Wet Exhaust

Trident hoses, bellows, humps and elbows set new standards for durability, safety & performance

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Wet exhaust systems have decided advantages over dry exhaust systems. They are quieter, cleaner and cooler; and do not pose a fire or burn hazard (eliminating the need for insulation beyond the water injection point). Today, most pleasure boats with inboard engines (for power, auxiliary, generator) have wet exhaust systems.

Typically, raw water is pumped from the engine intake seacock and strainer; through a heat exchanger, possibly oil cooler(s) and water injection nipple or mixing elbow at the exhaust manifold; and itâs dumped with the exhaust gas (cooled from 1100° F. + to less than 212°F. on most engines) into the wet exhaust piping and out the stern. Most commonly the latter is a combination of flexible rubber exhaust hose, bellows & elbows; sometimes fiberglass or stainless steel pipe (at least for connectors); and mufflers or silencers. Flexible hose, bellows an elbows are easier and simpler to run than rigid pipe. They are not subject to corrosion or stress cracking; and they absorb more engine movement, vibration and noise. While the highest quality black rubber exhaust withstands maximum continuous temperatures up to 250°F., some high performance engines emit wet exhaust at 300° to 500° F. Here only silicone rubber can be used.