The Effects of Valve Mechanics on A Small SI Engine Performance

Variable camshafts on car engines is a technology that is no longer called modern, but has been in use for a long time. Now even motorcycles and small-capacity engine vehicles have begun to apply this technology. The camshaft is optimally optimized for the fuel feeding speed as well as the discharge speed. As a result, fuel is burned more optimally, as well as when the combustion is finished, is discharged faster leading to increased engine power. Some effective technologies have been applied on internal combustion engine to increase engine power. Almost all of these technologies help engines to increase more free air into the cylinder of intake cycle and throw more exhaust gas in cylinder to outside air of exhaust cycle as a result engine effective have been efficiently improved. This paper presents solution via simulation to increase GV-300S engine power by re-designing cam profiles to improve efficiency of intake cycle and exhaust cycle. To achieve this goal, a simulation model of GV-300S engine has building via AVL-Boost software and an experimental system has installed with dynamo testing system. Effective technologies have been applied and the result of cam profile design shows an increase of 9.2% at 900orpm and 4.97% for engine power and air mass flow respectively.