Move generator exhaust outlet

I have mixed feelings about the exhaust separators for gensets. They are quieter, but I like having the ability to look out and see the water flow to confirm that my genset raw water pump is functioning correctly.

Moving the genset exhaust to either side, be aware that you can get blow back into the cockpit or if it is further forward, the exhaust may make its' way into the salon through a potential open window - not a good scenario. Certainly add a Carbon Monoxide sensor (located low, as Carbon Monoxide is heavier than air) as a necessary precaution.

Any change to the exhaust system piping layout can not adversely affect the exhaust back pressure and should be within the Genset manufacturer specs for back pressure.

My guess why they exhaust the gen out the stern:
1. Try to have the exhaust smell behind the boat when anchored (works OK. Not perfect)
2. Looks - keep the sides of the boat with as few outlets as possible
3. Cleaning - much easier to clean the stern than down the side

I'm not aware of any technical reason why you couldn't move it to the side. I would see how the sea water goes by your potential exit at all speeds. If you get a constant flow of water against the hull at that spot, you may need to put something in front of it to deflect the water so it can exhaust or move it to another place along the side.

No, it's not; which is why the location recommendation of CO alarms, such as Kidd, is for a dry location with good air circulation.

You are right, miss-information on my part, thanks for the correction.

Hi,

Some folks overcome this by the use of a brush, soap and elbow grease.

The first two can come from the marine store, the last must be supplied onsite by the operator of the first two or someone hired to operate them

P46,
Do you have a muffler?

I have an 8KW on my 46 with the transom exhaust.
Sometimes I can just about hear the water splashing but little to no exhaust noise.
If I am backed into a bulkhead I can hear the exhaust noise from the generator bouncing back.

I think I remember seeing a pic with swim platform on you boat, I might be wrong. Is it possible that the swim platform is helping to amplify the noise?

I have seen a Mainship with an exhaust extension extending past the swim platform.

The new Onan's are much quieter and don't smoke. A muffler will also help a great deal.

Hey P 46, Ralph is helping me on my old ONAN Gen and said you may still have your old exciter available. I am running some tests to see if mine is bad but I was wondering if your old one might be for sale? Thank

How often do you raft up with other boats? one of the main reasons why it is better to have the exhaust out the transom is that you don't dirty the side of your neighbor's boat and create excessive noise and vibration against their hull. I have rafted up alongside boats with generator exhaust that comes out the side and it usually leaves the side of my boat dirty which is not exactly easy to clean.
just my opinion

GMax

Position of outlets

There is one more point, where sailors may have a little advantage. On sailboats (especially larger ones) you can lead the generator(s) exhaust and the holding tank vent (without any filter) through the top of the mizzen mast. I know, it would look strange, to lead the exhaust past the tower on a SF but on larger MY, you will see the main engine exhaust to the side below the WL and the generator exhaust(s) through the mast. On the large 5-mast square rigger Royal Clipper even the main engine exhausts (twin Cat 3516) go through the masts.