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Old 05-08-2010, 11:05   #1
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Stainless Exhaust

Does anyone know of a good supplier for a wet stainless muffler for yanmar 4jh2e, preferably in the u.s.

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Old 05-08-2010, 11:10   #2
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I had a stainless muffler on my previous boat back in 1979 at a cost of $200 and some change. It lasted about 2 years as the sulfer in the diesel mixed with salt water produced sulfuric acid which ate out the welds. I replaced with a 10 dollar plastic and it went till I sold boat still going strong.

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Old 05-08-2010, 12:26   #3
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Originally Posted by S/V_Surya View Post
I had a stainless muffler on my previous boat...It lasted about 2 years.
Exactly my experience, except less than 2 years. Exhaust will eat welds and cause cracking elsewhere. Plain or galvanized steel wrapped with insulating tape (motorcycle stuff) is far better.
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Old 05-08-2010, 13:02   #4
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Once you heat the SS when welding, you change the chemical composition and its the heat zone that rusts, so its just not worth the money.
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Old 05-08-2010, 14:18   #5

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Stainless + Diesel is a bad idea, eactly as the guys said because of acid corrosion. This is an application where you REALLY want "plastic".
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Old 05-08-2010, 14:26   #6
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G'day, mate. Looks like this outfit should be able to help out. Fiberglass is a successful alternative.
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Old 06-08-2010, 19:38   #7
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The best stainless exhaust riser fabricator is located in Ft. Lauderdale:
They make exhaust risers and systems for the mega-yachts. I had one built for my Perkins 6.354 diesel back in the early 1990's and it is still in perfect condition. You either need to give them an example or some engineering drawings of what you need. They are not cheap but the product lasts longer than you ever could imagine. After running for 12 hours at full cruise I can put my hand on the top of the riser and it is only warm.

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