Two stroke petrol engine performance

Abstract

The aim of the project was to investigate the general performance of the two stroke cycle single cylinder petrol engine. Fundamental tests were performed such as consumption loop curves, brake horsepower and torque vs speed curves. In the more advanced testing the air flow for various throttles and speeds were performed by making slight modifications on the engines. Hence delivery ratio of the engine (volumetric efficiency) and by means of certain assumptions, the trapping , and scavenging efficiency of the two stroke engine for various throttle openings and speed were performed. A detailed heat balance of the engine was also made. For measurement of the temperature and velocity distribution a wooden duct was installed . Heat lost through exhaust was found by me ns of an electronic thermocouple calculating heat lost from the lagged pipes and muffler. Use was made of trapping efficiency in the heat balance to deter mine the air fuel mixture lost through scavenging. Orsat exhaust analysis was also used to find the heat lost due to incomplete combustion and also an estimate was made to find the radiation losses by use of Stefan's Law.