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One of the most important components affecting performance in internal combustion engines(ICE) is the intake manifold. The present work presents an improvement of Spark Ignition (SI) engine performance by adding a swirl generator (mixer) within the inlet port. Experiments were applied on a singlecylinder, four-stroke, GREEN CUT AV3500 gasoline engine. Exhaust emissions compositions and fuel consumption are recorded. To understand the behaviour of airflow through the intake port with and without the swirl generator, a 3D model was analysed using Computing Fluid Dynamic (CFD) by ANSYS Fluent 2020 R1. Results show an enhancement of engine performance especially fuel consumption by 24%, and the concentration of CO in exhaust emissions by 67%. As well as, computationally, pressure drop improved with intake port equipped with the mixer.

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