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Old 07-26-2019, 02:42 PM   #15
Comodave
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City: Au Gres, MI
Country: US
Vessel Name: Never Say Never
Vessel Model: President 41 DC
Join Date: Jul 2015
Posts: 5,013
If memory serves me, the B2 drive has a larger lower gearcase so it can handle the larger load from the bigger prop. With a large heavy boat you need the larger prop to transfer the power to the water. And the larger gears to handle the load. Merc tried using a big block in the late 80s or early 90s with an Alpha 1 drive. It worked ok with a light fast boat but then Searay put it in some cruisers in order to keep the price down. The smaller gears could not handle the torque of the big block and would fail usually while trying to get onto plane.
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