454 mercruiser mpi with big cam and rollers need a prop
06-25-2019 | 12:11 PM
#12
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Joined: May 2007
Posts: 85
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I have a 99 Baja 232 with stock 502 Mag MPI - 415HP
25p Mirage Plus has been the best prop for me. Stock it turned 68-70 mph at 4800rpm.
After labbing - 72-74 mph at 5000-5050rpm. 74mph needs to be perfect conditions.
Above 68mph the hull chines badly - need tabs to settle it and push past 70, but still needs alot of correction to track straight.
Labbed Rev 4 25P was worse at chine, with no gain in speed.
So depending on the 454 build, I would suggest that a Mirage 23P would be ideal, maybe a 25P if you have the power to push it.
Avoid 4 blades, too much stern lift for that hull.
I'm no prop expert, just notes from my experience with the same hull.
25p Mirage Plus has been the best prop for me. Stock it turned 68-70 mph at 4800rpm.
After labbing - 72-74 mph at 5000-5050rpm. 74mph needs to be perfect conditions.
Above 68mph the hull chines badly - need tabs to settle it and push past 70, but still needs alot of correction to track straight.
Labbed Rev 4 25P was worse at chine, with no gain in speed.
So depending on the 454 build, I would suggest that a Mirage 23P would be ideal, maybe a 25P if you have the power to push it.
Avoid 4 blades, too much stern lift for that hull.
I'm no prop expert, just notes from my experience with the same hull.
