Exhaust system for outboard motors

Details Exhaust system for outboard motors Exhaust system for outboard motors

1984-09-28

1986-08-26

Fuller, Benjamin R.

Acoustics

Sound-modifying means

Muffler, fluid conducting type

181235, 181239, 181273, 181276, 440 89, 60312, F01N 108

Patent

active

046077235

ABSTRACT:
Two embodiments of outboard motors incorporating improved silencing systems for the exhaust gases of the powering engine. In each embodiment, a Helmholtz resonator is provided by a resonance chamber formed at least in part by a spacer plate that is interposed between the power head and drive shaft housing of the engine and which communicates with an expansion chamber of the engine through a tuning neck. In each embodiment, the effective volume of the resonance chamber of the Helmholtz resonator is varied in response to engine speed by delivering coolant to it from the engine cooling jacket and discharging the coolant at a restricted rate.

REFERENCES:
patent: 3045423 (1962-07-01), Hulsebus
patent: 3967446 (1976-07-01), Harralson et al.
patent: 4421490 (1983-12-01), Nakahama

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