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LOOP SCAVENGING versus THROUGH SCAVENGING of TWO-STROKE ENGINES
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English
Abstract
THIS paper reports the latest investigation of the relative merits of loop scavenging versus through scavenging. The authors hope that the conditions of the work permitted an objective evaluation of the two types of engines.
The results of the study may be summarized as follows:
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1.
With symmetrical timing, neither cylinder shows significant advantage in trapping efficiency.
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2.
With symmetrical timing, the best ratio of exhaust-port to inlet-port effective area seems to be about 0.6.
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3.
Unsymmetrical timing is an effective method of improving trapping efficiency.
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4.
The value of net indicated fuel economy shows no significant difference between the two cylinders.
The authors point out that because the areas were equal it is unlikely that the optimum port design of each type was used in comparing the cylinders. If optimum porting had been used, the two types might have shown more difference.
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Citation
Taylor, C., Rogowski, A., Hagen, A., and Koppernaes, J., "LOOP SCAVENGING versus THROUGH SCAVENGING of TWO-STROKE ENGINES," SAE Technical Paper 580044, 1958, https://doi.org/10.4271/580044.Also In
References
- SAE Transactions Vol. 62 1954 486 502 “Scavenging the 2-Stroke Engine,” Rogowski A. R. Taylor. C. F.
- NACA TN 1896 June 1949 “Improvement of Accuracy of Balanced-Pressure Indicators and Development of Indicator Calibrating Machine,” Livengood. J. C.
- “Comparison of Actual Engine Cycle with Theoretical Fuel-Air Cycle,” Van Deun J. J. Bartas. J. G. Thesis M.I.T. June 1950
- “Hydraulic Scale for Measurement of Engine Dynamometer Forces.” Bulletin No. 6 Jan. 3 1949 Diesel Engine Manufacturers Assoc. Chicago
- NACA TN 674 November 1938 “Scavenging a Piston-Ported Two-Stroke Cylinder,” Rogowski A. R. Bouchard. C. L.
- Study of Certain Aspects of Two-Stroke Cycle Spark-Ignition Engine with Gasoline Injection,” Sheaffer. B. L. Purdue University thesis 1957