Influence of rotor magnet geometry variation on performance characteristics of a fuel-injected four-stroke motorcycle engine using high-ethanol fuel blends
Keywords:
Ignition timing, Rotor magnet modification, Bioethanol fuel blends, Engine performance, Exhaust emissionsAbstract
The effect of varying the rotor magnet trigger geometry on the performance characteristics of a fuel-injected four-stroke motorcycle engine is studied, focusing on the applicability of high-ethanol fuel blends for renewable energy alternatives. The following three rotor configurations were applied: a standard rotor, a rotor with an extended trigger segment (+2 mm), and one with a shortened segment (–2 mm). Performance tests using a chassis dynamometer and exhaust gas analyzer recorded torque, power output, and emission profiles under various mixtures of Pertalite–Pertamax–Ethanol up to 70%. It was observed that an extended rotor trigger segment can improve the response of ignition timing for more complete combustion. The maximum performance was obtained while operating on a mixture of 30:70 Pertamax–Ethanol, at a maximum torque of 8.15 N.m and 5.9 kW power. Ethanol-blended fuels proved to reduce emissions of hydrocarbon and carbon monoxide, pointing towards their role in promoting cleaner combustion and sustainable transportation energy transition.
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