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I am sorry to say but no, you are not right. I build the hull's myself and we have 23ft boats with twin outboards on a hydraulic lift on the back, this is 500kg on the back (outside the boat). When I builded the boat, I builded for inboard diesel, with all the structural strenght and flotation...

I want to increase speed to lower the torque. Years ago we had yanmar 350HP on bravo drives and I never saw one holding together longer then 30 hours. The bravo's can handle power and RPM, not torque

You guys are right, any leads on gearboxes? thanks, Raf

I want to use a cummins 12V 5,9 diesel engine to replace a blown chevy 540 BB. the diesel engine puts out 500 HP at 3000rpm with 945lbs at 2000 rmp. If I would use a speed increaser gearbox of 1 to 2, I convert this to 1000HP at 6000 and 472ft lbs at 4000 wich actually lies close to my BB...

I am a high perfomance boat builder in Europe. With our feul prices we have tons of clients who are asking us for dieselpower. We want to use a bravo style drive, because almost every boat is equiped with this style of drive. The known problem is that these drive cannot handle the massive torque...

www.dbdmarine.com have a nice drive, same principle