In order to prevent a decrease in oil pressure on the RB26, which occurs at high RPM, the bulk oil pump will increase the output quantity. Although it changes the efficiency, the output quantity increases to nearly 23-30% with RPM. Using SCM435 chrome molybdenum steel for the material for the gear, it guarants high strength. Trouble with output quantity at high RPM is prevented by the fact that form and width of the pump were also modified. Because the output quantity increases substantially, the GReddy bulk oil pan becomes a prerequisite.