27 Flybridge conversion from I/O to Outboard

[3rdday]

7 marine I am fa,Iliad with it a friend of mine who used to work at lake x and one of the foremost racing outdrive experts had a hand in the drive unit. He does drives that handle 1200+ hp

[McGillicuddy]

Brian,
I like to fish cheap for as long as I can, so I like the idea (sorry I'm getting so technical here...)

I've never seen a performance bulletin on the 27 so i really don't have a clue as to the weight involved. I don't recall a rebuild thread on your 27 so not sure if you cut some weight with current composites. I think the 300 e-tec could get you near 35 mph with a big ole SeaCraft friendly 15p prop and it will likely double your economy at cruise over the 454/Bravo and untold gains in the manatee zones

Etec DIs at idle and low speed troll kick a$$ on efficiency so I'm not sure I'll bite on the 4s vs 2s argument any more. Nominal at best with modern DI at play.

Less weight, less drag, cleaner water for prop = better perf.
Might consider a big bracket on that will accommodate twins in case you are unsatisfied with performance, but overall, I like the idea.

Side note - what did you repower the 21 with?

[Bushwacker]

Brian,

Here's a thread on the E-Tec Owners forum you might want to check out. http://www.etecownersgroup.com/post/...03692?trail=15 This owner had a 300 on a big 30' aluminum boat, and he's a mechanical engineer, so you might join the forum and send him a PM. I'm sure he know the weight of that rig and how much load he was carrying. You might want to pose the same questions to that Forum also, as it's excellent, similar to CSC in the wealth of knowledge there and friendly folks willing to help any way they can.

Skip and DonV said the Sea Mistress had PLENTY of power with the twin 250 HPDI's on a bracket, even though Carl said they were mounted way too close together, as most twins are on the SeaCraft hulls. He always mounted the twins in the center of the center panels on his race boats to get them in the cleanest water. You won't be nearly as fast with a single 300, but you'll only be feeding about half as many cubic inches as that 454, so I'd think fuel economy would be fairly decent, especially when you lose that much weight!

What sort of bracket did you get? You might want to consider a jack plate, because I don't think you'll have to worry about stern weight, but getting the engine height correct will make a big difference in performance. The AV plate wants to be out of the water. I'm still at least an inch too low even after Don redrilled the motor mounting holes to raise them an inch, with bolts in the bottom holes on motor bracket. Denny

[3rdday]

Way Cool Denny thanks for the G2.
The Thought Had crossed my mind,I had already been shopping for Jack Plates.
I have A large Dusky Bracket with big flotation, Guess What???? It fits in the pocket on the transom perfectly and at the anticipated correct height!!!!!!I got the bracket for $200
Looking for hydraulic steering now, and the DI old V8 Evinrudes I am intrigued...

BTW Everyone that 7Marine 575 hp engine is 70-80k

AND- DID YOU SEE THE TURBO DIESEL OUTBOARD?????

Originally Posted by Bushwacker

Brian,

Here's a thread on the E-Tec Owners forum you might want to check out. http://www.etecownersgroup.com/post/...03692?trail=15 This owner had a 300 on a big 30' aluminum boat, and he's a mechanical engineer, so you might join the forum and send him a PM. I'm sure he know the weight of that rig and how much load he was carrying. You might want to pose the same questions to that Forum also, as it's excellent, similar to CSC in the wealth of knowledge there and friendly folks willing to help any way they can.

Skip and DonV said the Sea Mistress had PLENTY of power with the twin 250 HPDI's on a bracket, even though Carl said they were mounted way too close together, as most twins are on the SeaCraft hulls. He always mounted the twins in the center of the center panels on his race boats to get them in the cleanest water. You won't be nearly as fast with a single 300, but you'll only be feeding about half as many cubic inches as that 454, so I'd think fuel economy would be fairly decent, especially when you lose that much weight!

What sort of bracket did you get? You might want to consider a jack plate, because I don't think you'll have to worry about stern weight, but getting the engine height correct will make a big difference in performance. The AV plate wants to be out of the water. I'm still at least an inch too low even after Don redrilled the motor mounting holes to raise them an inch, with bolts in the bottom holes on motor bracket. Denny

[Fr. Frank]

MEG outboards (maritime engineering group) is nearly bankrupt and looking for investors or for a buyer. A friend of mine at Pro-Line says they've run through the Federal wringer, when they should have received their manufacturing and EPA permits 3 years ago. He said they have spent something like 14 million in development, and 12 million in Federal inspection and testing costs and fees. Under the previous administration they were told they were just "a few weeks" from receiving their final approval to begin planning production, but under the current one everything was stopped in its tracks.

That information is 3rd hand, but is also disturbing.

[DonV]

I'm thinking they were too busy giving away ga-zillions to Solyndra and other "green" projects to worry about the marine industry. I had better stop.......

[DonV]

Naw on the Etec, you gotta get one of these 557 hp monsters. seven-marine.com

Heck any "outboard" with a transmission NOT in the lower unit and can swing an 18" prop is what ya have to have for the 27. Shoot, I'm thinking way into the 50 mph range with one of these. Don't worry about the initial cost, it's only money. 2012 technology on a 1967 SeaCraft....that's cool.