Abstract
This chapter emphasizes on medium speed engines with camshaft-actuated individual jerk pumps for each cylinder. It covers higher speed engines, including those that use camshaft pumps (or block pumps): those in which the entire jerk pump elements are grouped into one or more complete units, each equipped with a common camshaft. The essence of a diesel engine is the introduction of finely atomized fuel into the air compressed in the cylinder during the piston's inward stroke. It is, of course, the heat generated by this compression, which is normally nearly adiabatic, that is crucial in achieving ignition. A growing emphasis on economy and specific output, coupled with materials development and advances in calculation methods allowing greater loads to be carried safely, has left the direct injection principle dominant in modern medium speed and high speed engine practice. The chapter considers the fuel injection pump, which is the heart of the fuel injection system. Essentially, the pumping element is a robust sleeve or barrel that envelops a close-fitting plunger.
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