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The Use of Large Valve Overlap in Scavenging a Supercharged Spark-ignition Engine Using Fuel Injection

出版	National Advisory Committee for Aeronautics, 1932
URL	http://books.google.com.hk/books?id=D__qSgAACAAJ&hl=&source=gbs_api

註釋This investigation was conducted to determine the effect of more complete scavenging on the full throttle power and the fuel consumption of a four-stroke-cycle engine. The test engine was scavenged by using a large valve overlap and maintaining a pressure in the inlet manifold of 2 inches of mercury above the atmospheric. The maximum valve overlap used was 112 degrees. The results of the tests showed that the clearance volume of an engine can be scavenged by using a large valve overlap and about 2 to 5 inches of mercury pressure difference between the inlet and exhaust valve. With a fuel-injection system when the clearance volume was scavenged, a b.m.e.p. of over 185 pounds per square inch and fuel consumption of 0.45 pound per brake horsepower per hour were obtained with a 6.5 compression ratio. An increase of approximately 10 pounds per square inch b.m.e.p. was obtained with a fuel-injection system over that with a carburetor.