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A Study on the Influence of Plastic Intake Manifold on the Performance and NVH of In-line 4 Cylinder Gasoline Engine
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Abstract
The primary purpose of using a plastic material instead of conventional aluminum cast for intake manifold is to reduce its weight and cost. Moreover, the use of plastic for intake manifold is regarded as a key for further development of so called an “intake modular system”. As a secondary effect, the engine power can be increased with the help of improved interior surface roughness and lowered air temperature. With regard to NVH, however, plastic intake manifold is considered somewhat negative since it is less rigid and less dense than aluminum one.
In this paper, the mechanism that plastic intake manifold affects the performance and NVH of in-line 4 cylinder gasoline engine is presented. In connection with engine performance, air flow efficiency of not only intake manifold itself but also other components of intake system and also cylinder head is evaluated. The difference of intake air temperature passing through plastic and aluminum manifold is measured when the engine is operated from cold start and in hot WOT(wide open throttle) condition. As for NVH, natural frequencies and damping ratio of manifolds are measured by impact hammering method and then the measurements of level of noise and vibration on an engine dynamometer and a vehicle are accompanied.
The manifold is made by two injection molded pieces and assembled by vibration welding technique.
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LEE, K., "A Study on the Influence of Plastic Intake Manifold on the Performance and NVH of In-line 4 Cylinder Gasoline Engine," SAE Technical Paper 980728, 1998, https://doi.org/10.4271/980728.Also In
References
- Lee Jordan Roessler Lisa “Vibration welded Composite Intake Manifolds - Design Considerations and Material selection Criteria” SAE 970076
- Yo Han, Ji “The Effect of Intake Air Temperature on Knocking and the Performance of Gasoline Engine” Internal Report of Hyundai Motor Company 1994
- Kinoshita Masaki Enomoto Yoshiteru “Study on Temperature Measurements of the Inner Wall Surface and the Intake System in a Four Stroke Gasoline Engine” JSAE 9303096
- Missuhiromiyake, Siego Tsukakoshi Miya Hisakazu “Development of Plastic Intake Manifold” SAE 930085
- Fukunaga Masaru Tashiro Keisuke “Application of Resin Material to Intake Manifold” 46 5 Japan Automotive Technology 1992
- Irwin J.D. Graf E.R. “Industrial noise and vibration control” Prentice Hall 1979