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Old 04-12-2002, 05:03 PM
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V12 Marinizing?

Does ANYONE have any ideas where I might be able to get some advice on how or where I can try and marinize an engine to utilize it for marine use? I know that there have been many Chevy 350's used in the marine application. But where would I find out how to marinize a v12? Say out of a Jaguar? Any ideas? Thanks.

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Old 04-12-2002, 10:18 PM
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Very expensive to do because you need stainless watercooled exhaust manifolds as well as sacrificial anodes in the water jacket to use freshwater or sea water for cooling. The entire cooling system has to be redesigned unless you want a radiator sticking out of your boat or snowmobile type heat exchangers on the hull.

Carburators need to be altered due to the pitching motion of the waves unless you go fuel injected and then you need to figure out a stern drive or prop shaft arrangement and coupling method. I won't even mention the fuel filtration, custom mounts, stainless valves for salt water use and a million other things that need to be custom engineered. Not impossible but could get very expensive. If you can make all your own parts it helps a lot but it means you would be reinventing the wheel. Ever seen what a custom prop costs to have made? You will need one to fit your application?$$$$$$$$$$$$!

Air cooled engines are easier but then you need to figure out ducting etc. Although the preengineered systems seem expensive they really are not when you consider all the details.

It would sound awesome though!
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Old 04-13-2002, 08:17 AM
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Boy, that's disappointing to hear. Looks like another project will have to go on hold for a while. I thought that it might be a bit easier than that since there are already so many converted 350's out there. Thanks for the reply though.
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Old 04-13-2002, 10:13 AM
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Many of these "conversions" are poorly done and result in a boat that is worthless after a few years, I have seen a few. A lot of them are alright for freshwater due to less corrosion problems but few I have seen compare to a purchased system for durability and performance, usually the fuel consumption on these cheapo's are horrific because they don't engineer the cooling system properly and the engine just never gets hot enough to perform properly.

Don't give up yet, it is not impossible just difficult. You would be best off looking at a professional installation and taking some keen notes, you will need to note things like removable frostplugs to facilitate draining etc.

Here is a site that answers question about fresh water cooling.

<a href="http://i-netmarine.com/fwc/questions_fwc.htm" target="_blank">http://i-netmarine.com/fwc/questions_fwc.htm</a>

What kind of boat are you thinking of doing?
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Old 04-13-2002, 04:09 PM
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Thanks again for yet more information and the website. I'm tossing around the idea of a classic wooden speedboat, and thought that this would make a really nice custom and classy boat for a freshwater lake. Falconer makes a marine v12, but they too are MANY thousands of dollars. I'm going to keep searching for ways to try and get this done. Thanks again. If I make some progress I'll post it.
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Old 04-13-2002, 05:33 PM
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Here's a site that sells jet drive that you could adapt. They seem to be racing oriented (what the hell might as well be the fastest on the lake and able to go anywhere)

<a href="http://www.aggressorjetdrives.com/" target="_blank">http://www.aggressorjetdrives.com/</a>

Here's a link to a manufacturer of surface drives, top notch and high end performance. This type is easily adapted to different powerplants. This is probably your best bet as the majority of the components are outside the hull and self contained which leaves more room in the boat. Many different sizes to choose from.

<a href="http://arneson-industries.com/Arneson%20Surface%20Drives.htm" target="_blank">http://arneson-industries.com/Arneson%20Surface%20Drives.htm</a>

Good luck, keep us updated.
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Old 04-14-2002, 07:06 PM
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Mercruiser used Lambourghini ,my spelling sucks,for power in the mid 80s. Don Johnson set the New Orleans to St Louis river record in a Wellcraft with twins. Your project isn't out of the question by any means,but you need some deep pockets to do it. Go to some of the offshore performance web sites and look at how they plumb their engines to get some ideas as to how it is done. Stay with Mercruiser drive systems, they build anything that you could ever want. It all depends on how much power you want to put to it. A marine fuel system is basicly the same as automotive,the difference is fire hazard related, not in the way it works. Cooling isn't a problem as long as you flush the system after salt water use,you could use a heat exchanger if wanted and they aren't hard to find if you know where to look. Exhaust will be the most difficult to take care of,and could easily cost 6-8 grand per engine. I would recomend someone like CMI or Stellings. The thing to remember is engine cooling water cools the exhaut tubes then exits the system through the exhaust. What you want to do is not easy,but certainly not out of the question. Good luck if you decide to try it.
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Old 12-05-2013, 05:37 AM
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well I have almost finished Building a classic wooden boat and have almost finished marinizing the jag v12 and it is not as hard as seems to be made out .
Glen-L.com • View topic - Riviera powered by v12 jaguar
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Old 12-05-2013, 06:33 AM
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jenko this post is 11 years old.
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Old 12-05-2013, 11:06 AM
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Originally Posted by flugzoid View Post
Does ANYONE have any ideas where I might be able to get some advice on how or where I can try and marinize an engine to utilize it for marine use? I know that there have been many Chevy 350's used in the marine application. But where would I find out how to marinize a v12? Say out of a Jaguar? Any ideas? Thanks.
This is a place where you need to be more definitive, what you can do for a drag boat is a lot different from a cruiser. don't forget that state and Federal regulations will appy so both need to be checked.

Bogie
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Old 12-05-2013, 01:08 PM
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jenko this post is 11 years old.
just thought it might still be of interest
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Old 12-05-2013, 01:13 PM
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What a piece of work! Any idea what it weighs? Is it an iron block?
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Old 12-05-2013, 01:21 PM
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What a piece of work! Any idea what it weighs? Is it an iron block?
with borgwarner 72c and vdrive it weighs 340kg and the block is aluminum
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Old 12-05-2013, 01:39 PM
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Approximately 750 lbs., not much more than a BBC, motor only. That's surprising.
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Old 12-05-2013, 05:19 PM
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just thought it might still be of interest
not knocking it at all. that v12 is looking killer!!!
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