Inboard Diesel Jackshafted Vs. Twins on a Seamark

[ScottM]

Anyone know the motor and weight of the original Diesel installed in the 23 back in the 70's?

I believe they ran the Volvo TMD40 @ 165hp.

[Snookerd]

Thanks Scott. I am finding 1150 lbs. as the original weight of that Volvo motor. Diesels inboards are getting lighter and gas outboards have gotten heavier . The Styer 256 is around 700 lbs putting out 250 hp!

[glow]

Check out the pics I posted of the "Hawaiian" SeaCraft. As mentioned the hull is stretched to 26' and has a volvo AD41B 200 hP diesel in it. The boat is fast with the direct drive (low 30 knot range) and burns about 2 gph at trolling speed. They are much faster with the VP Douprop (mid to high 30 knot range). That may be attributed to the back end being flattened out vs. the original deep v of your classic. Most seasoned fishermen in Hawaii run diesel power (unless the boat is too small or they can't afford it) in their Classic SeaCrafts or 24' and 26' Yellowfins (modified SeaCraft hull). The first boats like my dad's were a bit heavier than the newer ones as they used a good amount of wood in the construction. My dad's boat was filled with seven Ahi from 110 lbs. up to 170 lbs. (Hawaiian name for Allison Tuna), over 700 lbs. of ice alone + brine, a crew of 3 weighing 140 lbs., 165 lbs. and 220 lbs. Plus all the rest of our gear (we fish 5 Penn 130's). They came back in 15-20 ft. seas on the windward side of Oahu and the engine still had more throttle. Weather conditions didn't allow my dad to use more power and the motor was over 10 yrs. old. Hope this helps you decide and if you have anything you'd like to ask in specific give me a holler. Aloha, Greg

[kerneltugboat]

Snookered,

I really like the Steyr, you may wan't to confirm one thing, I think it has Electronically controlled manual injection, just like my 6.5l Suburban, at the time they were not promoting common rail fuel injection. The common rail is supposed to be quieter and better on fuel. This was a few years ago, so they may have it now. Another thing I thought might be interesting is to jackshaft an I/O to a Inboard Seacraft with the pocket. I did notice when Albin went to I/O on their inboard diesel, they got rid of the pocket. I wonder if they tried it, or just figured they better enclose the pocket. I think it could be done, the motor would be higher, but the driveshaft should still clear the floor, although it would be close. It is a lot of work to do it and find out it don't work !!!! I think that is why it has not been done !!!

[ScottM]

Another thing I thought might be interesting is to jackshaft an I/O to a Inboard Seacraft with the pocket. I did notice when Albin went to I/O on their inboard diesel, they got rid of the pocket. I wonder if they tried it, or just figured they better enclose the pocket.

I would think if the pocket was left in place and an I/O bolted to the transom, there wouldn't be enough clean water for the prop to bite into, causing a lot of cavitation/slippage.

[Snookerd]

Most seasoned fishermen in Hawaii run diesel power (unless the boat is too small or they can't afford it) in their Classic SeaCrafts or 24' and 26' Yellowfins (modified SeaCraft hull). Aloha, Greg

Greg- Thanks for the details of your ride. Very cool modifications to consider as a strectched 23. Kerneltugboat-Thanks for the Steyr update on fuel delivery info. I got my quote on Friday and I am in sticker-shock . I am getting quotes of $26K for the 256 Steyr and VP outdrive. The quote is before shipping from Austria, and install. I am certain that Nestor's Steyr dealer quoted around $17K for the motor last year. The 26K is no-where close.

[Snookerd]

The twins on a Seamark look good right around now . The Yanmar is better priced than the Steyr from what I have heard.

[glow]

Snookerd, Thanks. You may want to look into a Cummins 210 hP. I think its referred to as the BT210. It's an older style mechanical injected motor. We were quoted about $12,800 + the cost of the gear (another $1k approx) to run a jackshsft set up in addition to the cost of a Bravo 3 outdrive. The motor is very reliable and parts availabililty is plentiful as the salesman told us the same block is used in heavy equipment and commercial trucks. The motor is rated medium duty vs. the old VP 200 and 235 hP motors being rated as light duty. I heard from a VP dealer on the East coast that VP stopped producing the mechanical motors because they can't get decent cores to rebuild the parts. Also, my local Cummins dealer told me the electronically controlled motors have to go into any boat commissioned from I believe 2005 (or something like that) in order to meet EPA regs. Any boat built before that being repowered can use the mechanical system.

The new electronically controlled motors are SWEET though ... I heard they are just as quiet as a 4 stroke outboard. Most fishermen in Hawaii are so used to the cast iron inline 6 format and mechanical injection that they are weary of the 4 cyl. aluminum blocks and electronic bugs that the new systems may have since they are 1st Gen. Take it easy and regardless of powerplant you defintely have an AWESOME fishing machine (SeaCraft ofcourse!). Aloha, Greg

[countshock]

guys, I ran oldport launches for like 8 years, and they all had small yanmars in them, 70-80 hp range, and we would put about 2000 hours on them a season with little to no maint. Those things were/are bulletproof.

[Fr. Frank]

there's a 25' Steiger around Homosassa with twin VP diesel sterndrives. I've been told by a third part that they're 140 hp models. I don't have any other info.