Influencia de la Viscosidad del Lubricante como Sellante de Holguras en las Válvulas de un Motor de Combustión Interna Mediante Análisis de Vibraciones y Emisiones Contaminantes

The present investigation was done to cover the hypothesis described by several automotive mechanics “by increasing the viscosity of the lubricant we sealed clearances and reduced the pollutant emissions”. It was implemented an experimental design for the purpose of know the order sampling, based on different configurations of the input factors such as: clearance between rod and valve guide, degree of lubricant viscosity and additive for change lubricant viscosity, for analysis we have as output factors: vibratory signals and emissions of pollutant gases. For obtaining vibratory signals and emissions of pollutant gases we use an automotive scanner Multiscan, acoustic signal analyzer Adash, uniaxial accelerometer and a gas analyzer QGA-6000 brand Qrotech. Then, for processing of vibratory signals we use fast Fourier transform (FFT) to change the vibration signal from the time domain to thefrequency domain, finally, proceeded with a surface analysis, analysis of factorial graphs, by last, a study of the harmonics and temporary characteristics present in the spectra.