hogie roll

Air can’t move freely around the crankcase as the pistons go up and down. I believe some LS engines are “windowed” for this reason.

It also ends up being narrower near the crank than if you had a big kick out pan. So you could be splashing the crank in oil unless the pan is much deeper.

hogie roll

3.8L+ Whipples can make more HP on pump gas than any 8/71. Billy boats gave up 10/71s when they couldn’t make more than 1100 on pump gas. Ended up with 4.0L whipples and the fastest poker run/pleasure V bottom ever. I think the high score he set was on higher octane though.

hogie roll

They are designed that way for structural rigidity.

I remember seeing that aluminum aftermarket sbc or BBC blocks always gave up power to iron ones.

Maybe the OEMs deep skirted the factory aluminum blocks to fix this?

boostbros

this is whats becoming available now making the ls base obsolete, there are many engine guys building billet blocks allowing new wild combos how about this bigblock 960ci with hemi heads? and check out the cam size!

LakeBoat4

Those Sunny Engines are just big and beautiful. Totally getting off track here but way Cool. I looked at them before doing the LS. How much is enough for Power?
The factor there is who is going to work on those engines that has experience with them, No one. There is a base of Tech's to work on the LS at least it has been in production for years in stock form.

On another note: I have a predecessor to the Sunny engine. The builder tried to make a go of a Great New from scratch design. They Sold 12 of these engine and they had issues. The only way to get service was to have a factory Tech fly out to address anything. These were designed as marine engines to begin with with high hopes. The reason I got them is they are way to Cool and Super Rare. They were in a Cig, Rough Rider that could not be sold with them as power. I put one in something, one of maybe 3 that can still fired up and run. What do you think it's in? One was going in the 28 Cat but the Wife said no way so the LS was built.. Not hard to figure where the one went but Crazy just the same. It is what I do. The photos are out of the boat and the other is ready for the install. A lot of work in between.

Back to support, there are options for work of art engines but not many boaters can even change the oil, spark plugs or forbid do a valve adjustment anymore. There has to be service support and parts availability.

No matter what the cost of an engine keeping it running is a big issue.

Wally

Is'nt that the Torque V-12?

Twin O/B Sonic

How is torque of an LS at lower R’s, where a boat spends most of its time, compared to the BBC?

Wildman_grafix

NA to NA BBC wins.

I was looking in the 500-600 range, a SC on the LS/LT motor compared to NA BBC.

My question does the newer tech SC LT4 based last longer than a NA BBC. Is the direct injection a lower fuel burn? Can you not have to do top ends at 400ish hours.

I did some curves using my HP500EFI motors, a buddy 525EFI motors and what Kodiac has on the site for the LT4.
Of course the Kodiac curve doesn't give correct factors or anything so it may be this may not.
https://www.kemequipment.com/marine-...#product-title

Our motors where full dress, sea water pumps, alternators, power steering exhaust everything on it as it is in the boat.

hogie roll

Id love to know how fast a boat with Sonny’s Chemis would be. Never seen one.

LakeBoat4

Yes these are Torque Engineering V-12's. NA and torque monsters. Back in 2000 1150hp/1150tq on 91. That is whole other topic.

Of course NA to NA, LS vs BBC. The bigger engine will have more torque with less effort. Everything these days is supercharged or turbocharged. Mercury has 1100hp on up turbocharged, the Verado 350 was supercharged for years now back to NA big displacement with 4 more cylinders.

I can say that most all dyno charts start recording at 3500rpm. Even the one for 525's just posted. My LS has 1070 ft/lbs at 3600rpm. Even if it was half that at 1500rpm it would be more than a 525's max torque. What is in question? Is there some issue that is out there that forced induction is taboo or puts more wear on an engine. Guess turbo diesels can't go 1,000,000 miles before rebuild or like 8-10,000 hours in a boat or heavy equipment.

It depends on how the engine is run that determined the top end refresh. I dont know of any engine in even the 5-600hp range that can go 400 hours not even Mercury. Ever the Mercury 525 is recommended for a top end refresh at 200 hours.

If the BBC has such a following that is fine. I just wanted to show there is a newer alternative and is going to grow in popularity with New Tech. It may not be this year or next but it is the way of the future for I/O's. The big demand is for Outboards these days with New Technology. Seems the bigger the better and there is a waiting list. There is a fraction of I/O compared to Outboard boats being built in the last 5 years. What is the reason for that?