Details aside... WANT!! Given the number of hours I will probably spend listening to this damn thing, it would be really nice to have one that sounds cool!
Old Listers go forever and then some, but parts are starting to become expensive and atleast on the petrol models, parts like replcement bearings are a problem. You want to bear in mind that Marine engines are actually designed to be serviced in the boat and most bits can be accessed from above. Russel Newberry? http://www.russellnewbery.co.uk/engines.html
Did you go to the southampton boat show? Or the London one? They have engine vendors coming out the ears! Best source of knowledge ever....
Cummings 4bt would also be my choice, the standard one used is about 2k or so. BTW by used I mean under 60k on the clock from a large van. That is a spit in the bucket for that engine, barely broken in. It is a non intercooled engine. I would put an intercooler on it though as that really wakes them up as far as power end eficiency. If memory serves right, the engine makes peak power @ 1700rpm. Which is not a big deal to reduce to 600-700rpm, you could also have it serve dual purpose as a generator as you could put a generator head on it on the crank snout. . Get a manual trany and leave it in gear. In marine aplications egts are the enemy, so put an egt gauge on it, the loads are much higher than people think so that leads to egt problems. A 1.9L vw engine would die a very quick death in a boat. In a boat there is only one way to go, IRON. If its not made of it and made heavy, it wont live. As for the detroid 6-71? Yes its loud, and yes it will consume oil, but that's by design as they are two stroke engines. However the reliability of a 6-71 is legendary especially in harsh environments. Reason for their loudness is because they were designed for off road vehicles (read military). Their toughens is the reason the military used them. however on a power cruiser, they are not the right choice. They use multiples of those 6-71 or even 8-71's on speed boats with turbochargers on them ontop of the supercharger.... Twin charging.....
I have actually looked at some of the Cummins used engines and some of them have over a million miles on them, so yes, 60k is nothing. I'll take a look at those. I've been talked into using a controllable pitch propeller rather than a full marine gearbox (a reducing gear will still be necessary) What is the cause and solution of the EGT problem? Is this a total engine cooling issue or just a few parts? I'm planning to use a keel cooler rather than an open circuit design to reduce maintenance headaches. And of course, someone told me about a 36-ish foot fiberglass hull I can have for free. I'm going to go take a look at it soon, which could throw the entire project up in the air. EDIT: I looked at the Russel Newbery site and emailed them, but from what I've read their small ones are about $50,000 and impossible to import to the US because of emissions regulations. Thanks for the lead though I know this is probably a bad idea, but can someone tell me why it's a bad idea... I know that some large locomotive engines are built with removable cylinders that bold onto a separate crankcase, er, thing. What if someone were to build a custom crankcase and bolt on one or two of the cylinder assemblies to make a 1 or 2 cylinder engine?
im not overly familiar with marine diesel cooling, but i know many gas inboard/outboard engines use raw water manifolds that pipe water through them to cool the exhaust: im not sure how one would implement one of these with the turbo also being a factor, as you want the heat to reach the turbo - so cooling the manifold is out. im also sure there arent any cummins 4bt marine exhaust manifolds laying around, so it would be a custom job anyways. most modern turbos have water cooling passages in them, so youll want those plumbed in for sure. i wonder if wrapping the exhaust would be sufficient to keep it in the pipe until it leaves the engine bay...
There are quite a few people running Mercedes OM617's or OM603's as boat engines. They are virtually indestructible. 1 million miles on the same engine is not uncommon. I have an OM602.912 250D with over 540K miles in it at the time of writing. And I'm driving 160 miles every day in it still. Or buy a Yanmar diesel.. Couple of links: http://www.lancingmarine.com/ http://www.peachparts.com/shopforum/showthread.php?t=99369&page=2
I did some searching while I was board. If you really want to use an old low rpm motor, I think your best bet would to use a Kelvin engine. I don't know too much about them but they seem to be pretty much bomb proof from what I heard. Though you will have to make a sacrifice in your hp requirement, as most of these motors are around 80-90 Hp, but remember at the low rpm they run at they will have around 600-800 ft-lbs of torque. So it will definitely get you moving. But be prepared for the more "fiddly" nature of these engines... The kelvins I have found so far have been based in the UK so maybe one of the people on here could aid you in shipping if need be . Otherwise search around and I'm sure you could find a better deal/location than what I found. Couple of interesting videos http://www.dieselenginemotor.com/diesel/engines/1050,1.html http://www.apolloduck.com/display.phtml?aid=128108 http://www.apolloduck.com/feature.phtml?id=154589 Best of all These might actually be somewhat plausible to fit in your boat. Especially the 2 cylinder version of these. At any rate good luck , and have you made any progress on this at all?
I LOVE that second video! Thanks for looking that up for me, I appreciate it! Still in the planning stages. I have a design I like but it will be next year before I can do anything about it. I also need to find a job and figure out where I'm going to be living as well. you know, details.
those blowers cant possibly be doing much at that low of a speed... but i guess there are 12 of them...
One word... Gimmick Being a Detroit it probably leaks oil as fast as it burns fuel! On the topic of the absurd, I've got a line on a free 60' Halibut schooner in Seattle. Not sure if it would make it up here, but I may go take a look at it. http://www.boneyardboats.com/Archives/0050_Winter_2011/1925_HALIBUT_SCHOONER_60/SILVER_WAVE.aspx
