In the study AVL BOOST™ is used to perform a thermodynamic simulation of a six-stroke engine, being built by
a research team based in Saudi Arabia. The six-stroke cycle consists of a standard four-stroke Otto Cycle followed by
a heat recovering steam expansion cycle. Water is injected into the hot combustion chamber towards the end of the
Otto expansion stroke producing steam, which is used to perform work on a piston. This process produces power
using waste heat and therefore increases the overall efficiency of the engine. The Robin EY28D engine, which is a
single cylinder, four-stroke, gasoline engine was used for this simulation study. The engine was modelled and
converted into six-stroke engine in AVL BOOST. The results show that six-stroke engine is more efficient than
four-stroke engine. In six-stroke engine, the engine power is increased by 33.1% and brake specific fuel consumption
(BSFC) is decreased by approximately 16%. Where emissions are concerned, Nitrogen Oxide (NOx) emission from
six-stroke engine is reduced by 80%, while the Hydrocarbon (HC) emission increases by 85% compared with the
original 4-stroke. Moreover, the most efficient camshaft was found and designed according to the most efficient valve
profile for this engine, which is combination of 60CA° of valve duration and 10 mm of valve lifting.
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