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Intake manifolds have an important function on pollutants emission, which physical characteristics like regular air pressure loss and difference among runners are some factors that influences on performance and fuel consumption. To a fast development of new intake manifolds which find current targets, is necessary to use computational methods. In this case CFD was used to reduce some intermediate prototypes. However it is mandatory consider that models need adjustment and correlation with actuality to be good tools. This paper shows numeric simulations and experimental results from some manifolds, correlating and validating about several features, attributing so some confidence to model.

In this paper an intake manifold has its performance evaluated as a SLS technique rapid prototype and the final plastic molded product. The main difference between these manufacturing methods is the surface's roughness. A comparison of the flow characteristics from both is performed through air flow bench testing. These components were also tested in engine dynamometer, having its performance evaluated in a real engine.