Engine Exhaust.

[Stephen Rampton]

Hello everyone, hope all’s well. 👍

I’m looking for any information regarding the engine’s exhaust, the one on my boat looks new but it looks a bit long, loops before leaving the hull, had anyone any tips as to wether it needs to be that long? Water gathers in the loop, it doesn’t hinder the engine but I’m assuming it’s not helping either, any advice would be much appreciated, thanks in advance 😃👍

[Bob & Freddy Tuffnell]

The loop should go up almost to the top of the transom, well above the waterline before coming back down to the exhaust outlet fitting, in fact above the level of the highest waves that you can imagine that could ever try to catch up with the boat.  If not, when sailing, there is a risk of water getting back into the exhaust system, and eventually flooding the engine.
once running, the pressure created by the exhaust gas easily blows out the water from the cooling system which is injected into the exhaust just after the engine, AS LONG AS the diameter of the silencer, and the outlet tubing has been correctly sized to suit the engine. All engine manufacturers give guidance on that in the installation manual. The photo is of a typical installation, but using a commercial type of gooseneck shaped secondary silencer, instead of a loop of hose.

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