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Note: This paper will not be updated and most of its content has already been moved to new papers on engine fundamentals and on diesel engines. The following material is the last remaining section, soon to be updated and edited into a new paper on alternative, energy efficient powertrains.
Having briefly discussed one of the major advantages in diesel engines, that is fuel economy, one must consider how this parameter competes among other forms of internal combustion engines and other energy conversion machines in general. Figure 5, adapted from a study by Chrysler Corporation , gives a comparative analysis of thermal efficiencies of the following 6 types of powerplants: