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This is the 2nd 220hp MPI Mercruiser I had boat repowered. Last one was 2004. That setup with 3 blade prop same diameter and pitch was about 23.5kn. Installer said I was getting the correct rpm’s. One technician mentioned if I go up to a 17x19, I’ll give up top end but midrange should be...

Just repowered my 1990 v20 with Mercruiser I/O 220hp MPI. Only getting 22.5 knots at 3600 rpms with a 15x17 4 bladed aluminum prop. Any thoughts what my cruise speed should be? With 220hp, should be doing better than 22-23 knot cruise in my opinion.