Effect vibration characteristics in direct-injection engine with operated turpentine oil-diesel fuel blend

Abstract

Turpentine oil, mainly derived from clove oil, shows strong potential as a diesel additive due to its oxygenated composition, improving combustion and reducing emissions. Despite its environmental advantages, limited application persists due to high production costs. This study investigates the effects of adding 0.2% turpentine oil to diesel fuel on engine vibration characteristics in a single-cylinder direct injection engine. Vibration was measured along three orthogonal axes (X, Y, and Z) under two engine loads (25% and 50%) and five speeds ranging from 1200 to 2000 rpm. Results revealed that turpentine-diesel blends consistently reduced vibration levels on the Y and Z axes. At 25% load, the lowest RMS vibration with turpentine additive occurred at 1400 rpm, while for pure diesel, it was at 1600 rpm. At 50% load, minimum vibration for both fuels was observed at 1400 rpm. The turpentine additive reduced vibration magnitudes by up to 11.3% on the Y axis and 9.6% on the Z axis compared to pure diesel. These findings support using turpentine oil as a viable additive to improve ride comfort and reduce engine-induced vibrations, offering reference data for future studies on alternative fuels.