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Old 12-28-2018, 12:18 PM   #21
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I have the exact setup you are asking about (just installed) with the water discharge right at the waterline not below. She goes in the water in a few hours so will post an update on if it totally muffles that splashing sound.
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Old 12-29-2018, 10:03 AM   #22
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I have the exact setup you are asking about (just installed) with the water discharge right at the waterline not below. She goes in the water in a few hours so will post an update on if it totally muffles that splashing sound.
Hi @Arthurc - so I'd love to know, how is that working out? And where on your boat is that discharge point? I'm guessing from the ER, so a bit forward of the cockpit.
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Old 12-29-2018, 11:07 AM   #23
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Got her in the water and did some testing yesterday evening. Overall I am super happy with the install, the water makes a standard running water noise that I get from my AC units or if someone is washing dishes but itís almost pleasant like a fountain versus the pulsing. Overall the genset got quieter too from inside the salon.
The discharge point is in the lazzerette so about 8ft from stern on the starboard side.
Hope that helps, happy to also take some pictures today.
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Old 12-29-2018, 11:59 AM   #24
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Nice. Glad it worked.

I worried a little bit that the water discharge would need a little backpressure from being under water for the whole system to work. Sounds like that was a non-issue.
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Old 12-29-2018, 12:15 PM   #25
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Correct, works like a champ, no water comes out the exhaust anymore. On a side note I was told if they do it below the waterline they tune the sep to still have some water coming out of the exhaust so you can tell coolant water is working. Thatís seems more irritating than the nice trickle sound the above the waterline water out makes.
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Old 12-29-2018, 03:46 PM   #26
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From the sep to wherever it discharges, its basically a gravity drain and has no effect on or need for backpressure.




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I worried a little bit that the water discharge would need a little backpressure from being under water for the whole system to work. Sounds like that was a non-issue.
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Old 12-29-2018, 03:55 PM   #27
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The reduction of noise is the result of several things.

The overall length of the exhaust run is increased from going up into the sep and then coming back down. Longer run makes the noise further away

The noise path is more torturous, 90* turn up, energy to push the water uphill, 180* at the sep, another 90* at the bottom, the more torturous the path the more noise energy is reduced

The sep itself is designed with a baffle to reduce noise

All these features PLUS the elimination of the splashing contribute to the reduction of exhaust noise.




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The exhaust is quiet. Real quiet. Not sure how it manages to suppress the sound so much but I surmise the exhaust pulses are pretty much eliminated after passing through the NL muffler and then the Gen Sep box.
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Old 12-29-2018, 04:02 PM   #28
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From the sep to wherever it discharges, its basically a gravity drain and has no effect on or need for backpressure.

Without the backpressure from being underwater, the water discharge could have been a mix of exhaust and water, still splashing. That's what I wondered if would happen. There is more than gravity moving things around.
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Old 01-04-2019, 01:53 PM   #29
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DO NOT commingle exhaust discharges, wet or dry, with anything, it's inviting the possibility of exhaust leaking into the cabin, or flooding, and it is a violation of ABYC guidelines.
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Old 01-05-2019, 02:25 PM   #30
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There’s always that little switch that turns the genset off, end of problem.
I’m fairly deaf, so I can be somewhat unsympathetic to such problems, but being on the water is synonymous with water sounds and motions, and is a large part of the appeal for me!
People who don’t like those things should take up golf instead of boating...
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Old 01-09-2019, 09:40 AM   #31
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Just installed new 9 kW NL ...opted for above WL cooling discharge vs below. Like very much to see and hear discharge. Not noisy at all.
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