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Old 10 April 2011, 06:47   #1
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Country: UK - England
Town: Surrey
Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
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Marinising BMW 3.0 Turbo diesel

I am in the process of fitting a BMW 3.0 turbo diesel into my RIB. This is the same engine as used in the 2003 Range Rover (latest shape) and BMW530D. I totally stripped and rebuilt it (didn't really need anything doing) and have modified the ECU to work without the usual car stuff around it, (alarm, immobilser etc) have fitted a larger Turbo and injector nozzles and have remapped the ECU to run around 270 BHP @ 4000 RPM. I would be interested to hear any suggestions of potential problems I could be facing, using it in a marine environment. The RIB is glassfibre, it will be connected by a double CV jointed propshaft to a Castoldi 238 that has 10 or so anodes. I originally was going to cool the engine with a heat exchanger and salt water doing the cooling, but it will spend most of its time in and around Chichester Harbour where there is a fair amount of seaweed to get sucked in. I am now considering mounting an aircooled radiator above the jet on the outside of the transom with a couple of ducted electric fans doing the cooling. This should avoid the problems of seaweed blocking the intake. Apart from the obvious potential issues sealing all the electrical connections, are there any other issues I should be considering?

I have been trying without luck to find out about whether electrolysis is going to be an issue. Most of the articles I have read seem to mostly concern mooring on a jetty using a powerline for electrics. The RIB will live on a trailer when not in use and will be thoroughly washed off after each trip.

Any advice would be welcome.
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Old 10 April 2011, 06:54   #2
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Country: UK - England
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Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
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Brilliant engine IMV.

Vector Mirage (ribnet member) is the man to talk to. He's a smart motor engineer who has fitted and heavily modified a Ford Cozzy lump in a rib.
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Old 10 April 2011, 07:02   #3
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I seem to remember reading an article about BMW engines being used in a race boat - it was in RIB Magazine maybe 2-3 years ago. There was something about having to cross-brace the blocks otherwise they would let go where the engine mounts attach. May only be relevant to race boats and sorry I can't recall the details but I think it was the same engine - may be worth looking into anyway?
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Old 10 April 2011, 07:26   #4
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Country: UK - England
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Boat name: Fugly & Rokraider 1
Make: Pac 22 & Porter 6.5
Length: 6m +
Engine: Ford 250 & jet,DT140
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Thanks for your comments. I believe the race boat was using a pair of the later spec engine that has an aluminium block. I spoke to Paul Lemmer (spl?) who was on the RIB doing the Round Britain. Apparently they were a lot more economical than anticipated but, as I understand it, the blocks cracked due to the constant crashing up and down. (incidently, Paul built my BWM Sea Explore RIB).
I am not building this boat for high speed, more as a useful tug for towing groups of dinghies in, when the wind drops or the conditions are difficult to get them back into Chi harbour.
We are hosting the Flying 15 worlds in July and they are heavy boats to tow, the 4.7 club RIBS with 50HP outboards can just about do one at a time in reasonable conditions. If the wind drops we will be facing getting 150 boats in from the Bay.
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Old 10 April 2011, 08:34   #5
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Country: UK - England
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Engine: 10hp Yam / 150hp opt
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Exhaust manifold / turbocharger / exhaust cooling? It's going to get hot in that engine box!

Radiator will need to be quite big and have good airflow - but a radiator specialist should be able to advise what you need.

If you've only got freshwater / antifreeze mix going round the engine I can't see corrosion being a problem. The engine is not getting near the sea.

One of the 260hp Yanmar engines is based on that engine.
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Old 10 April 2011, 14:05   #6
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Country: UK - England
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Make: Atlantic 21
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Engine: Mariner 2.5 v6
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Posts: 44
Yer the 6by.
If your going down the rad root why not try keel cooling.

Cheers Josh
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Old 10 April 2011, 15:12   #7
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In the usual marine setup, the heat exchanger cooling sea water is dumped into the exhaust, primarily for cooling the exhaust to manageable temperatures but thereby also silencing the exhaust. Your turbo charger will give some silencing. You are going to seriously consider the lagging of your exhaust system to prevent a fire. My inboard installation, unlike a car engine, does not use earth connected to the engine block this is to help prevent corrosion because the block will connect to the sea water via the drive. The upshot of this if you wish to go that route, is to have an alternator and starter motor which has an isolated earth.
Another thought is the long term corrosion resistance of your radiator since the large airflow you will require is pretty much bound to contain salt water moisture. I suppose a car engine does too during the winter time so maybe it's not such a great concern.
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Old 10 April 2011, 15:50   #8
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My local radiator company build some copper and brass cored radiators for use on marine based equipment, such as cranes etc. They make their own cores from scratch and reckon they can build me a core that should last for a fair while in a salty environment.
I have found a company that makes a purpose built muff to go around the turbo and lags the manifold and exhaust. I am planning to have a very short exhaust run straight off the turbo and out through the transom. I may put a small stainless steel cherry bomb in the system to take the edge off the exhaust note. One area of concern is keeping sea water ingress out of the exhaust when the engine is switched off. I have a vacuum pump on the engine that could operate a diaphram that holds a flap open when the running and a reasonably strong spring could hold a flap shut when stationary.

Have been considering some sort of keel cooler system, but I think the aircooled radiator route is the simplest at this point.
I design and build 4x4's for a living. We often put the radiator in the rear to stop it getting blocked with mud when in the serious poo, where it gets no direct airflow. I regularly cool 250 -300 BHP using this method and don't see why I can't apply it to the RIB. If it doesn't work I will have to consider other routes.

Haven't got my head round the reason for giving the alternator and starter its own earth. I haven't found an article that explains the ins and outs of it all.
As I have to build a flywheel from scratch, I have been considering fitting an insulator/ shock absorber that would be incorporated between the flywheel and propshaft. This should prevent an electrical circuit between the Jet and engine.
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Old 11 April 2011, 05:21   #9
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I have a BMW 2.2 petrol. This engine is an ali block and head. I dont know about the 3.0lt dsl engines. but if it is an ali block be very careful of overheating. If the engine is ali block and head and it gets over headed it is for the bin.

TSM
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Old 11 April 2011, 11:54   #10
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Engine: Ford 250 & jet,DT140
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Quote:
Originally Posted by two stroke mick View Post
I have a BMW 2.2 petrol. This engine is an ali block and head. I dont know about the 3.0lt dsl engines. but if it is an ali block be very careful of overheating. If the engine is ali block and head and it gets over headed it is for the bin.

TSM
The 2003 model that I am using (M57) is a steel block, so hopefully will be a bit stronger than the aluminium type. It would have been nice to have the lighter ali block for the weight saving, but they are at least twice the price to buy, being a newer model.
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