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What size prop on a SS 201 I/O?

Hi, I bought a 2012 leftover SS 201 I/O with a 220hp Mercruiser with an Alpha 1 Drive and it came with a 3 blade 14.25 x 23 inch pitch aluminum prop.

According to the dealer's test technician, he tested it at 52 mpi @ 4800 WOT.  However, when I got the boat and broke her in, the best I could do was 45 (GPS) MPI @ 4400rpm!!  I was not only somewhat confused but disappointed.  Either the technician was lying or something happened in transportation to the boat which was less likely.

I borrowed a 14 x 21 aluminum prop and was able to hit 5000 RPM and about 44MPH in rough and windy lake water while the 23 pitch could do only about 41 or 42.

I am thinking about putting a 14 x 22 inch pitch stainless steel cupped prop on and would like to get your comments, which would be welcomed.


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