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Abstract
Effects of the number of fins, fin pitch and wind velocity on air-cooling were investigated using experimental cylinders for an air-cooled engine of a motorcycle. Experimental cylinders that had a various number of fins and fin pitches were tested in a wind tunnel. Then the temperature inside of the cylinder, on the surface of the fins and in the space between the fins was measured. Results indicated that the heat release from the cylinder did not improve when the cylinder had more fins and too narrow a fin pitch at lower wind velocities, because it was difficult for the air to flow into the narrower space between the fins,so the temperature between them increased.This paper describes our effort to find out the effect of thickness and geometry on engine cylinder fins for temperature distribution, for this purpose, we have used fins with rectangular geometry, triangular geometry and thickness 2.5mm, 3mm.