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A high-pressure fuel pump in a GDI (Gasoline Direct Injection) engine has been increasingly applied on passenger vehicles because of its high fuel efficiency and reduction of exhaust emissions. The design specifications of principal components of GDI high-pressure pump should be validated prior to the manufacturing. This study presents the analytical results of the specifications for the design of a GDI pump of Motonic Co. by using computational model based simulation. The results are largely divided into two parts. First, cam-follower dynamics with the proper design of cam profile, and second, the discharge flow performance of the pump in consideration of the characteristics of inlet control valve.

High interface friction is a cause for low efficiency in engine and driving lines such as bearing and cylinder. This paper investigates reduction of interface friction through laser texturing of contact surfaces by using single mode fiber laser, ultrashort laser and CNC machining center. Microgrooves are created using ultrashort pulsed laser on tool steel and SCM-420H steel which are used for linear bearing applications. The friction test was carried out with different lubricants and surface conditions. The tests showed grooves to indeed decrease interface friction and improved the efficiency of lubricant entrap. Physics of pulsed laser and material were analyzed and its advantages were described with given material.