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The analysis of pressure losses in the cylinder head of an engine, which can compromise up to 70 % of engine efficiency is accomplished by a device called a flow bench, to evaluate the variation in flow and pressure between the inlet and outlet of the cylinder by reading in measurement instruments typically water column manometer. The paper describes the methodology used in the automation of a flow bench. A printed circuit containing pressure transducers (absolute pressure sensor to intake manifold) that send electrical to a microcontroller (Arduino) signals and is shown on an interface card was drawn. For temperature we opted for the use of a digital sensor with smaller margin of error for the same price (compared to analog sensor). The level of the valve is done by a digital caliper. In man machine interface are indicated test pressures and the percentage of flow, temperatures at admission and exhaust are indicated as well as the calibrated orifices are open.

This paper aims to improve a device, installed in the Laboratory of Engines at the Instituto Federal de Santa Catarina (IFSC), used by students and professors for classes and researches of ADeMCI (Performance Evaluation of Internal Combustion Engines) research group registered on CNPq. This paper presents the development of an automated flowbench for test cylinder heads using electronic features as MAP (manifold absolute pressure) and MAF (manifold air flow) sensors, commonly used in automotive systems to control the fuel injection in engines. Automated flowbenchs already exist in the international market, but their costs are expensive for the acquisition. This kind of device allows a cylinder test to be executed in a short time, with greater accuracy readings without the direct influence of the operator's ability. The automation of a flowbench like this will increase the capacity of testing of the laboratory, allowing to train more students and to develop more researches.