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Improvement of the Torque Characteristics of a Small, High-Speed Engine Through the Design of Helmholtz-Tuned Manifolding
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Abstract
Manifolding for a 600cc four-stroke engine to be used to power a vehicle entered in the 1989 student Formula SAE® competition was tuned to maximize mid-range torque. Although powerful computer programs exist to analyze manifold wave dynamics, these programs are unavailable to the public; lacking access to these types of programs, Helmholtz tuning theory was chosen for use in this work due to its straightforward computational methods. Although the assumptions of Helmholtz tuning theory may not rigorously apply at high engine speeds, it was successfully used to provide design guidelines for the selection of manifolding physical parameters, and was applied successfully to increase engine output. Intake tuning of the engine with the required restrictor and single carburetor yielded torque levels of as much as 12% higher than the unrestricted stock engine with four carburetor set-up. Exhaust system tuning using the same theory succeeded in developing an exhaust system that complemented the intake system tuning, together producing as much as 34% more torque than the unrestricted stock engine.
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Citation
Jameson, R. and Hodgins, P., "Improvement of the Torque Characteristics of a Small, High-Speed Engine Through the Design of Helmholtz-Tuned Manifolding," SAE Technical Paper 900680, 1990, https://doi.org/10.4271/900680.Also In
References
- Adams, T. G. “Effect of Exhaust System Design on Engine Performance,” SAE Paper 800319 1980
- Babu, M. K. G. Murthy, B. S. “Simulation and Evaluation of Exhaust and Intake System of a Four-Stroke Spark Ignition Engine,” SAE Paper 760763
- Benson, R. S. “Nonsteady Flows in Engine Gas-Exchange Systems,” A.S.M.E. Paper 69-WA/DGP-9 1969
- Blair, G. P. Goulburn, J. R. “An Unsteady Flow Analysis of Exhaust Systems for Multicylinder Automobile Engines,” SAE Paper 690469
- Chapman, M. Novak, J. M. Stein, R. A. “A Nonlinear Acoustic Model of Inlet and Exhaust Flow in Multi-Cylinder Internal Combustion Engines,” A.S.M.E. Paper 83-WA/DSC- 14
- Engelman, H. W. “Design of a Tuned Intake Manifold,” A.S.M.E. Paper 73-WA/DGP-2 1973
- Golden, B. G. “Wave Phenomena and Conditioning of Induced Air and Exhaust Gas in the Operation of Internal-Combustion Engines,” A.S.M.E. Paper 61-OGP-7 1961
- Goyal, M. Scharpf, G. Borman, G. “The Simulation of Single Cylinder Intake and Exhaust Systems,” SAE Paper 670478
- Leydorf, G.F., Jr. Minty, R. G. Fingeroot, M. “Design Refinement of Induction and Exhaust Systems Using Steady-State Flow Bench Techniques,” SAE Paper 720214
- Shimamoto, Yuzuru Oka, Minoru Tanaka, Yutaka “A Research on Inertia Charging Effect of Intake System in Multi-Cylinder Engines,” Bulletin of the JSME 21 153 Paper No. 153-19 March 1978
- Tabaczynski, R. J. “Effects of Inlet and Exhaust System Design on Engine Performance,” SAE Paper 821577
- Taylor, C. F. Livengood, J. C. Tsai, D. H. “Dynamics in the Inlet System of a Four-Stroke Single-Cylinder Engine,” Transactions of the A.S.M.E. October 1955
- Thompson, P. Engelman, H. W. “The Two Types of Resonance in Intake Tuning,” A.S.M.E. Paper 69-DGP-11 1969
- Vorum, P. C. “Short Pipe Manifold Design for Four-Stroke Engines,” A.S.M.E. Paper 76- WA/DGP-4 1976
- Vorum, P.C. “Short Pipe Manifold Design for Four-Stroke Engines: Part II,” A.S.M.E. Paper 80-DGP-6 1980
- Yagi, Shizuo Ishizuya, Akira Fujii, Isao “Research and Development of High-Speed, High-Performance, Small Displacement Honda Engines,” SAE Paper 700122