Patent ID: 6581376
Filing Date: 2003-06-24
Classification: F01N,F02B,Y02T

Abstract:
A method for tuning a sound attenuated, exhaust system of a four-cylinder aircraft engine to improve engine performance and reduce fuel consumption comprising the steps of:a) determining a total length for each exhaust channel; b) positioning one set of two exhaust channels with headers having a first trajectory on one side of the heat exchanger arrangement which communicates directly through one endplate of the heat exchanger box and traverses a distance to an opposite endplate on an opposite side prior to bending the first set of two exhaust channels approximately 180Â° to reverse the direction of each channel and into the exit portion of the heat exchanger box on the one side, forming one set of two exhaust channels; c) positioning a second set of two exhaust channels with headers having a second trajectory, the second trajectory having a greater length than the first trajectory, on the opposite side of the heat exchanger arrangement, the headers having a second trajectory are bent into a U turn before communicating directly through the opposite endplate of the heat exchanger box and traversing a distance to the one endplate of the heat exchanger box on the one side, forming a second set of two exhaust channels; d) creating an exit portion of the heat exchanger box wherein both the first set of exhaust channels and the second set of exhaust channels empty into a single the collector; and e) adding an exhaust tube having a muffler connected to the single collector for noise attenuation.