Inboard Diesel Jackshafted Vs. Twins on a Seamark

[Snookerd]

it should the same basic 26 between 2 different companies. I bet they are very differently rigged though. I read a thread on THT that had one of the owners of Silverhawk say that he had never seen the Albin 26 which has been out for a while?!

[EBEACH]

kerneltugboat,

I agree the D3 looks like a nice small package, but do you think it would really move the boat that well? Largest motor is 190hp.

I saw this engine package a few months ago, but didn't give it much consideration because of the HP rating. Should I reconsider?

Thanks, Jim

[PipeDreamsMarine]

Just a note on the Silverhawk. I live right down the street from the Silverhawk Plant. In fact I supply Silverhawk with all of their T-tops and rails. The 26 isn't a stretched 24, it started out that way but they trashed the idea and started over. The boat will be a 28ft with a new shear line and higher free board to balance it out. Outboards on a bracket will be on the first one. I'm not sure about an I/O version. Look for the 28 at the AC in water show in Sept.

As far as the I/O version of the 24. The 24 with the 383 Mercruiser Stroker motor runs a solid 53mph on the GPS full of fuel and 2 guys. It is the Bravo 3 drive so, the boat has alot of balls. There has been some talk of doing a jack shaft version in the future.

[cc]

The boat has a closed cooling system (fresh water cooled), so all I have had to do is run pink antifreeze thru the intake, change the zinc anodes, the oil, filters and wash the air filter. Less than 200 bucks per year. I have a floscan on the boat so I know the fuel burn numbers are right (plus I check it on fill ups before resetting). Speed is by GPS (Furuno Navnet). I repowered another boat I own 3 years ago with a 5.7l bravo1 set up for about 15k. It burned about 10 to 12 gph at cruise (25mph). Haven't used it but a couple of times since I got the TWM with the Yanmar.

[Bushwacker]

cc - I recently read an article by Dave Pascoe on yachtsurvey.com that Yanmar used to use a heat exchanger with brass tubes in an aluminum casting. Do you know if they have changed that set up to eliminate the potential galvanic corrosion problems?

[Snookerd]

it looks like the prices of a used diesel boat make a good argument for a "take out" and install in my boat, then swap with a gas motor, then resell the donor boat. any thoughts??

[kerneltugboat]

Jim,

I think it would, just by reading several articles on boats with Similar weight in inboard form. If you go to VP's Website they have a repower configurator and I put in a weight of 4500 lbs at 23 ft and it calculates 34.5 Knots Top End with the D3-190 with the duoprop, so I figured 30 Knots may be realistic, but it may do more. My boat should be around 36-38 Knots top end I should cruise at 30 Knots under 10 GPH, I am hoping to get closer to the True World Fuel numbers at 22-25 knots. You can also see the Fuel burn charts and it looks like the D3 would burn 5 GPH at 3250 RPM, wich I figure should be pushing it between 23-25 knots. We will not really know until someone puts one in a 23, but I think it would be an awesome ride. Also, the True World Marine 28' boats were the inspiration to do what I did with mine. I went with VP because my local mechanic was a dealer and I wanted one company to deal with if I had an issue, but the Yanmar engine and Mercruiser drives are great as well. The only downside to the D3 would be it is all aluminum as opposed to my Cast Iron D6, but for normal use it should be fine. I think the D4 is a little too heavy for a 23 (1400lbs) vs the 720 of the D3. I also considered the Steyr, at 250 HP, it is very light as well and may work in the 23 mated to a Bravo I Diesel drive, but I stuck with VP. I will let you know how it goes in a few weeks.

Dan

[Snookerd]

I think the D4 is a little too heavy for a 23 (1400lbs) vs the 720 of the D3. I also considered the Steyr, at 250 HP, it is very light as well and may work in the 23 mated to a Bravo I Diesel drive, but I stuck with VP. I will let you know how it goes in a few weeks.

Dan

Dan-Your right the D-4 would be too heavy @ 1400 lbs. Jim- for VP, I agree with Dan on the D-3. It would be the one to go with. The performance and fuel #'s are solid on these motors. Anyone know the motor and weight of the original Diesel installed in the 23 back in the 70's? I am checking on the Yanmar and Steyr for weight/price.

[cc]

bushwacker: I am not sure about the heat exchanger, I will check and post. I am almost sure it is not aluminum/brass. I think it may be monel.

[Snookerd]

I spoke with a a local shop in Bradenton that is a Steyr Dealer. I am getting a quote tomorrow on the 256. It sounds like the dealer network here in SW FLA is building up over the last year.