[Rhodes22-list] Lift Mufflers (was Air Conditioning)

[Herb Parsons]

You are right, at least concerning my Coronado. The lift muffler is for a below the waterline system.

Herb Parsons

S/V O'Jure
  1976 O'Day 25
  Lake Grapevine, N TX

S/V Reve de Papa
  1971 Coronado 35
  Lake Pontchartrain, Louisiana Coast

>>> bill at effros.com 5/29/2005 5:07:41 PM >>>
Herb,

I'm not really sure of my ground here, (again, we all used to leave most 
of this stuff to Roger, and we'll need to develop some new technical 
protocols) however, I'm pretty sure lift mufflers are primarily used for 
inboards below the water line.  Wet systems are used for engines above 
the water line, and employ pumps to bring the water into an exhaust 
system specifically designed to operate in this manner.

Water cooled exhaust system manufacturers go out of their way to exhort 
users not to use their systems unless their engines are designed for the 
added back pressure, and can be safely attached.

The Hondas are air cooled engines designed to freely exhaust into the air.

I'll stick to my guns, at least for now, and continue to strongly 
recommend against attaching a hose to a little Honda generator and 
putting the other end of the hose in the water.

Bill Effros



Herb Parsons wrote:

>I disagree with the statement below. I know the Rhodes 22 doesn't (often?) come equipped with an inboard engine; however larger boats frequently make use of lift mufflers. A lift muffler basically pull water into a cannister, the engine's exhaust goes into that cannister, pressure builds up (and the engine is muffled at the same time) until enough pressure builds to push the water out of the cannister. Then the cycle starts again.
>
>  
>
>>>>bill at effros.com 5/29/2005 10:23 AM >>>
>>>>        
>>>>
>...
>BTW Putting an exhaust hose into water is a really really bad idea.  It 
>creates back pressure that the engine is not designed for.  This will 
>shorten the life of the engine, but more importantly in this 
>application, it will cause improper combustion which increases carbon 
>monoxide output.  The back pressure will also damage the exhaust system 
>causing it to leak above the water line.
>...
>
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>  
>
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