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Combustion Chamber Design for Two-Stroke Cross-Flow Outboard Engines
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English
Abstract
The factors considered in the new design of combustion chambers for 2-stroke cross-flow outboard engines are combustion control and trapping and air flow considerations. The former includes (1) compression ratio and the effects of surface-to-volume ratio; (2) volume location as determined relative to the piston baffle; (3) spark plug temperature; (4) knock and pressure rise control as related to flame travel and change of volume of mixture consumed; (5) octane number requirements; (6) the effect of thin rings on metal temperature and engine friction; and (7) oil-fuel mixture effects on friction and power. Trapping and air flow considerations include (1) flow path control as determined by static pressure rise; (2) pressure reversals in air column with possible back flow; and (3) fuel separation in boundary layers and effects on carburetion.
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Citation
Endicott, D. and Tervo, W., "Combustion Chamber Design for Two-Stroke Cross-Flow Outboard Engines," SAE Technical Paper 620170, 1962, https://doi.org/10.4271/620170.Also In
References
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- Taylor Taylor “The Internal Combustion Engine.” 2nd edition Pennsylvania International Textbook Co
- Schweitzer, “Scavenging of Two Stroke Cycle Diesel Engines.” New York Macmillan Co. 1949
- Taub, “Method and Machine for Avoiding Combustion Chamber Calculations,” SAE Jour. 36 April 1935 159
- Janeway, “Combustion Control by Cylinder Head Design,” SAE Transactions 1929
- Kerley Thurston, “The Knocking Behavior of Fuels and Engines.” Paper presented at SAE Fuels and Lubricants Meeting, Philadelphia November 1955