Patent ID: 9359981
Filing Date: 2016-06-07
CPC Classification: B63H,F02B,F02M

Claim Text:
1. A method for modifying sounds produced by an air intake system for an internal combustion engine powering an outboard motor, the method comprising: routing intake air along a flow pathway defined through an air vent in a cowl covering the engine, to an open under-cowl environment surrounding the engine, and to a throttle body of the engine; collecting sounds emitted in an area of the open under-cowl environment proximate the throttle body of the engine via an inlet end of a sound enhancement duct, wherein the inlet end of the sound enhancement duct is not a part of the flow pathway; amplifying a first subset of the collected sounds having frequencies within a desired frequency range; and transmitting the amplified first subset of sounds to an area outside the cowl.