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Just picked up a 28FB with 4lh-dt 190 hp looking for prop size running yanmar 4lh with 2.07 /1 gear box . I know these motor are a little low on HP but there not to many Diesel out there for sale. With a fresh clean bottom and running gear @2900 rpm I get 16k can run fully loaded 3450 rpm no problem I was hoping for a little bit more speed if all possible with out hurting the motors . Current props are 19x22 3 blade DJ style #5 cup. Any ideas will help.

I am running 150hp cummins 4BTs. I cruise at 17knots easy and WOT 23 knots. I am running 17X17 with 1.5:1 gears.

You should be able to do better than those numbers

also you nd to get a little more than your rated rpm @ WOT and that will be what shes got