Estudo de viabilidade de arranjos de válvulas primárias e secundárias para cabeçotes de motores

Abstract

The highly competitive market makes more and more automotive industries improve their vehicles to meet consumer demand as well as the requirements of government regulations and legislation regarding safety and the environment. Several techniques are employed to increase the efficiency of an engine, one of which is related to the volumetric efficiency of the exhaust gases and the engine intake, and another technique is related to the increase in the compression ratio. According to these requirements, the present work aims to elaborate a cylinder head that uses a new arrangement of valves for internal combustion engines composed of a conventional main valve and a secondary axial rotary valve and to perform simulations of tests of a flow bench with the help of CAD tools. The proposed cylinder head is based on an original set, where the head of the Volkswagen 1.6 AP Carburized Engine, the camshaft 049H and the inlet and exhaust valves of that cylinder head are chosen. The results obtained were satisfactory, since the proposed models had higher flow values compared to the original reference model, having as Set 6 the most optimized, presenting a flow of 150.65 CFM, resulting in an increase of more 100% over the original assembly for maximum valve expansion.