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A Stratified Charge Two-stroke Spark Ignition Engine (Ram Straticharge, Vee-4, 108.6 In3 Disp.) Performance Characteristics

Helmut Edward FandrichStanford University. Department of Mechanical Engineering

出版	Stanford University, 1964
URL	http://books.google.com.hk/books?id=lzIEAAAAIAAJ&hl=&source=gbs_api

註釋The RAM vee-4, two-stroke stratified charge engine is a spark-ignition, blown, pressure lubricated, port valve engine with a cam actuated auxiliary air inlet poppet valve. It is designed to operate with lean air-fuel ratios, like a compression-ignition engine, but with a low compression ration and spark ignition. No carburetor is employed. Either timed or continuous manifold fuel injection upstream from the auxiliary valve may be used. The tests reported here are for continuous injection. Valve timing had the most pronounced effect on hydrocarbon emissions, followed by auxiliary-air pressure. Spark timing, oil temperature and jacket water temperature also influenced the emissions but to a lesser extent. These adjustments also affected the specific fuel consumption. Generally an adjustment which reduced the air-fuel ratio also reduced the hydrocarbons. The current data suggest that timed fuel injection in place of continuous injection may result in a further significant reduction of hydrocarbons in the exhaust. (Author).