Offshoreonly.com - 665 inch BBC for LaveyCraft NuEra29 build

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How bout a tq splitter gear box and a pair of alphas lol... it will save you some money...

Why not an ssm 8? Thats mercs biggest baddest drive til the 10 comes out

Yes with the Merc twin shafts for the current 6 and up. Cost is not cheap either. I understand the SC lower is not that strong either. If I recall I think the Merc 6 is rated up to 1100 hp and a full SCX what is 900 or 1000 hp ? I know its 900 hp max or 1000 hp max if I recall correctly for a full SCX.

Quote:

Originally Posted by BUP (Post 4501584)

I think the rating is only as good as, well, who's giving the rating. lol.

I'm not to up to speed on the scx/sc lower combo as far as long term reliability with a torque engine package in a big single. It might hold up, my gut says probably not though.

900ft lb stump puller build, in a big single engine hull, prob gonna be tough on the gears. imco states MAXIMUM idle speed to be 800RPM for the scx. The drive holds 4.5 quarts of lube. A wet sump #6, held 20 quarts. A SSM V, held about 8 quarts, and an old 3A, about 10 quarts.

I would like to see a pair of bravo lowers mounted to a #6 upper. Would not be that hard to do. Ask Tyson be a walk in the park for him. Big silver cat.

Great thread thanks for sharing!

Sounds like you will easily achieve your power and reliability goals!

Quote:

Originally Posted by BUP (Post 4501584)

But those ratings im sure are for a 4 1/4 stroke blower motor or similar a 5" stroker is gonna make tq off idle like a 1500hp engine or a diesel lol.

Like the guy stated earlier a little too much fuel getting on plane and boom.

Why arent u looking at the ssm8?

Quote:

Originally Posted by 14 apache (Post 4501595)

I would like to see a pair of bravo lowers mounted to a #6 upper. Would not be that hard to do. Ask Tyson be a walk in the park for him. Big silver cat.

You talking about a single six upper transerring power to a pair lf bravo lowers?

What about the x power drive? I know someone on here just bought a cat with those but haven't heard much. This boat is to be a trailblazer of sorts, so why not if starting from scratch.

Always easier helping others spend their money. :D
great build and thanks for sharing.

Quote:

Originally Posted by MILD THUNDER (Post 4501570)

I think someone was blowing smoke your way. The big benefit of a SSM 6, is having dual vertical shafts, with dual gearsets in the lower. Properly setup, each gear and shaft, has to withstand 50% of the torque load. Not 100%. Benefit? You can run smaller diameter gears, and a more efficient lower case. The uppers gears and shafts are plenty big to handle the power. Its a design thats been around for several decades now, and race proven. It was used in the SSM 3,4,5,6, and now 8. Mercury never had a cone clutched drive that successfully handled power that you will be making.

Personally, I think you'll be chunking those standard SC lower gears, especially if you run hard in anything other than flat water. Either way, awesome build, looking forward to the results.

I had an SC on my boat , about 850HP , I went through 2 rebuilds before I went to an SCX . I researched the SCX/SC lower combo and I found that the SC lower was now the weak link . I'm now going on 3 seasons , spinning a Maximus 5 blade with no issues ...lost a little top end though .

Quote:

Originally Posted by iliveonanisland (Post 4501620)

You talking about a single six upper transerring power to a pair lf bravo lowers?

Yes