From: jackbadger56 on
On Feb 27, 2:33 pm, "the_dawggie" <the_dawg...(a)hotmail.com> wrote:
> On Feb 23, 2:00 pm, "jackbadger56" <castl...(a)gmail.com> wrote:
>
>
>
> > At some stage in the next few years we're going to have to re-power
> > our boat as the twin SD33's are pretty tired. I was thinking (just
> > thinking!) that fitting modern twin 4cyl turbo-diesels would be worth
> > exploring. We've yet to get quotes on the Nissans but I'm sure it will
> > cost a fortune simply because it's for a marine application (diesel
> > fuel at all the marinas in Pittwater charge about $1.70 per litre, to
> > give you an idea of what they can get away with). If we were to use a
> > heat-exchanger set-up rather than pumping seawater through them, would
> > you really need to do a great deal of modification for marine use? The
> > 'engine room' (wow, that sounds grand!) is pretty well sealed and
> > there is heaps of room, so maybe any computers etc can be located well
> > out of harms way. Two of the marine mechanics I've put this to seem to
> > think it should be OK in theory, but had never put any thought into
> > it, as they had never been asked. They weren't keen on the idea
> > basically, but couldn't really give me a reason why. Has anyone here
> > had experience in fitting stock car engines into boats? If so, do you
> > think this is feasible?
>
> > BTW I've looked for an 'Aus.Boats' to ask this, but am also interested
> > in what 'car-heads' think of this idea. Traditional boaties are just
> > too blinded by......well........tradition, and would be horrified at the
> > thought of doing this to a 60yo Halvorsen (despite the fact that it
> > currently has Nissan truck motors, which in turn replaced a pair of
> > Holden sixes!)
>
> Ok, I've lived by the sea for all my life, and had a number
> of boats.
>
> That would range from outboards, to a yacht, to ...
> nothing ATM (got shites with).
>
> A friend had a largish boat at Pittwater IIRC with a
> petrol engine in early 1990s. Don't even want to
> go near how much petrol the thing needed - not
> feasible these days. I had a Chrysler 130 HP outboard
> I rebuilt for the boat I had too around then. It chewed
> fuel like I don't now what. Fairly powerfull at the
> times it actually worked though.
>
> Diesel engine idea is good. Depending on what
> you use, they are heavy engines.
>
> What you have to figure on is getting the boat up
> to speed on a plane, I think a diesel would be good
> at it. A turbo diesel certainly would be.
>
> Plough along with much water resistance, with
> a petrol engine and yeah, you gunna use fuel.
>
> In a diesel, I'm suspecting you are going to use
> less fuel than a petrol guzzler.
>
> ... and there is the biodiesel option
>
> Heck, ships use the biggest diesel engines (and
> most powerfull) engines ever built in the world .. it's
> gotta be all good.
>
> I'd be wanting to consider salt conditions.
>
> Car diesel engines should be generally good with it,
> however some components might not like being in a
> marine environment all the time, and *certainly* might
> not like sea water as a coolant. Set up a radiator with
> proper coolant arrangement would be better.
>
> Unless a proper off the shelf kit of engine and parts
> in mind for a boat, it would be a lot of work, and a
> few oooops, "tweak that and this a bit" moments I
> would think.

True, it's a bit more complicated than first appears (e.g. the need
for manifold cooling). We've got some time up our sleeves so plenty of
time to consider options. I'm the only one of the 6 owners who seems
to want to consider doing anything other than showing up at a "boat
place" and and saying '2 new engines please; need it for the
weekend'!!

BTW I'd like to see a 60 year old, 40 foot Halvorsen on a plane.......