#1
IP: 75.142.49.80
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General question about exhaust system
i occurred to me today that don't know why it is conventional to mix cooling water with exhaust gas. It seems like it causes problems. Why not just have a conventional muffler, and run the water straight out?
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"Halcyon" 36' custom sloop. 8 tons. Glass over strip plank mahoghany. Spruce mast and booms, launched 1969. Original A4. |
#2
IP: 76.7.144.132
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I think the short answer is heat. How do you have a water tight exit port for a pipe that is several hundred degrees without damaging the fiberglass or wood hull/deck? Dan S/V Marian Claire
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#3
IP: 107.0.6.242
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If you can fit a pipe straight up amidships with a shroud, you can do it like a commercial fishing vessel.
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#4
IP: 199.173.224.31
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Plenty of boats do use dry exhaust. They tend to be commercial boats that don't mind the heat and noise. Pretty much the entire crab boat fleet is that way and those things will wake up an entire anchorage at 0500. Of course they'll do a few close passes to make SURE you don't sleep in
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#5
IP: 99.124.190.130
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Curious about Halcyon - glass over mahogany as original or was that a refit?
How about the house? How about a photo (or 2 or 6)? |
#6
IP: 75.142.49.80
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Re pics, Its a work in progress, things like job and family have gotten in the way of bringing her back, I aim to haul the mast soon - all the varnish was blown off years ago. An aging A4 is just one of my ongoing projects I'll see if I can post some pics soon. Simon
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"Halcyon" 36' custom sloop. 8 tons. Glass over strip plank mahoghany. Spruce mast and booms, launched 1969. Original A4. |
#7
IP: 75.142.49.80
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Thanks all for reports on exhaust. Heat, noise, all makes sense. But the down side is all this trouble with exhaust systems, rust, water backing up, etc. Has anyone tried hooking up a normal (ss) automotive muffler? If one could solve the hot pipe issue, which I'm sure is solvable more elegantly than crab boat style, it might be a great simplification (?)
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"Halcyon" 36' custom sloop. 8 tons. Glass over strip plank mahoghany. Spruce mast and booms, launched 1969. Original A4. |
#8
IP: 199.173.224.31
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I saw a boat for sale with dry exhaust out the stern. They fabricated an outer and inner pipe and had an industrial blower running air in the space to keep it cool. What you are neglecting is 99.99% of dry exhaust boats use a vertical exhaust. Ever see a cargo ship with exhaust run out of the stern........didn't think so. You STILL have to make a water trap of some kind if running a horizontal exhaust.
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#9
IP: 199.168.148.136
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Durn Right
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TRUE GRIT |
#10
IP: 68.106.216.235
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" Any following seas will end up in the exhaust system and the engine."
no doubt! A vertical riser is needed. but water mixing isn't. I now understand why the water lift muffler, even though I still think there might be an alternative. In any case, thankyou all for contributing to this thread. No need to continue it
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"Halcyon" 36' custom sloop. 8 tons. Glass over strip plank mahoghany. Spruce mast and booms, launched 1969. Original A4. |
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