On Mar 5, 3:53 pm, wrote:

Well, Steve, the tree I live in is the one behind my machine shop.
The reason that I will not put a wet stack on the boat does, in part,
involve the 488 pounds that the British Company sells them for (I
don't know how much that is in real money, but suspect it is in excess
of $1000US). Secondly, I have a few of the 1.6L diesels in my
inventory, and as I will not water ski behind the boat, I think 52hp
is adequate to my task, and more reliable and fuel efficient to boot
(I've rebuilt ten of these little engines in the past 5 years)...In
fact, if I had one of the newer diesels available to me, I would
still use the 52hp model. As the boat (18' open runabout, aluminum
hull) will be both trailered and occasionally beached on sand bars,
and as I don't want to pierce the hull or transom to build a cooling
system, the close-coupled radiator system mounted on the injector pump
side of the motor looks like a viable method, and the system's entire
footprint will
be less than 32" wide....Oh, did I mention that this was to be a work
boat? What I am looking for is reliability, safety and fuel
efficiency...speed, resale value, and the approbation of the boating
community are not issues.

He probably means the VW TDI engines, which need a computer to run,
and provide much less that 100HP on marine applications, (@2750 RPM,
aprox.). I googled 'vw wet exhaust', and here is a link to a wet
exhaust you could use for much less weight and cost that you state:
http://www.frenchmarine.com/Content.aspx?Content=9

Embedded are links to particular products and also to VW's SDI engines
(I guess they are direct injection, not computer needed).

The reason I mention the computer is that is a really bad idea to have
essential electronics that close to salt water.