Greg wrote:

an you imagine the safety issues
with a dry exhaust system on a pleasure craft ..


The first time I ever fished offshore in Hatteras (circa 1964?) we went out
with Cap'n Eif O'Neil in a 3x' boat with a centrally mounted V-8 and vertical
stacks like you see on a truck, with , dare I say it, asbestos sleeves on them.

40 years of debauchery later and I am still alive!

It was loud like a Harley but not oppressive.


There are pleasure boats around with dry stack exhausts. The local
publisher of a cruising magazine had a 28-footer built with a dry stack,
but he dumped the boat after a season. Noise, soot, heat. But on larger
pleasure craft, the stack can be isolated and insulated. You still have
that stack, though, and sometimes some soot.

On a cruiser, a closed cooling system with keel cooler and a wet exhaust
presents interesting possibilities.