Mercruiser 220 mpi repower

K

Kinkchaser

New member
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.
 
Make sure you have the correct t outdrive ratio. Should be 1.84( or close to that number). You can crutch the issue with lower pitch props,but it will run better with the correct t ratio. Has the engine been checked by a knowledgeable tech? Does it have cat exhaust? New engine or uses? You have bottom paint?
 
This question is for Spareparts, I have a 15x17 3 blade prop and is perfect for my 150 mercury outboard. What would it be if I put on a 4 blade prop? Same pitch and diameter. . What is the difference
 
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