Analisis Pengaruh Variasi Busi Terhadap Performa Motor Bensin 4 Langkah

Abstract

Engine bore up modification in motorcycles is an effort to improve performance, consequently raising the compression ratio. This increase fundamentally demands higher quality spark plug ignition for combustion to remain efficient. This research aims to quantitatively analyze the comparison of performance, including torque, power, Mean Effective Pressure (MEP), Specific Fuel Consumption (SFC), and thermal efficiency. Testing was conducted on a bore up modified 2008 Honda Tiger Revo engine, which had its initial piston diameter increased from 6.35 cm to 6.55 cm, thereby raising the compression ratio from 9.0:1 to 9.5:1. The study utilized three types of NGK spark plugs: standard/nickel, iridium, and platinum. The methodology employed was experimental, involving performance testing via a dynotest and measurement of SFC and thermal efficiency at engine speeds of 4000 rpm and 6000 rpm. The results consistently show that the Platinum spark plug delivered the best performance, achieving the highest peak torque of 19.35 N.m at 5500 rpm and a maximum power of 14.09 kW at 8000 rpm, which correlates with the highest peak MEP value of 1122.32 kPa. From the perspective of fuel usage and thermal efficiency, the Platinum spark plug was also superior, recording the lowest SFC (215.935 g/kWh) and the highest thermal efficiency (37.9 %). These findings prove that the platinum spark plug is highly optimal for effectively converting fuel energy in a high-pressure combustion environment.