Abstract
Generally, in direct injection Diesel engines for passenger's car, is necessary to reduce the ignition delay time if the speed of engine increase. As results of the studies carried out in Automotive and Engines Department of University TRANSILVANIA Brasov was develop a new system for control ignition delay time in D. I. Diesel engines, with application in direct injection Diesel engines for passenger's car design and manufacture [1]. This new system effects the injection system parameters. The papers present the influence of pilot injection system on operating condition of injection system.