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#11
posted to rec.boats.building
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Boat Engines
I understood continuous duty to mean not only an ability of the engine to
run reliably for extended periods at full load but also that all the metalwork, fittings etc are of a superior standard. Hence the cost. I may be wrong here but I seem to recall that running engines off load or on reduced loads for extended periods is not good for them. Leads to glazed barrels or something like that???. Referring to air cooled, I rather like the smell of engine rooms but I can see on a boat you would have to build in a heat exchanger to isolate the cabin from the "raw" heated air, I just think that a heat exchanger for air is easier to build that one for a sea/fresh water combination. Also no holes in the hull. However on the down side, don't water cooled engines run quieter than air cooled. So many points to consider!. Having said all of the above however I believe that the engineering required is beyond me and by the time I gather the experience and tools to do the work too much time will have gone by!. I will just have to save a bit harder and buy a marine engine. Steve |
#12
posted to rec.boats.building
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Boat Engines
I was going to suggest talk to Polar Engineering, but they have closed
and Bowman have taken on their product range. http://www.ejbowman.co.uk/news/News_polar.htm From my research when I was looking for a marine engine, the only difference between continuous and intermittent rating is the power allowed and duration. I bought a Daewoo L136 from Watermota UK - 160Hp at 2200 rpm continuous rating. Excellent engine, very reliable, frugal and well priced and this particular engine is used when re-engining trawlers whose Gardners are beyond economic rebuild or repair. Daewoo do a 70 Hp engine - http://www.watermota.co.uk/daewool034.html Give Mike Beacham a call - you might be surprised!! Colin Stone |
#13
posted to rec.boats.building
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Boat Engines
max camirand wrote: If air cooling didn't work out, you could remove the radiator and instead pump the coolant through a coil of copper pipe running through a sea chest (small seawater-flooded compartment built inside on the inside surface of the hull). Kind of like a keel cooler, but inside. The advantage over cooling with raw seawater is that you don't get corrosion inside your engine, both from the seawater and from the galvanic action it creates between the dissimilar metals in the engine. Of course, it's slightly more complicated. Why bother with all that complication. Just go on E-Bay and search for "Heat Exchanger" and you will find a plethora of all sizes and shapes. Then add a raw water pump on a bracket, some plumbing and replace the radiator with the heat exchanger. |
#14
posted to rec.boats.building
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Boat Engines
max camirand wrote: snip To get around the gearbox problem, why not couple the engine to a hydraulic pump and use a hydraulic motor with a thrust bearing to drive the prop shaft? With a short run of hose, I don't know if the energy lost would be great. You could use your main engine to power a bow thruster that way, too. Just a thought. -Max Camirand Sounds like a good plan, but I think the cost will bite you. You will need to engineer the pump, motor and prop combination. You might best fund a college research program, or ask around the fishing docks. Oh yeah, all that pumpery will be heavy. Terry K |
#15
posted to rec.boats.building
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Boat Engines
Have a look at www.abato.nl,
a Dutch company that imports Chinese made Deutz 226B marine diesel engines. Weichai Deutz Engineering co, joint venture. Deutz moved the production line of the 226B diesels to China, a few years back. Quality control is still executed by German engineers, in the Weichai plant in China, so they say. Text on this website is in Dutch, but you can find some interesting links. 75 hp model costs 4300 euro, excl. VAT.(without gearbox). Pricing is more than OK, I think, but about reliability I haven't heard anything yet, it's too soon for that. If I ever need a diesel, I think I'll go for it. Beats a truck engine marinised by an amateur! Bye, Luk "Steve Morrisby" schreef in bericht ... Hi there I have been looking at the UK market for a 75HP marine inboard engine. Those that look good are products from Volvo, Betamarine and Lombardini, but what a price!. I struggle with the fact that my new car cost less than one of these and that got me to thinking if I could do it myself. What are the pitfalls in "marineising" a good used truck engine, are aftermarket kits sold and what about marrying the gearbox to the engine bell housing. I seem to recall reading a thread on this subject some years back, but at the time I was not too interested. Now of course I cannot find threads going that far back. TIA Steve |
#16
posted to rec.boats.building
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Boat Engines
On Wed, 13 Dec 2006 23:26:21 +0100 Heidi&Luc
) wrote: Have a look at www.abato.nl, a Dutch company that imports Chinese made Deutz 226B marine diesel engines. Weichai Deutz Engineering co, joint venture. Deutz moved the production line of the 226B diesels to China, a few years back. Quality control is still executed by German engineers, in the Weichai plant in China, so they say. Text on this website is in Dutch, but you can find some interesting links. 75 hp model costs 4300 euro, excl. VAT.(without gearbox). Pricing is more than OK, I think, but about reliability I haven't heard anything yet, it's too soon for that. If I ever need a diesel, I think I'll go for it. Beats a truck engine marinised by an amateur! There are english datasheets available. Before 1985 it was a MWM engine, Deutz bought MWM in 1985: http://www.deutz.nl/historie/1980-2000.htm and Fendt also used these engine types - D2xx range: http://www.fendt-freunde.de/datenbank/fs_dat1.htm Compare these pictures: http://www.abato.nl/motoren/images/w...z/_BHF0191.jpg and http://www/cgi-bin/foto/436/50.jpg I dont't have a picture from exact the same angle, more pictures at http://www/cgi-bin/cath_pub?5 -- Richard e-mail: vervang/replace invalid door/with NL.net |
#17
posted to rec.boats.building
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Boat Engines
Thanks to everyone for those links to other suppliers and for your
comments. They were all well noted!. Yesterday I talked to my car mechanic about continuous duty engines. He said they did not really exist but likened it to aero engines which are required to run for long periods at a time without missing a beat. "Yes" he said "they are built to exacting specifications and components are replaced after a recorded period long before they fail." "What about old VW and Subaru engines which are used in home builds" I asked "They are usually rebuilt or modified by dedicated and highly competent amateurs and maintained to a very high standard" the mechanic replied. So. A continuous duty engine is one that is well built (ie almost any new engine) and maintained to a high standard (hey I do that to my car already). It's all in the maintenance!. Steve |
#18
posted to rec.boats.building
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Boat Engines
"It's all in maintenance". We may differ slightly on that position. You
will find that an engine built for auto use has a much different camshaft than does one built for marine use. It is understandable if you visualize the difference in acceleration in each application. Automotive cams do not provide good marine performance. I have proven that several times with Chev 350's auto engines placed directly into marine applications (I/O). Don Dando "Steve Morrisby" wrote in message ... Thanks to everyone for those links to other suppliers and for your comments. They were all well noted!. Yesterday I talked to my car mechanic about continuous duty engines. He said they did not really exist but likened it to aero engines which are required to run for long periods at a time without missing a beat. "Yes" he said "they are built to exacting specifications and components are replaced after a recorded period long before they fail." "What about old VW and Subaru engines which are used in home builds" I asked "They are usually rebuilt or modified by dedicated and highly competent amateurs and maintained to a very high standard" the mechanic replied. So. A continuous duty engine is one that is well built (ie almost any new engine) and maintained to a high standard (hey I do that to my car already). It's all in the maintenance!. Steve |
#19
posted to rec.boats.building
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Boat Engines
"Contiuous Duty" Sure they exist. Go check out John Deere's line of
marine diesels. They have them available in various duty ratings, including continuous. And you bet it's all in the maintenance... give them clean fuel and air, and keep the oil clean and they'll run damm near forever. |
#20
posted to rec.boats.building
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Boat Engines
Ah aren't good news groups great!. I have learnt more on this subject over
the past weeks than I ever would have at a trade show or from a series of manufacturers sales brochures (and they are very good sources of information) I kinna guessed there was a little more to the subject of marine engines, but not how much. There is now no doubt in my mind that to do anything but buy one from a reputable source would be a big mistake. Again thanks for all your input Steve |
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