Diesel in a Donzi

[adam d.]

I have found an engine that could be used in the 19 Hornet. Anyone ever used a turbo diesel in a donzi? Can I get the performance? I am trying to get the specs on the engine, but it is sitting in a yard right now, and big thing is its FREE.

[gcarter]

It seems like the Europeans were allways big on turbo Diesels on race boats. A lot of them were Ford based. About 600 to 800 HP and about the same weight as a BBC. This was about ten years ago.

George Carter

[MOP]

There have been threads up here about diesel Donzi's! A 22 Classic and a Sweet 16 both had Yanmars a 6 in the 22 and a 4 in the 16. I am not to sure of the stats on the 22, but did read the 16 article several times. Range on 30 gal fuel went from 90 nautical miles to 300, the owner had it as a tender on a yacht. The 22 has been seen by several other members, it seems as if it ran good just sounded dumpy with one big pipe. One of them sholf chime in.

Phil

[Kent Perroux]

Adib Mastry (of Mastry Engine Service in St. Pete. Fl.) put a Yanmar 300 inline 6 /Bravo on a 22.

Hot Boat MAgazine did a test on it about 5 years ago.

Kent

[pmreed]

I talked to the Yanmar people at the Miamuh Boat Show. They said it ran middle 60s.

Phil

[Craig]

Here's a neat article related to Deisel vs Gas power:

http://www.yachtsurvey.com/GasDiesel.htm

Makes some interesting points.

[gcarter]

I guess this could go in a larger Donzi.......and it's 1200 HP ;)

http://www.seatek-spa.com/racing_gb.htm

If I remember correctly, Fabio Buzzi was instrumental in developing these engines. He knows a bit about diesel racing engines.

George

[MOP]

I have found an engine that could be used in the 19 Hornet. Anyone ever used a turbo diesel in a donzi? Can I get the performance? I am trying to get the specs on the engine, but it is sitting in a yard right now, and big thing is its FREE.

Post what you do know about the engine including any numbers on it, one of us may know what it is.

MOP

[biggiefl]

I know this is old but since I got my 22 I just keep remebering the black/white 22 yanmar I saw at the Desoto fishing tourney back when. I remember it was pretty darn steep in price but you could cruise at like 50 burning like 6gph....don't know if it would justify the extra 20?g's though. Has anyone seen one or know of a writeup, etc? Here is something new coming out. http://www.boats.com/blog/2011/03/marine-diesel-ready-for-runabouts/ Don't know if 265hp is enough for a 22 but would be fun with a 18. If I remember it weighs about the same as a SBC. Cost could be crazy along with getting parts down the road. I doubt your VW/Audi dealer will handle manifolds and risers for it.:hyper:

[joseph m. hahnl]

The XSR48, produced by British-based XSMG Marine, is capable of speeds in excess of 100 mph with real race boat handling. But style has not been sacrificed for speed. The XSR48 combines the DNA and high performance of a supercar with superyacht styling to create the world's first true superboat.


http://farm4.static.flickr.com/3318/3518231454_34c51ddb20.jpg


http://www.youtube.com/watch?v=jsagDKpbc3w (http://www.youtube.com/watch?v=jsagDKpbc3w)

[Ghost]

If you found a diesel package that was sized properly (reasonable HP without way too much weight) I'd estimate 2.5 - 3 MPG wide open, mid thirties cruise at about 4.5 - 5 MPG.

[zelatore]

I'd say you should be able to hit those numbers. The right hull/engine package of course is the key. Typically, I see about 25% better fuel consumption on mid-size (35-ish) boats when comparing gas and diesel. More in bigger boats and less in smaller ones.

I don't have any good back-to-back comparisons of the same hulls, but I just ran the numbers on a couple of new Sea Rays we got in; a 310 Dancer with twin 5.0s and Axius drives (fancy bravo IIIs) and a 450 Dancer with Cummins Zeus pod drives and 480 hp diesels. Despite the huge difference in power and boat size, the 310 was only about 40% more efficient and and a much lower speed to boot.

Best cruise, 310:
3500 RPM, 28 MPH, 19.8 GPH, 1.41 MPG

Best cruise, 450:
3000 RPM, 35.6 MPH, 35 GPH, 1.02 MPG

For reference, if we ran the 310 up to 35 mph (4000 rpm), it was burning 27 GPH netting 1.3 MPG

Of course, if you really wanted maximum efficiency, the 450 was the way to go at low speeds. The longer hull and diesels made all the difference. At about 5.5 mph, she was getting 3.5 MPG while the best the 310 could manage was 1.8 MPG at 3.3 MPH.

I've attached all the numbers in an excel file. Looking at them also really highlights the huge dip in economy as the boats come up on plane - those are the least economical speeds for either hull.

<edit - I can't attach excel files>

[VetteLT193]

I went to college with the daughter of of Richard Mastry... had a few talks with with Richard over the years about various projects.

The 22 with the Yanmar had an awesome cruise. It wasn't very fast top end but you could easily run it 60 all day long. lo

Overall it didn't make a whole lot of sense to me. It's hard to put a ton of hours on a classic in both daily seat time and yearly+ long term time. They just aren't that comfortable for long running. So the benefit of diesel (longevity, better mpg) doesn't outweigh the down side (slower, up front cost is insane).

[biggiefl]

From what I have read the boat did about 60 but cruise was like 50 and burned very little. Again these were for tenders for yachts, I doubt many or any were bought by consumers for runabouts....if so they would be here.

Read this from here years back...might give more insight:

http://www.donzi.net/forums/showthread.php?23509-rough-water-capabilites-of-22-classic