▎ 摘　　要

This study comparatively investigates the influence of graphite nano-flakes (GNF) and graphene nano-platelets (GNP) additives on the performance characteristics of 4-stroke 3-cylinder gasoline engine (GE) viz., brake power (BP), mechanical efficiency (ME), engine torque (ET), brake specific fuel consumption (BSFC), and piston ring wear in engine oil grade SAE 15W40. The BP, ET, and ME of the engine using 0.1 wt.% GNP + SAE 15W40 and 0.1 wt.% GNF + SAE 15W40 enhanced by 3.7-4.8%, 3.1-6.3% and 2%; and by 1.8-3.8%, 2.3-5.2%, and 1.4% compared to virgin SAE 15W40, respectively. However, the BSFC and emissions were reduced by 1.7-3.8% and 2.0-4.0% for 0.1 wt. % GNP + SAE 15W40 and by 1.2-3.4% and 1-3% for 0.1 wt. % GNF + SAE 15W40, respectively. The 0.1 wt. % GNP dispersed SAE 15W40 showed improved performance of GE than 0.1 wt. % GNF dispersed SAE 15W40 and base oil SAE 15W40. Further, the piston ring wear was also evaluated and observed to decrease using 0.1 wt. % GNP/SAE 15W40. The formation of tribo-film on the wear track of the piston ring resulted in the reduction of abrasive wear and surface roughness, respectively.