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Old 08-02-2012, 02:28 PM   #41
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.turned out the truck was "Hecho en Mexico"...

The bigger problem is the BOAT engine is very different from the Truck engine , tho both are similar.
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Old 08-22-2012, 12:14 AM   #42
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The Cummins 6B NA reman is IMHO the best way to go. PMM last year had a good article on the Mexico rebuild plant, very impressive. Talk or e-mail with Tony Athens about service and warranty in your area. Suggest you get a thread going on boatdiesel.com on this same subject.
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Old 08-22-2012, 12:31 AM   #43
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Marin,
I think I've figured out the bow rising issue. I suspect what I've been saying about the bow rising applies to displacement hulls only. I've only used that observation on full disp boats and the concept of hull speed is somewhat meaningless on any other type so I was sharing that w you not knowing other hull types don't respond the same way. I've heard the bow rising concept on BoatDesign and other places. I'm not the only one that has had that concept. So maybe that explains it??
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Old 08-22-2012, 01:03 AM   #44
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Marin,
I think I've figured out the bow rising issue. I suspect what I've been saying about the bow rising applies to displacement hulls only.
You may very well be right. We don't have a displacement hull so what I've observed applies only to the hulls I've observed it with. I readily admit I don't know diddley about hull design, I just know what I see.
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Old 08-22-2012, 06:59 AM   #45
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You might want to do a search for recent articles by Steve D'Antonio. He wrote recently (in Passagemaker I think) that virtually all displacement hulls are way overpowered. He is pretty compelling on the issue. ..........
I read Mr. D'Antonio's articles and he is certainly very knowledgeable. I think sometimes he goes a little over the edge on certain issues. By stating that "virtually all displacement hulls are way overpowered", he seems to be saying that the engineers who design these boats don't know what they are doing. That puts him at odds with dozens of boat manufacturers. It makes me wonder.
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Old 08-22-2012, 07:14 AM   #46
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I read Mr. D'Antonio's articles and he is certainly very knowledgeable. I think sometimes he goes a little over the edge on certain issues. By stating that "virtually all displacement hulls are way overpowered", he seems to be saying that the engineers who design these boats don't know what they are doing. That puts him at odds with dozens of boat manufacturers. It makes me wonder.
Marrketing ultimately designs the boat, the NAs or enginerrs just make it work.

Got to know the NE Regional VP for marketing pretty well when I worked for Sea Ray/Marine Max...amazing how the process is so convoluted. That's why there's so many so-so boats with such a strong following.
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Old 08-22-2012, 01:36 PM   #47
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PSneeld-you are certainly right on the marketing angle. However, when it comes to power, I think the issue is the reverse for newer trawlers. The marketing angle is lower power, fuel efficiency. But you can really see the overpower in the big planing, or sportfishing, market. I saw a 63' sportfisher at a show last year with twin 1500 HP MTUs! I looked around the engine room and boy is a mechanic going to charge you for crawling around those babies. Like no work space. Top speed about 48 knots. The problem is, how many days can a 63' boat go 45 knots on the ocean? Or anywhere else for that matter? Fuel burn was massive and range at speed was like 250-300 miles. But, marketing says that boat has to have that speed capability whether actually useful or not.
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Old 08-22-2012, 02:22 PM   #48
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THD wrote:
"The marketing angle is lower power, fuel efficiency." Disagree big time. Trawlers are still very over powered just like S DeAntoino says. But the biggest problem with efficiency is the hull designs. They are designed for space, stability and the ability to carry weight. Most of our trawler boats are going at displacement speeds but don't have displacement hulls.

Fuel is still too cheap. If it was too expensive trawlermen would be scrambling to snatch up the few boats that are displacement like Krogens and Willards. When fuel gets expensive people will start repowering w smaller engines and avoid buying boats that are'nt full displacement. Until such a time fuel will be too cheap and boats far less efficient than they could be.
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Old 08-22-2012, 02:30 PM   #49
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The whole overpowered thing is really based on what the market wants.

The fact is that most people that can buy a $500K+ boat work really hard and have less free time than they'd like. The bigger engines are a result of meeting the demand for speed from potential buyers of these new boats.

If we look, the market for full displacement boats has really morphed into a market for retired people that want to explore the world. Thats why the krogens, and nordhavns are doing so well. These are expedition boats, vs the boats purchased by still working people are recreational boats.
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Old 08-23-2012, 02:09 PM   #50
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By stating that "virtually all displacement hulls are way overpowered", he seems to be saying that the engineers who design these boats don't know what they are doing. That puts him at odds with dozens of boat manufacturers. It makes me wonder.

Engines are bought by the purchasing folks , looking for the "best deal".

Oversized is "boob bait for the bubbas" that have ZERO concept of diesel engine operation.

What HP the NA specified for a certain service , and what was cheap and availible (usually on credit till the boat is sold) may differ .

Custom boats are usually far better done than cookies, even $2,000,000 cookies.
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