Patent ID: 6463641
Filing Date: 2002-10-15
Classification: F02B,Y02T,Y10T

Abstract:
A method of manufacturing an exhaust system for a Honda Gold WingÂ® motorcycle which includes a horizontally opposed six-cylinder engine and a plurality of exhaust ports, each exhaust port in communication with a cylinder of the engine to discharge a pulse of exhaust gas, the method comprising the steps of:forming a plurality of primary exhaust pipes, each having an inlet end and an outlet end, wherein the inlet end is configured to connect to one of the plurality of exhaust ports to scavenge the pulse of exhaust gas; forming two collector chambers, each connected to and in flow communication with at least one outlet end of the plurality of primary exhaust pipes, wherein the two collector chambers alternate in their collection of subsequent discharges of the pulse of exhaust gas from the engine; forming two s-tube pipes from a pair of approximately 180 degree elbow pipes attached at one of their ends in the shape of a non-coplanar s-tube, wherein each s-tube pipe is connected to and in flow communication with one of the collector chambers and crosses each other; forming a gas accelerator chamber connected to and in flow communication with both of the s-tube pipes, wherein the gas accelerator chamber has two exhaust inlets and two exhaust outlets, wherein each exhaust inlet is aligned to direct the pulse of exhaust gas onto a flow splitter which is in the gas accelerator chamber, wherein the flow splitter is located obliquely to the flow direction of the pulse of exhaust gas to divide the pulse of exhaust gas between the two exhaust outlets, wherein the two exhaust outlets direct the distributed pulse of exhaust gas away from the flow splitter forming a low-pressure zone in the wake of the pulse of exhaust gas, and wherein the low-pressure zone preferentially travels back up the exhaust system to scavenge the subsequent pulse of exhaust gas; and forming two secondary exhaust pipes, each having an upstream end and a downstream end, wherein each upstream end is connected to and in flow communication with one of the two exhaust outlets.