DESIGNING AND PROTOTYPING OF AN ALTERNATIVE ELLIPTIC INTERNAL COMBUSTION ENGINE
In the conventional internal combustion engines, the elements of linear movement cause the friction power to increase the manufacturing economy to deteriorate and also cause vibration. The diameter of intake valves, which is smaller than the diameter of the cylinder, causes the volumetric efficiency to decrease. In the two stroke engines, in which the number of work per cycle is increased, power output per unit volume (kW/liter) is higher; however, specific fuel consumption decreases considerably. In this study, an alternative elliptic internal combustion engine, in which crankshaft, camshaft and valve mechanism are not used, has been designed and its prototype has been manufactured. The elliptic engine works on 4 stroke Otto cycle principle. However, the cycle is completed in 360 degrees. The first prototype has been manufactured and provedworkable. And the problems related to the first prototype have been determined. It has been anticipated that by eliminating the problems that affect the running of the first prototype, some advantages for the second prototype could be obtained such as improved manufacturing economy, increase in the mechanical efficiency and decrease in the specific fuel consumption. Furthermore, the patent application of this new engine has already been made.