Science of Silence
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What is a wet exhaust system?

A wet exhaust system allows the exhaust gas from the engine to be cooled very efficiently by injecting the raw/sea water that has been circulating around the engines heat exchangers in the exhaust. Larger vessels may have a dry exhaust system going through the funnel, which are very hot and heavy. A wet exhaust system will keep everything cooler inside the boat, aside from noise and heat reduction. As the engine operation temperature is cooler, this also means that exhaust systems can be made of less heat-sensitive materials, which are not only better for vibration issues, but are more cost-efficient, too.

A wet exhaust system is one that is located inside the hull of the craft, through which water is “injected” or passed to cool the engine. While larger boats may have “dry” systems, it’s common for almost all small to mid-size yachts to have a wet exhaust system in place. Other benefits, aside from noise and heat reduction, include a reduction in the smell caused by emissions. As the engine operation temperature is cooler, this also means that exhaust systems can be made of less heat-sensitive materials, which are not only better for vibration issues, but are more cost-efficient, too.

Installing a marine wet exhaust system

The seawater is passed through a wet exhaust system via a special pump fixed to the engine. The water is typically passed through the engine cooler before being injected into the exhaust itself, to lower the temperature.

Rubber marine hose can be used when installing this system, either to create the pipework entirely (in small vessels) or to connect various parts of it. In cases where vibration and noise seem to be a particularly big issue, many yacht owners will opt to use a silencer when installing the system. Specially formulated to work in conjunction with this type of exhaust system, composite silencers can have a dramatic impact on noise pollution, making them ideal if you primarily sail in areas with stringent regulations, or on contained lakes as opposed to open water.

To achieve noise and vibration attenuation and enjoy an overall smoother, quieter ride, a marine wet exhaust system is a great choice. You can be sure that your engine is running at an optimal level

Have more questions about installing a wet exhaust system? Contact the experts at Halyard Ltd to discuss your needs.

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