Inboard Diesel Jackshafted Vs. Twins on a Seamark

[Snookerd]

As some of you know, I have a 23SF that was originally a diesel inboard. Currently the boat is bracketed with an Aluminum bracket with twin 225's with the prop pocket glassed over. This is a future job, but I am rebuilding the boat with one of these choices in mind. Even if I rebuild the original transom myself, the cost of the new bracket, motors, rigging, ect. is around 30K. Since I already have the stringers and motor bay intack, and the old saddle tanks still in place I would not have as much retro-fitting. I would then, not have to rebuild the transom and would have a transom outdrive for a more efficient prop position for speed (40+ knots)and the benefits of trim/tilt here where it's shallow all over the place. I am thinking of the efficiency/lower center of gravity and better boat balance/Ect.. I think my price would the same or less with the diesel. I understand about the outdrive seal sitting in the water. I am looking for responses regarding initial cost, maintenance costs, boat balance, and resale.

[peterb]

Danny,

What's going on? I thought that you would have the boat in the water by now.

What's your current time table?

Peter

[Snookerd]

Peter- The 18SF just got picked up today .
My buyer is trailering it to South Carolina. I wish I was using the 23 now. Investment House sale fell through. I will use the 23 as is, but am planning the big overhaul down the road. I will be getting good use of the boat starting very soon, but I am thinking long term. I am soliciting feedback on my best served plan for the "highest and best use" in that 30K area.

[Miles Offshore]

My neighbor had one of the jackshafted 23's back in the eighties and although he had problems with the universal joints on occasion the overall performance of the boat was very good. I dont remember what the numbers were though.

[kerneltugboat]

Snookered,

I can tell you from experience, putting in a Jackshafted Diesel is an expensive proposition, but in the long run I think it will pay off. My engine alone was in the 30K area,(D6-350). Mine is a 27 and is almost done. I had an inboard 454, with no pocket, but the hull was cut flat with a 24" PAD. I ended up installing new Stringers for the Engine mounts, and beefed up the original Seacraft stringers as well. My boat is still at the glass shop, a 2 week Paint job has turned into a 2 month Gelcoat Job. I am hoping to splash her by Labor day in time for Tuna. Then I can let you know if it was worth it. If I had a 23 inboard, and the pocket was glassed over and the Engine mounts were good, and the fuel tanks were ok, then I would drop in a VP D3 Jackshafted to a Composite or Aluminum DP drive.It is an awesome little package that weighs about 720 lbs (+ the shaft weight)maybe another 80 pounds. I think you would be looking at 30 Knots top end, cruise at 25 and get better than 5 MPG, that is just a guess from everything I have read.

Good Luck !!!

[Snookerd]

Craig-That sounds like it was a good set-up minus the joints. There are not too many out there. kerneltugboat- Thanks for the prospective. Your project is going to payoff huge dividends. I am looking forward to hearing about the Labor Day splash! I checked into the Steyr 256 - (Nestor's recommendation), but Inmar Marine only puts those on ski boats?! The Albe 242 is the big diesel/jackshaft producer with a similar size and older hull. They use the D-4 260 with the duoprop outdrive. The Silverhawk should have that set-up.

[cc]

I have a Seacraft, but also a TrueWorld Marine 288 (28'8" x 9'3" wide) with a Yanmar 315 hp turbo diesel mounted amidship jackshafted to a Bravo3X Merc outdrive. I turn 22" pitch props, carry 130 gallons of diesel, have an honest 450 to 500 mile range, cruise at 28 to 30 mph with a top end of 40mph. Not too bad for a boat that weighs close to 9500 pounds fully loaded. Yanmar offers this package for repowers, and I believe it is around your price range. I can't say enough nice things about this setup. Runs offshore or shallow. Not worried about blowing up either.

[Snookerd]

CC-that True World Marine 28 is a sweet ride. those are some incredible #'s . What kind of maintenence costs do have annually? That Yanmar is a beast.

[Snookerd]

I checked with Silver Hawk on-line for the diesel jackshaft option, they have one with no price quoted. They are in the 115K area with their top packages . they cameout with another version of a stretched SC23 @26 feet this year.

[Old'sCool]

I checked with Silver Hawk on-line for the diesel jackshaft option, they have one with no price quoted. They are in the 115K area with their top packages . they cameout with another version of a stretched SC23 @26 feet this year.

Isn't the Albin the same??