Development of a Two-Stroke Petrol Engine Using Reverse Engineering Technique

Abstract

Two new brush cutter engines were procured for this study. One of the engines was disassembled, its different parts examined and the engineering drawings of the parts were made. The parts were fabricated, assembled and performance test was done, save for carburettor, spark plug, engine starter, flywheel and ignition coil. The other procured engine was used as the control engine during the performance test. The performance test results showed that the minimum speeds for both engines were closely related (i.e. 2800 rpm for the produced engine and 3000 rpm for the control engine). This is the speed that enables the engine to run without stalling. However, there was disparity in the recorded maximum speed for the two engines. The maximum speed of the produced engine was about 84% of the maximum speed of the control engine. The control engine had a steady operating temperature of about 140oC after running for 16 minutes while the produced engine had a steady operating temperature of 155.5oC under the same time. This showed that the operating temperature of the produced engine was about 11% higher than the control engine. In conclusion, although the locally produced two-stroke engine performed satisfactorily, there is still room for improvement.