23 septre i.o.prop size info

[BigLew]

IT is funny this topic should come up. If I've got the same question and the same configuration. I've held off a asking the question because I plan to repower soon, and will likely try and put in a 350 CID Vortex putting out 310-325 horsepower.

One thing not mentioned previously is that some of these boats have tanks holding as much as 145 gallons (mine for example). That is nearly 900 pounds of fuel. Also, in my case, the aluminum prop is cupped. However, I believe mine has reached 4000-4100 RPM. The above mentioned target WOT RPM range is accurate though.

As I said, I will be a REAL interested in the results of this.

[BigLew]

Fr. Frank,

Where are you when we need you? Please bless us with your encyclopedic knowledge of all things having to do with marine power.

Bless you brother!

[1bayouboy]

My sentiments exactly of Fr Frank....

I can tell you his usual is max should be max at max....

Meaning your max rpm should hit the max end of the range when you boat is max loaded out. I propped mine accordingly and could over rev it when lightly loaded if I tried or come very close. The max rpm on the 350MAG Horizon is an insane 5200rpms. The only time I come close is a brief WOT run every other time out.