RESEARCH PAPERS: Noise Control and Acoustics

An Experimental Study of Induction Noise in Four-Cylinder Internal Combustion Engines

[+] Author and Article Information
J. S. Lamancusa, K. B. Todd

Mechanical Engineering Department, Penn State University, University Park, PA

J. Vib., Acoust., Stress, and Reliab 111(2), 199-207 (Apr 01, 1989) (9 pages) doi:10.1115/1.3269842 History: Received January 01, 1988; Online November 23, 2009


Induction noise has become a major source of consumer complaints in automobiles powered by four-cylinder engines. Induction noise typically manifests itself as a low frequency booming or “mooing.” It is most noticeable and objectionable under wide open throttle, hard acceleration conditions. In an effort to understand the basic causes of this noise, so that potential remedies might be more intelligently applied, an extensive study was undertaken. Careful measurements were made on a four-cylinder, motored engine. Dynamic pressure variations within the induction system, and external to the engine were studied. Peak to peak pressure variations of over 2 psi were found in the intake runners at the valves. Evidence of nonlinear acoustic behavior was found. A detailed examination of the events that cause induction noise is presented.

Copyright © 1989 by ASME
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