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Post by wirewheels on Dec 13, 2021 17:19:31 GMT -5
After spending enough time in our 2004 4260 - bought June this year - we are very happy except for the defining roar of the 8.1 big blocks when cruising above 2k rpm. It seems to me that routing the exhaust down into the water would help a lot, but there must be some reason the manufacturer decided to exit the exhaust on the sides above the waterline. Anyone have info on this?
I see ski boats have designs for "fresh air exhaust" where the exhaust outlet is extended down into the water for quiet and reduce CO risk. But I haven't seen anything like this for larger boats like the 4260.
Has anyone made improvements to reduce the fumes and noise on their boat?
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Post by gofast24 on Dec 14, 2021 11:14:01 GMT -5
After spending enough time in our 2004 4260 - bought June this year - we are very happy except for the defining roar of the 8.1 big blocks when cruising above 2k rpm. It seems to me that routing the exhaust down into the water would help a lot, but there must be some reason the manufacturer decided to exit the exhaust on the sides above the waterline. Anyone have info on this? I see ski boats have designs for "fresh air exhaust" where the exhaust outlet is extended down into the water for quiet and reduce CO risk. But I haven't seen anything like this for larger boats like the 4260. Has anyone made improvements to reduce the fumes and noise on their boat? No, exhaust entering below the water line will create excessive back pressure on the engines exhaust system, lost power, and if leak in the exhaust system piping inside engine room may sink your vessel! Only under water exhaust I know of would be on a I/O outdrive but in that case the water would have to travel up the lower unit before getting into engine/engine room. Just enjoy the sound ( great roar) of a 8.1 gasser Once we get going our exhaust sound is muffled by the audio system!
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