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Old 11-08-2015, 10:12 PM   #21
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Originally Posted by djmarchand View Post
Manifestly, definitely, absolutely not so. Look at Mainship Pilot 34s, Legacy 28s, most maybe all Carolina Classics, the list goes on on and on where manufacturer's have not "made the necessary modifications".

Follow boatdiesel for a month. There are at least three active threads at any one time about these situations. It is the most active topic on that forum.

David
Ditto what David said.
I see boats every day that are built to fail due to downright stupid exhaust system design.
Just because you paid good money for it does not mean it is good product.
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Old 11-09-2015, 07:08 AM   #22
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Nice Job! As others have mentioned, a support from the exhaust riser to the engine or in my case the transmission mount, would reduce load on the turbo and minimize vibration at the outlet of the riser.

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Ted
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Old 11-09-2015, 08:35 AM   #23
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Shoalwaters:

Nice job, especially considering the restricted dimensions in your engine room. I did a much less sophisticated job with an Isuzu 3CB in my old Albin-25 by simply adding a water injection tube to a plain stainless pipe elbow, without the added trouble of making it a double-wall. I wrapped it with header-wrap and it worked fine, even at high power settings - never got too hot.

Again - congratulations on a job well done.

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Old 11-09-2015, 02:06 PM   #24
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Originally Posted by kapnd View Post
Ditto what David said.
I see boats every day that are built to fail due to downright stupid exhaust system design.
Just because you paid good money for it does not mean it is good product.
And sadly, engine manufacturers sign off on the work because they have to warranty the engine. The engine manufacturers likely know it is not a good design...but they also know that the warranty twill be long gone once the problems start to cause issues.
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Old 11-09-2015, 04:07 PM   #25
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Thanks all.
Ted, I'm leaning in that direction.
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Old 11-09-2015, 04:23 PM   #26
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Quote:
Originally Posted by Shoalwaters View Post
The exhaust mixers (pic 1) on my Yanmar 4LH-DTE's left much to be desired. The seawater injection point was very close to the turbo and (in my case) external water level was/is, within 5" of turbo level.

Some online homework, including Boatdiesel, left me in no doubt that the hot part of an exhaust tract should go up and over before sea-water is injected - unlike the Yanmar elbow. Funds were limited, so pics 2, 3 and 4 are what I came up with. The water injection port is partially hidden by the down pipe in the seconds pic.

I seem to have got the mixer right because I can confortably put my hand on the exposed bit (just above the blue hump-hose) when the engines are pushing.

The hot risers got two layers of header-wrap as overhead clearance is minimal. It's applied wet and the blue dye-stuff gets everywhere! Can you spell wode!

The welded components are Sch #10 stainless pipe, elbows, end caps and flanges ordered from McMaster-Carr. The majority is 3" and the cost for both engines was around $350.00, TIG welding around the same again and the Trident elbows etc around $500.00.

I am a worrier, so water-flow and exhaust temperature alarms are on order from Aqualarm.
Nice work shoalwaters. When the guy built my davits we bought sst tubing from Columbia River mandral bending . He makes custom exhaust for hot rods . They have some on the shelf bends out of sst .
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Old 11-18-2015, 01:02 PM   #27
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Quote:
Originally Posted by Pack Mule View Post
Nice work shoalwaters. When the guy built my davits we bought sst tubing from Columbia River mandral bending . He makes custom exhaust for hot rods . They have some on the shelf bends out of sst .
I agree. I purchased my raw materials from them as well. Friendly, expedient shipping, cost efficient, and high quality.
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