Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1992-03-03
1993-09-21
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60314, F02B 2704
Patent
active
052458245
ABSTRACT:
The invention communicates a resonant volume with a conventional resonant exhaust system of a two-cycle engine such that the one decibel band-width of the resonant volume includes the peak RPM of the unmodified two-cycle engine.
The preferred embodiment of the apparatus comprises a quarter wave tube of optimal dimensions that is closed at one end and attached to a conventional resonant exhaust system within an optimal zone.
The process or method comprises the steps necessary to design the optimal length and cross-section area (or band-width) of the quarter wave tube and its placement on a conventional resonant exhaust system. From a suitably detailed graph or tabulation of power versus RPM for an unmodified engine, two critical RPM values are determined. The effective speed of sound within the exhaust system is estimated. Using the two critical RPM values and the speed of sound within the exhaust system, the optimum critical frequency of the tube (thus the length of the tube) and the optimum cross-section area of the tube are determined. The tube so designed has its open end attached to a conventional resonant exhaust system at a point closer to the cylinder than the middle of the section of constant cross-section.
While the preferred embodiment of the present invention involves a conventional resonant exhaust system attached to a single cylinder, the method is believed to be useful with exhaust systems attached to a plurality of cylinders.
REFERENCES:
patent: 3064417 (1962-11-01), Tryhorn
patent: 4558566 (1985-12-01), Shirakura
patent: 4941319 (1990-07-01), Yamamoto
Hart Douglas
McLaughlin James C.
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