This study presents a four stroke and six stroke comparative analysis of Internal Combustion (IC) Renault engine (Mercedes-Benz 250SE, W108 model) efficiency using MATLAB 2018b simulation tool. Using air (working fluid) as charge introduced in the four stroke engine, efficiency of 36.6% was achieved. However, using air as the charge introduced with a recompression stroke occurring at the fourth stroke, efficiency of 43.2% was obtained. Using air as the charge introduced with an exhaust stroke occurring at the fourth stroke, efficiency of 48.4% was obtained. Using water as the charge introduced with a recompression stroke occurring at the fourth stroke, efficiency of 44.6% was obtained. Using water as the charge introduced with an exhaust stroke occurring at the fourth stroke, efficiency of 51.5% was obtained. The results indicated that six stroke engine has a higher efficiency than four stroke IC engine when air is used as working fluid while the efficiency of six stroke IC engine is higher when water is used as working fluid compared to when air is used.
Key words: Efficiency, Internal combustion, Six Stroke, Four stroke, Renault engine.
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