Emission reduction for small utility two-stroke engine
As a result of the authors` research 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, they here discuss how much exhaust emissions can be reduced with only minor modifications of an engine. For the purpose of reducing emissions, they 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. The authors 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 the authors solved the problems by modifying the combustion chamber and the exhaust port shape, keeping the emissions reduced as mentioned above.
- OSTI ID:
- 253591
- Report Number(s):
- CONF-950942-; ISBN 1-56091-673-7; TRN: IM9630%%42
- Resource Relation:
- Conference: Small engine technology conference and exposition, Milwaukee, WI (United States), 13-15 Sep 1995; Other Information: PBD: 1995; Related Information: Is Part Of Proceedings of the 1995 small engine technology conference: Small engines and the environment. P-292; PB: 497 p.
- Country of Publication:
- United States
- Language:
- English
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