On the Heat Flow from the Pistons in a Farm Type Gasoline Engine

Abstract

Concerning the investigations on the heat flow from the piston of gasoline engine, there have been few reports. In this report, the following are described : (1) The measurement of temperature distributions of the pistons, piston rings, cylinder wall and gas in the crankcase. (2) The measurement of the rate of heat flow from every part of a piston at the speeds of 1500, 2500 and 3500 rpm and comparison of these experimental results with Ibrahim's calculation. (3) Comparison of piston temperatures, when various piston rings are used. Results are as follows : (1) Rate of heat flow from the piston rings and ring lands to the cylinder wall is 81% at a speed of 3500 rpm of full load. (2) The heat transfer coefficient on the inner surface of the piston is 35∼60 kcal/m²hr°C, (3) and besides, interesting data on the effect of piston ring upon the cooling of piston are obtained.