PENGARUH MODIFIKASI PERMUKAAN PISTON (DOME) DENGAN BAHAN BAKAR ETHANOL TERHADAP TORSI DAN DAYA PADA MESIN 4 LANGKAH ASTRO 108CC

Replacing a standard piston with dome can make changes to the performance of 4 stroke combustion engine, this is due change in compression ratio being larger, thus requiring fuel that contains high octane number order get maximum results. In process researching which was originally raw convex shape, aims increase ratio, occur engine be observed from test data dyno. The results discussion or on effect ethanol-fueled surface reconstruction 108cc diameter 50 mm flat and 51.5 produces 16.855 / 1 use fuel. ethhanol fuel, it concluded obtained an uses power gain 8.8 HP, 27% piston, torque 7.79 Nm, about 9% engine.