[Public-list] muffler pipe

[Drenning]

George, Gordon,

I have to agree all things are subject to failure.  On my boat the 
muffler system was stainless steel and it failed and since the failure 
was prior to the cooling water being introduced we almost burnt the boat up!

When I went to rebuild the exhaust system I talked to Dr. Bruce Rankin.  
He had just finished rebuilding his and he used black iron, so that was 
the material I used in mine. 

I realize when the A30's were converting to the water lift system Bob 
Marshall engineered a muffler system using bronze, and
to the best of my knowledge none of these have failed.  I do not 
remember why Bruce did not want to use bronze, I seem to recall that he 
said the bronze was subject to becoming hard and brittle due to the heat 
BUT please check this out.
Pat

George Dinwiddie wrote:

>Gordon White wrote:
>  
>
>>DO NOT USE black iron or galvanized in the muffler system. If you ever 
>>have a muffler break - as we did  - you'll never forget it.
>>    
>>
>
>I think that you can have a break with any material, if you leave it 
>long enough.  The last time I replaced my exhaust, it was because the 
>flange rusted and blew out, not the pipe.  No matter what you use, you 
>have to inspect it regularly (and replace as needed) if you don't want 
>failures under way.
>
>On the other hand, I've found that engine failures are an excellent way 
>to hone your sailing skills.
>
>  - George
>
>  
>

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