Pengaruh Volume Knalpot terhadap Tingkat Kebisingan pada Motor Bensin.

This research studied the influence of muffler volume on the noise level of petrol engine. In this research, 5 pieces of muffler were made with volume various types but the same forms. The test was conducted by Engine Research and Test Bed GWE-80/100HS-A V, with loaded variation of 1500, 1750, 2000, 2250, 2500, 2750, and 3000 rpm. This research taken accoustic and engine performance data. The measurement of accoustic data using by a tape recorder, it is placed 1.25 meters in front and beside of exhaust pipe. And then the record of accoustic data was analysed by Signal Analyser. The result of this research indicated that performance of engine was not influenced by the size of muffler, but the effect of noised depend on location of measurement. Keywords: muffler, noise and petrol engin