Noise attenuating exhaust relief system for an outboard motor

Details Noise attenuating exhaust relief system for an outboard motor Noise attenuating exhaust relief system for an outboard motor

1989-07-07

1990-08-28

Peters, Jr., Joseph F.

Marine propulsion

Means for accomodating or moving engine fluids

Means for handling exhaust gas

60312, 181260, B63H 2126

Patent

active

049521829

ABSTRACT:
An exhaust relief system for an outboard motor includes an exhaust chamber into which exhaust is discharged from the engine. A first passage in communication with the exhaust chamber provides contraction of the exhaust as the exhaust passes rearwardly, from which the exhaust is discharged into an expansion chamber which substantially surrounds the exhaust chamber. From the expansion chamber, the exhaust is routed through and contracted into a second passage in communication with the expansion chamber, after which it is discharged to atmosphere. The tortuous path provided by the exhaust relief system of the invention, along with the repeated expansion and contraction of the exhaust as it flows to atmosphere, provides a muffling effect at idle operation.

REFERENCES:
patent: 3967446 (1976-07-01), Harralson et al.
patent: 4014282 (1977-03-01), Kollman
patent: 4421490 (1983-12-01), Nakahama
patent: 4668199 (1987-05-01), Freund et al.

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