Based on what I've read so far, I wouldn't do it. Mainly because if you
have to ask, you don't know your exhaust system well enough to mess with
it. <G>
However, the idea has some merit in a limited sense. For example, on my
boat I have an anti-siphon loop between the heat exchanger and the
exhaust riser elbow. I think that's required by ABYC, but could be
wrong. Anyway, the top of that loop has a ball valve to a hose that
dumps overboard. The idea is to take excess raw water and dump it
overboard before it gets to the exhaust system, to reduce back pressure
on the diesel. A human hand can really only stand temps below 180F, so
if you can hold your hand on the metal of the exhaust riser at the point
where it meets the exhaust hose, and leave it there without saying
'ouch' then the exhaust is about 180F and shouldn't melt your hoses or
water lift muffler. I dump a heck of a lot of water overboard before it
gets to the exhaust, and that's probably good given the length of the
hose run from engine to stern.
But, really, that water is *hot* coming from the engine. So you'd need
to add one of those fancy cockpit shower faucets to mix hot and cold,
and the cold would be coming from your tank unless you add another cold
water input somewhere with a separate pressure pump. Then there would
be a whole lot of plumbing and valves to deal with, to bypass the shower
when not taking a shower.
Frankly, it would be easier, safer, and less expensive to soap off and
jump overboard. I don't know what your water temps are like... Maybe
you could hang six or seven Sun Showers in series... (joke)
Wal
you wrote:
so pulling any cooling water away from the exhaust system would most likely
damage the system.
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