish
JournalSAE Transactions, Journal of Engines
Issue numberSAE Technical Paper 972937
StatePublished - 1997
Publication categoryResearch

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