Natural zeolite is an alternative adsorbent. It needs firstly to be activated before using it as absorbent inorder to get zeolite with high adsorption capacity. Previously, the use of pelletized zeolite activated by NaOHphysic and KOH-physic with varied normalities was only performed in a diesel engine to observe the engineperformance.In this study there were two kinds of activation, that is chemical activation with NaOH activatorvariation on the normality of 0.25 N, 0.5 N, 0.75 N, and 1.0 N and physical activation with using a temperatureof 220 °C for 2 hours. All are made in the form of adhesive zeolite pellets with a diameter of 10 mm and athickness of 3 mm. From the test results and analysis showed that the use of chemically activated zeolite canimprove the performance of 4-stroke petrol engine when compared without using zeolite. The best performancein this experiment obtained at the normality of 0,75 N. At road test, the pelletized zeolite can reduce the fuelconsumption 23, 15 %, and 16,51 % at stationary test, and increase acceleration by 14,77 %.
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