Abstract

The performance of the naturally aspirated internal combustion gasoline engine at partial and full throttle depends on the temperature and moisture content of intake air. The combustion of the air-fuel mixture, being highly exothermic, increases the temperature of air intake assembly. This heated air intake assembly leads to an increase in the temperature of intake air, which in turn causes knocking and other performance losses. Effective insulation of air intake assembly allows the air into the engine at atmospheric temperature for the efficient combustion. In this study, an efficient method to improve the performance of spark ignition engine at low speed, by insulating the air intake assembly has been proposed. The effectiveness of the proposed insulated air intake assembly has been experimentally analyzed, and the results obtained are presented. The variation in different intake and performance parameters of the engine have been observed and recorded using LAUNCH C Reader VI code scanner. The experimental results have also been validated through basic theoretical relationships governing the design of internal combustion (IC) engines. The paper presents a comparative analysis of the various engine performance parameters, before and after insulating the engine.

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