A 502 big block is a marine engine and it is availible today. So, I disagree with you.

Mutt:

SBC 5.7: Bore: 4.00 Stroke: 3.48

Toyota 5.7: Bore: 3.7 Stroke: 4.02

I don't consider those numbers related.

Toyota marine engines?

Funny we should mention the CVT though... How much different would a VVT/CVT setup be, from say a VVT marine engine with a CVT sterndrive?

According to my knowledge and understanding...it would not be worth the development or production expense. I'm not convinced it could improve performance.

The answer is already on the table. It's successful in the OB world. Give the stern drive world another 10 years and they'll catch up.

BTW, take that last line with light thought and a deep breath. It's suppose to be funny.

As for Seabuddy's original question/proposition/whatever it was.

This is a new style marine I/O engine. Are we not allowed to discuss spreading/adopting the technology in other size/power segments.

Admin created a land based form for some of that here...

Vehicles of Conveyence other than Watercraft

Note, there are many new folks on the board that can get confused by off topic issues, IMO.

With all due respects...do you think a new-bee is going to be looking at a 550hp high dollar, high performance machine or a more modest, more common boat/engine?

Not trying to argue. Just wondering why venturing into more common land is "off topic" when it could bring the subject on-topic for a large portion of visitors.

Its also easy to start a new thread if new tech car stuff is the point of a marine engine discussion that focuses on that, I would think.

Back on topic.

A smaller package with the performance of a larger package. Costs are ballpark close.

-----What else do we need to discuss?

You want a big block replacement in a small package, see below.

This little V6 engine, while not "marinized", but just as you see it, once it was installed into the Grand National sitting next to it and connected to a very good intercooler, I believe dyno'd at over 700 hp and nearly 800 ft.lbs. torque. (car runs 9's at well into the 130's in the 1/4). No 'radical' enginnering, just solid, proven technology like good breathing heads, strong block, big turbo, big exhaust...It's idles smoothly, and is street-driveable. It doesn't weigh all that much, and cost way less to build than $800 per horse. Honestly, I'm still baffled why nobody's built one of these for a boat! (at least that I know about!)

Putting a turbo in a boat isn't cheap, nor is it easy. Supercharged engines, especially in small displacements cranking a lot of power, generate a lot of heat. That's another expensive problem to engineer from more than a packing standpoint, but internal stress/weaknesses associated with long runs. Third, turbo lag isn't "cool" in the standard boat. Forth...there have been V8 blocks sitting and ready for many years. Why reengineer something that already has a cheaper and equal solution.

Times have changed. I'll give you that. Merc has proved superchargers can work in the marine world. Look at the Verado's. Expensive but powerful.

Please notice how strong the block/internals are in the Verado. And superchargers can do the same thing as a turbo in a boat engine, IMHO.

I'm not sure it's "smart" to develop the approach though. Tough times in the marine world. They don't look to grow brighter in the near future. I think adapting current technology is cheaper and therefore smarter.

As for this 550hp engine...GM didn't stick a super or turbo charger on it for a reason. Plus. 500hp? What more is needed? Sheeze.

I think the technology discussions need to be focused in the 8.1 market. Those blocks are history soon!

I have become very good friends in the last couple of years with a local GFBL engine builder. He may be the only one in the area that will actually remove, rebuild (or build-up, or both!), dyno (and tune), reinstall, and take the boat on the water for a final tune.

He is adament that to make big power that the GFBL crowd yearns, huge cubic inches (600 cu in +) and a super charger is the only way to fly. He routinely builds 1000HP plus HBBC (H=HUGE) engines, for a lot less than the 434 that is this thread's topic.

I don't know if there is a real market for an over-priced SBC.

FR, turbos are not designed for extended WOT use that boats demand.

I'm try trying to argue with an expert.

CNY: Will you explain why diesels with turbos can run WOT for hours on end?

Remember: I agree turbo chargers are not a good idea in boat!

Nope. I'll guess, though, that it's because diesel engines run so much cooler.