Designing Microcontroller-Based Water Injection in The Motorcycle to Improve Engine Performance
This research aims to develop technology that is used to improve engine performance and to reduce detonation by using a water injection system. The use of water as additional fuel, have been around since the internal combustion engine found. It's just the old water injection system where is manually driven, so that the proportion of fuel mixture is not right. Its development is providing microcontroller-based electrical automation systems. With this new system, the engine performance of a motorcycle to be better. The research used experiment method. The experiments were done on a motorcycle using a microcontroller-based water injection (WaI). The microcontroller is used to automatically adjust the water injection to inject distilled water (aquades) and methanol into the fuel chamber. Microcontroller-based WaI system is mounted on the motorcycle with the fluid composition: (1) Distilled water/Aquades: 100% (A100%), (2) Distilled water 90%, methanol 10% (A90% + M10%), (3) Distilled water 80%, methanol 20% (A80% + M20%), (4) Distilled water 70%, methanol 30% (A70% + M30%), (5) Distilled water 60%, methanol 40% (A60 %+ M40%), (6) Distilled water 50%, methanol 50% (A50% + M50%). Testing is done by measuring engine performance parameters includes the torque, power, mean effective pressure, and specific fuel consumption. Based on the experimental result, we got the conclusion: (1) there is a positive effect of microcontroller-based WaI at the engine performance on the torque, power, mean effective pressure, and specific fuel consumption. This result compared with the motorcycle without microcontroller-based WaI. (2) The highest torque achieved with microcontroller-based water injection (Aquades 50% + methanol 50%) is 14,29 Nm at 6250 rpm and the lowest torque with microcontroller-based water injection (A100%) is 13,07 Nm at 6162 rpm. (3) The highest power achieved with microcontroller-based water injection (M50% +A50% ) is 10,22 kW at 7724 rpm and the lowest power generated with microcontroller-based water injection (A100%) is 9,27 kW at 7049 rpm. (4) The highest mean effective pressure with microcontrollerbased water injection (M50% +A50%) is 288,32 kN/m at 6250 rpm and the lowest mean effective pressure with microcontroller-based water injection (A100%) is 261,84 kN/m 2 at 5750 rpm, 6250 rpm and 6500 rpm. (5) The lowest Specific fuel consumption used microcontroller-based water injection (M50%+A50%) are at 5500 rpm, 6500 rpm and 7500 rpm with 0,0734 Kg/kWh.