Karakteristik Tribologi Minyak Nyamplung (Calophyllum Inophyllum) Sebagai Alternatif Biopelumas Mesin Empat Langkah

Abstract

This study aims to analyze the value of friction coefficient, friction force, and wear rate of nyamplung oil (calophyllum inophyllumi) and SAE 10W-40 mineral lubricant. The lubrication variations used are a mixture of nyamplung oil and SAE 10W-40 lubricant with the composition M0 (100% SAE 10W-40), M20 (20% nyamplung oil + 100% SAE 10W-40), M40 (40% nyamplung oil + 60% SAE 10W-40), M60 (60% nyamplung oil + 40% SAE 10W-40), M80 (80% nyamplung oil + 20% SAE 10W-40), M100 (100% nyamplung oil). The test used an ASTM G99 pin-on-disc tribometer, with a temperature conditioning of 50ºC to determine how the lubrication performance at that temperature. Based on the test results, it was found that the M40 lubricant variation (40% nyamplung oil + 60% SAE 10W-40) had the smallest friction coefficient, friction force, and wear rate compared to other lubricant variations (without lubrication, M0, M20, M60, M80, M100), namely a friction coefficient of 0.074, a friction force of 4.767 N, and a wear rate of 0.00021 mm³/Nm. The results of this study concluded that nyamplung oil has the potential as a substitute for four-stroke engine lubricants, as evidenced by the addition of nyamplung oil to the biolubricant composition being able to reduce the friction coefficient, friction force, and wear rate.