Modified Compression Ratio Effect on Brake Power of Single Piston Gasoline Engine Utilizing Producer Gas

An objective of this research is to test the brake power of Honda Model GX-120-four strokes-spark ignited engine. The producer gas was made from dry wood by the gasification process. The producer gas was used as a fuel for the engine. To study the effect of compression ratio and percentage of opened air inlet valve on break power, the compression ratio of 7.5:1 and 9.3:1 and percentage of opened air inlet valve of 30% and 75% were used. It was found that the brake power of compression ratio at 9.3:1 with 75% of opened air inlet valve was 1,443.6 Watts at 3,800 rpm showed the highest break engine power because the high compression ratio was high, and the brake power was also high as the basic theory of an ideal Otto cycle.