variavel0=<b>José Eduardo Mautone Barros</b> - emautone@zaz.com.br CEFET-MG
<b>Vander Ferreira Rodrigues</b> - vander@cetec.br CETEC-MG
<b>Ramón Molina Valle</b> - ramon@vesper.demec.ufmg.br UFMG
<b>Abstract.</b> This work compares the ISO-1585 piston engine test procedures with two different quasi-static procedures. One of the quasi-static procedures is based on keeping constant the rotational engine speed for 1 minute before changing it. This procedure results in a step test when using a continuous data acquisition system. The other quasi-static procedure is based on changing the rotational speed continuously from idle point to its maximum value, and back to idle point, in a way that load and speed stay alwaysr on PID equilibrium. So, it is possible to acquire hundred of data. The objective is to demonstrate the equivalence between three test procedures, in an attempt to reduce the test time. The advantage is to reduce the time required to execute engine test. Curves of performance are shown for a in-line four-cylinders, 1300 cm3, 16 valve engine for the three procedures. The results showed the equivalence between the static and the quasi-static test procedures.
<b>Keywords.</b> Internal combustion engine, Piston engine, Dynamometer, Engine testing.