Wayne.B wrote in
:

On Sun, 22 Jul 2007 21:01:44 -0500, Geoff Schultz
wrote:

Thanks for the nomenclature edification. I'm certainly not versed in
this. Regardless of what you call it, is this a reasonable solution?
Based upon the previous response, it sounds OK.

Yes, it sounds reasonable with all of the usual caveats about proper
design, construction and installation.

One of the problems with many sailboat engines is that they are
frequently below the waterline which makes cooling water exit very
problematic. There is something called a water lift muffler which is
supposed to alleviate this issue by creating a "one way" valve in the
exhaust flow. My old Cal-34 had one but it eventually malfunctioned
and allowed water ingress in a following sea. Fortunately the Atomic
4 had nine lives and always recovered from such mistreatment but it
was a nuisance at best. Eventually I installed a rubber flapper valve
at the transom exit and that solved the problem.

All that I'm doing is replacing the mixing elbow with this riser and all of
the other components are remaining the same. The output of the riser will
go to the water lift muffler. I haven't had issues ingress issues.

-- Geoff