Turbo charging the CNG fueled engine is a new concept for development of the natural gas vehicles. Investigating the performance of this type of engine based on the thermodynamic laws is a useful way that can help to improve the methods of exploiting the useful work from energy and exergy losses. In this study, energy and exergy analysis are applied to the experimental data of a turbo charged CNG fueled engine. The engine was EF7 TC, which is four stroke bi-fuel CNG-gasoline engine. The data are collected using an engine test unit which enables accurate measurements of fuel flow rate, combustion air flow rate, engine speed and all the relevant temperatures. Energy and exergy efficiencies are calculated for different engine speeds and compared. Results indicate that exergy efficiency is maximum at a speed of 2500 rpm and the speed in which the maximum exergy and energy occur are not the same. It is concluded that using the unused output energy of the engine can increase useful work and therefore improve engine efficiency.

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