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Emission Reduction for Small Utility Two-Stroke Engine
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English
Abstract
As a result of our researches into reduction of exhaust emissions for small utility two-stroke engines which are widely used for handheld equipment such as a brush cutter and a hedge trimmer, we here discuss how much exhaust emissions can be reduced with only minor modifications of an engine.
For the purpose of reducing emissions, we evaluated the effects of exhaust timing retard and of enleanment of carburetor mixture on mass emissions using the existing 25cc two-stroke engine, which emits high levels of HC and CO, and substantially low levels of NOx. We attained great reduction of HC and CO.
The power output, however, dropped and both the plug seat and the exhaust gas temperatures rose, which would detract the practicability of the engine. But we solved the problems by modifying the combustion chamber and the exhaust port shape, keeping the emissions reduced as mentioned above.
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Citation
Tamba, S., Yamamoto, M., Yuasa, T., and Yoshimizu, I., "Emission Reduction for Small Utility Two-Stroke Engine," SAE Technical Paper 951767, 1995, https://doi.org/10.4271/951767.Also In
References
- “ Test procedures For the Measurement of Exhaust Emissions from Small Utility Engines - SAE Recommended Practice J1088 JUN 83,” Society of Automotive Engineers June 1983
- Douglas R. “ AFR and Emission Calculations for Two-Stroke Cycle Engines ” SAE Paper No. 901599 September 1990
- Tomitsuka K. Study of Two-Stroke Engines Yokendo, Japan 1996
- Blair G.P. The Basic Design of Two-Stroke Engines Society of Automotive Engineers 1-56091-008-9 1990