This paper describes an experimental investigation into the effect of bore/stroke ratio on a simple two-stroke engine. This was achieved with a special purpose engine of modular design. The engine allowed four combinations of bore and stroke to be contrived to yield a common swept volume of 400 cm3 with bore/stroke ratios of: 0.8, 1.0, 1.2 and 1.4.Other factors that might affect engine performance were standardised: the exhaust, intake and ignition systems were common, the combustion chamber designs were similar, scavenge characteristics were similar, port timings and time-areas were kept the same, and cylinder and crankcase compression ratios were also kept the same.The most important conclusions were: The experimental investigation concluded that a square or slightly over square bore/stroke ratio produces an engine with the best brake performance.
An Experimental Investigation into the Effect of Bore/Stroke Ratio on a Simple Two-Stroke Cycle Engine
Sae Technical Papers
Small Engine Technology Conference & Exposition ; 1999
1999-09-28
Conference paper
English
Automotive engineering | 1999
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