Patent ID: 8381870

Claim:
A system for attenuating sound in a combustion engine, the system comprising: a combustion engine emitting a gas flow resulting from a combustible reaction taking place at the combustion engine; an exhaust pipe coupled to and extending away from the combustion engine, the exhaust pipe channeling the gas flow away from the combustion engine; and an attenuation chamber coupled to the exhaust pipe by an inlet, the inlet configured to receive the gas flow channeled away from the combustion engine by the exhaust pipe, wherein the attenuation chamber is larger in volume than the inlet thereby allowing the gas flow to expand within the attenuation chamber, the expansion of the gas flow resulting in a decrease in the speed of the gas flow as the gas flow passes through an outlet coupled to the attenuation chamber, the decrease in speed of the gas flow resulting in a reduction in audible sound associated with the gas flow, wherein the attenuation chamber includes a curvature that substantially unfolds at a constant order of growth when measured at equiangular radii between the inlet and the outlet, the curvature inducing a vortical flow that reduces turbulence and decreases audible sound associated with the gas flow.