The waterlift is a muffler for sure. Exhaust gases are mixed with water inside the chamber and noise is reduced.
More important - the waterlock chamber also accommodates all the water in the large tubes that go from the waterlock to overboard.
When the motor is shut off, there is water in the tubes downstream of the waterlock discharge. That water flows back into the water lock chamber - thus the backflow water volume gets stored/trapped/contained within the waterlock chamber itself. If there were no waterlock that water would flow back onto the the motor instead.
So the waterlock attenuates noise when the motor is running and (more important) stores surplus water when the motor is turned off thus protecting the motor from water back flows.
Charles
More important - the waterlock chamber also accommodates all the water in the large tubes that go from the waterlock to overboard.
When the motor is shut off, there is water in the tubes downstream of the waterlock discharge. That water flows back into the water lock chamber - thus the backflow water volume gets stored/trapped/contained within the waterlock chamber itself. If there were no waterlock that water would flow back onto the the motor instead.
So the waterlock attenuates noise when the motor is running and (more important) stores surplus water when the motor is turned off thus protecting the motor from water back flows.
Charles
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