Air intake plenum for attenuating sound from a marine engine
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United States of America Patent
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Jun 14, 2022
Grant Date -
N/A
app pub date -
Oct 27, 2020
filing date -
Oct 27, 2020
priority date (Note) -
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Abstract
An intake plenum is for a marine engine, the marine engine having first and second throttle devices for controlling flow of intake air to the marine engine. The intake plenum has an airbox providing an expansion volume, first and second inlets that convey the intake air in parallel to the expansion volume, first and second outlets that convey the intake air in parallel from the expansion volume to the first and second throttle devices, and first and second Helmholtz-style attenuator devices located at the first and second outlets, respectively. Together the first and second inlets, expansion volume, and first and second Helmholtz-style attenuator devices are configured to attenuate different frequencies of sound emanating from the marine engine via the first and second outlets.
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