Performance and exhaust emissions of a two-stroke spark-ignition engine with a direct-injection system

Yasuhiro Daisho, Takeshi Saito, Noriaki Ishibe, Mitsuhiro Tsukada, Masashi Yukawa

Research output: Contribution to journalArticle


A direct fuel-injection system has been adapted to a small two-stroke spark-ignition engine to prevent the charge from flowing through the cylinder during the scavenging process. The injection system consists of a jerk-type pump and a single-hole nozzle which supplies gasoline to the cylinder. Engine tests were carried out for comparison with the carbureteur version of the same engine. The results show that the direct-injection version can achieve greatly improved thermal efficiency and lower HC and CO emissions without intake throttling. In addition, NOx can be reduced to a much lower level than that of the ordinary four-stroke engine. Heat release analysis and high-speed photography indicate that stratified charge combustion takes place in the direct-injection engine.

Original languageEnglish
Pages (from-to)113-124
Number of pages12
JournalInternational Journal of Environment and Pollution
Issue number1-2
Publication statusPublished - 1991


ASJC Scopus subject areas

  • Environmental Science(all)
  • Environmental Chemistry
  • Pollution

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